一种耐热铸造铝合金及其制备方法

Heat-resistant cast aluminum alloy and preparation method thereof

文档序号：3514 发布日期：2021-09-17 浏览：44次中文

1. The heat-resistant cast aluminum alloy is characterized by comprising, by weight, Cu5-25 parts of Cu, Mn0.5-2 parts of Mn, 2-4 parts of modified calcium carbonate, 2-3 parts of modified ferrous sulfate and 0.001-1 part of Pt0, and the balance of Al and inevitable impurities.

2. The heat-resistant cast aluminum alloy according to claim 1, wherein the aluminum alloy consists of Al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate, and Pt in the weight percentage composition of Cu8-21 parts, Mn0.8-1.4 parts, modified calcium carbonate 3 parts, modified ferrous sulfate 3 parts, and Pt0.5 parts, and the balance of Al and unavoidable impurities.

3. The heat-resistant cast aluminum alloy according to claim 1, wherein the aluminum alloy consists of Al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate, and Pt in the weight percentage composition of Cu9 parts, Mn1.1 parts, 3 parts of modified calcium carbonate, 3 parts of modified ferrous sulfate, and Pt0.5 parts, and the balance of Al and unavoidable impurities.

4. The heat-resistant cast aluminum alloy according to claim 1, wherein the modified calcium carbonate is produced by a method comprising the steps of:

firstly, mixing calcium carbonate and distilled water according to the proportion of 1:10-15, and adjusting the pH value to 5-6 for later use; adding sucrose into the calcium carbonate solution, and reacting at 50-60 ℃ for 1.5-3.5h to obtain calcium carbonate-sucrose mixed solution; and then putting the calcium carbonate and sucrose mixed solution into a high-speed stirrer, adding glycerol, stirring at an accelerated speed until the calcium carbonate and the sucrose mixed solution are completely mixed, and mixing molybdenum nitrate, manganese nitrate, nickel nitrate and ruthenium nitrate according to a weight ratio of 60-100: 5-20: 10-30: 10-30 ℃, synthesizing a calcium-titanium mineral substance at 350-600 ℃, dispersing and mixing the calcium-titanium mineral substance and the secondary modified calcium carbonate through airflow, finally performing microwave treatment, heating at 180 ℃ for 15min, standing and cooling to obtain the modified calcium carbonate.

5. The heat-resistant cast aluminum alloy according to claim 1, wherein the method for producing modified ferrous sulfate comprises the steps of:

s1: taking ferrous sulfate and polyethylene octene co-elastomer according to parts by weight, cleaning and crushing to prepare powder;

s2: placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen;

s3: placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C;

s4: adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of the first zone is 190 ℃, the temperature of the second zone is 210 ℃, the temperature of the third zone is 230 ℃, the temperature of the fourth zone is 210 ℃, the temperature of the fifth zone is 215 ℃, the temperature of the sixth zone is 225 ℃, the temperature of the seventh zone is 235 ℃, the temperature of the eighth zone is 240 ℃, and the rotating speed of the main engine is 320 revolutions per minute;

s5: and cooling and drawing the strips after extrusion, and air-drying and granulating to prepare the modified ferrous sulfate.

6. The heat-resistant cast aluminum alloy according to claim 5, wherein the antioxidant is compounded by a phosphite antioxidant and a hindered phenol antioxidant in a ratio of 2: 5;

and/or the corrosion inhibitor is one or more of dodecyl bis hydroxyethyl methyl ammonium chloride, urea, thiourea, rhodine and benzotriazole.

7. The heat resistant cast aluminum alloy of claim 6, wherein the plasticizer is one or more of dioctyl phthalate, dibutyl phthalate, dinonyl phthalate, or dioctyl terephthalate;

and/or the foaming agent is one or more of lauryl sodium sulfate (K12), fatty alcohol-polyoxyethylene ether sodium sulfate (AES), rosin soap foaming agent and animal and vegetable protein foaming agent.

8. A method of producing the heat-resistant cast aluminum alloy according to claim 1, comprising the steps of:

s1, preparing modified calcium carbonate;

s2, preparing modified ferrous sulfate;

s3, taking raw materials, wherein the raw materials comprise: al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate and Pt;

s4, removing oxide scales on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃;

s5, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas;

s6, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal;

s7, cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing argon gas for 30S for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Background

The heat-resistant cast aluminum alloy has high-temperature endurance strength, creep resistance and good structure thermal stability, and in the cast aluminum alloy, copper can not only improve the thermal stability of solid solution, but also more importantly, a plurality of high-temperature thermal stable phases, so that the aluminum-copper binary alloy is the basis of the heat-resistant aluminum alloy, the copper content is generally more than 3%, and the industrial heat-resistant cast aluminum alloy system has the following components: aluminum copper nickel series, aluminum copper nickel magnesium series, aluminum copper nickel manganese series, aluminum copper silicon iron series, aluminum silicon copper nickel series, aluminum derived earth copper series, and the like.

But the material of the existing aluminum alloy can not simultaneously improve the hardness, toughness and strength and can not meet the requirements of people.

Disclosure of Invention

The present invention is directed to a heat-resistant cast aluminum alloy and a method for manufacturing the same, which solve the problems of the background art mentioned above.

In order to achieve the purpose, the invention provides the following technical scheme:

a heat-resistant cast aluminum alloy consists of Al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate and Pt, and the aluminum alloy comprises, by weight, Cu5-25 parts, Mn0.5-2 parts, modified calcium carbonate 2-4 parts, modified ferrous sulfate 2-3 parts, and Pt0.001-1 part, and the balance of Al and inevitable impurities.

As a further scheme of the invention: the aluminum alloy consists of Al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate and Pt, and the aluminum alloy comprises, by weight, Cu8-21 parts, Mn0.8-1.4 parts, modified calcium carbonate 3 parts, modified ferrous sulfate 3 parts, and Pt0.5 part, and the balance of Al and inevitable impurities.

As a still further scheme of the invention: the aluminum alloy consists of Al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate and Pt, and the aluminum alloy comprises, by weight, Cu9 parts, Mn1.1 parts, modified calcium carbonate 3 parts, modified ferrous sulfate 3 parts and Pt0.5 part, and the balance of Al and inevitable impurities.

As a still further scheme of the invention: the preparation method of the modified calcium carbonate comprises the following steps:

As a still further scheme of the invention: the preparation method of the modified ferrous sulfate comprises the following steps:

s1: taking ferrous sulfate and polyethylene octene co-elastomer according to parts by weight, cleaning and crushing to prepare powder;

s3: placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C;

s5: and cooling and drawing the strips after extrusion, and air-drying and granulating to prepare the modified ferrous sulfate.

As a still further scheme of the invention: the antioxidant is compounded by a phosphite antioxidant and a hindered phenol antioxidant according to the proportion of 2: 5;

and/or the corrosion inhibitor is one or more of dodecyl bis hydroxyethyl methyl ammonium chloride, urea, thiourea, rhodine and benzotriazole.

As a still further scheme of the invention: the plasticizer is one or more of dioctyl phthalate, dibutyl phthalate, dinonyl phthalate or dioctyl terephthalate;

As a still further scheme of the invention: the preparation method of the heat-resistant cast aluminum alloy comprises the following steps:

s1, preparing modified calcium carbonate;

s2, preparing modified ferrous sulfate;

s3, taking raw materials, wherein the raw materials comprise: al, Cu, Mn, modified calcium carbonate, modified ferrous sulfate and Pt;

s4, removing oxide scales on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃;

Compared with the prior art, the invention has the beneficial effects that:

according to the heat-resistant cast aluminum alloy, the hardness of metal is greatly improved by adding the modified ferrous sulfate, the tensile strength and toughness of the metal are greatly improved by adding the modified calcium carbonate, and the toughness of the metal can be further improved by mixing the modified ferrous sulfate and the modified calcium carbonate.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to specific embodiments.

Example 1

First, a modified calcium carbonate is prepared: mixing calcium carbonate and distilled water according to the proportion of 1:10-15, and adjusting the pH value to 5-6 for later use; adding sucrose into the calcium carbonate solution, and reacting at 50-60 ℃ for 1.5-3.5h to obtain calcium carbonate-sucrose mixed solution; and then putting the calcium carbonate and sucrose mixed solution into a high-speed stirrer, adding glycerol, stirring at an accelerated speed until the calcium carbonate and the sucrose mixed solution are completely mixed, and mixing molybdenum nitrate, manganese nitrate, nickel nitrate and ruthenium nitrate according to a weight ratio of 60-100: 5-20: 10-30: 10-30 ℃, synthesizing a calcium-titanium mineral substance at 350-600 ℃, dispersing and mixing the calcium-titanium mineral substance and the secondary modified calcium carbonate through airflow, finally performing microwave treatment, heating at 180 ℃ for 15min, standing and cooling to obtain modified calcium carbonate; then, modified ferrous sulfate was prepared: taking ferrous sulfate and polyethylene octene co-elastomer according to parts by weight, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu9g, Mn1.1g, modified calcium carbonate 3g, modified ferrous sulfate 3g, Pt0.5g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Example 2

First, a modified calcium carbonate is prepared: mixing calcium carbonate and distilled water according to the proportion of 1:10-15, and adjusting the pH value to 5-6 for later use; adding sucrose into the calcium carbonate solution, and reacting at 50-60 ℃ for 1.5-3.5h to obtain calcium carbonate-sucrose mixed solution; and then putting the calcium carbonate and sucrose mixed solution into a high-speed stirrer, adding glycerol, stirring at an accelerated speed until the calcium carbonate and the sucrose mixed solution are completely mixed, and mixing molybdenum nitrate, manganese nitrate, nickel nitrate and ruthenium nitrate according to a weight ratio of 60-100: 5-20: 10-30: 10-30 ℃, synthesizing a calcium-titanium mineral substance at 350-600 ℃, dispersing and mixing the calcium-titanium mineral substance and the secondary modified calcium carbonate through airflow, finally performing microwave treatment, heating at 180 ℃ for 15min, standing and cooling to obtain modified calcium carbonate; then, modified ferrous sulfate was prepared: taking ferrous sulfate and polyethylene octene co-elastomer according to weight g, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu8g, Mn0.8g, modified calcium carbonate 3g, modified ferrous sulfate 3g, Pt0.5g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Example 3

First, a modified calcium carbonate is prepared: mixing calcium carbonate and distilled water according to the proportion of 1:10-15, and adjusting the pH value to 5-6 for later use; adding sucrose into the calcium carbonate solution, and reacting at 50-60 ℃ for 1.5-3.5h to obtain calcium carbonate-sucrose mixed solution; and then putting the calcium carbonate and sucrose mixed solution into a high-speed stirrer, adding glycerol, stirring at an accelerated speed until the calcium carbonate and the sucrose mixed solution are completely mixed, and mixing molybdenum nitrate, manganese nitrate, nickel nitrate and ruthenium nitrate according to a weight ratio of 60-100: 5-20: 10-30: 10-30 ℃, synthesizing a calcium-titanium mineral substance at 350-600 ℃, dispersing and mixing the calcium-titanium mineral substance and the secondary modified calcium carbonate through airflow, finally performing microwave treatment, heating at 180 ℃ for 15min, standing and cooling to obtain modified calcium carbonate; then, modified ferrous sulfate was prepared: taking ferrous sulfate and polyethylene octene co-elastomer according to weight g, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu21g, Mn1.4g, modified calcium carbonate 3g, modified ferrous sulfate 3g, Pt0.5g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Example 4

First, a modified calcium carbonate is prepared: mixing calcium carbonate and distilled water according to the proportion of 1:10-15, and adjusting the pH value to 5-6 for later use; adding sucrose into the calcium carbonate solution, and reacting at 50-60 ℃ for 1.5-3.5h to obtain calcium carbonate-sucrose mixed solution; and then putting the calcium carbonate and sucrose mixed solution into a high-speed stirrer, adding glycerol, stirring at an accelerated speed until the calcium carbonate and the sucrose mixed solution are completely mixed, and mixing molybdenum nitrate, manganese nitrate, nickel nitrate and ruthenium nitrate according to a weight ratio of 60-100: 5-20: 10-30: 10-30 ℃, synthesizing a calcium-titanium mineral substance at 350-600 ℃, dispersing and mixing the calcium-titanium mineral substance and the secondary modified calcium carbonate through airflow, finally performing microwave treatment, heating at 180 ℃ for 15min, standing and cooling to obtain modified calcium carbonate; then, modified ferrous sulfate was prepared: taking ferrous sulfate and polyethylene octene co-elastomer according to weight g, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu5g, Mn0.5g, modified calcium carbonate 2g, modified ferrous sulfate 2g, Pt0.001g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Example 5

First, a modified calcium carbonate is prepared: mixing calcium carbonate and distilled water according to the proportion of 1:10-15, and adjusting the pH value to 5-6 for later use; adding sucrose into the calcium carbonate solution, and reacting at 50-60 ℃ for 1.5-3.5h to obtain calcium carbonate-sucrose mixed solution; and then putting the calcium carbonate and sucrose mixed solution into a high-speed stirrer, adding glycerol, stirring at an accelerated speed until the calcium carbonate and the sucrose mixed solution are completely mixed, and mixing molybdenum nitrate, manganese nitrate, nickel nitrate and ruthenium nitrate according to a weight ratio of 60-100: 5-20: 10-30: 10-30 ℃, synthesizing a calcium-titanium mineral substance at 350-600 ℃, dispersing and mixing the calcium-titanium mineral substance and the secondary modified calcium carbonate through airflow, finally performing microwave treatment, heating at 180 ℃ for 15min, standing and cooling to obtain modified calcium carbonate; then, modified ferrous sulfate was prepared: taking ferrous sulfate and polyethylene octene co-elastomer according to weight g, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu25g, Mn2g, modified calcium carbonate 4g, modified ferrous sulfate 3g, Pt1g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Comparative example 1

Firstly, taking common calcium carbonate; then, modified ferrous sulfate was prepared: taking ferrous sulfate and polyethylene octene co-elastomer according to parts by weight, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu9g, Mn1.1g, common calcium carbonate 3g, modified ferrous sulfate 3g, Pt0.5g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Comparative example 2

Comparative example 3

Firstly, preparing modified ferrous sulfate: taking ferrous sulfate and polyethylene octene co-elastomer according to parts by weight, cleaning and crushing to prepare powder; placing ferrous sulfate and polyethylene octene co-elastomer powder into a high-speed stirrer, stirring at 800 rpm for 5-10 minutes, mixing and stirring, adding a plasticizer, a foaming agent and a corrosion inhibitor, stirring to a viscous state, and preferably, no particles are seen; placing the viscous substance in a reaction vat, adding water, stirring, simultaneously adding antioxidant, mixing well, and continuing stirring at 60-80 deg.C; adding the uniformly mixed materials into a double-screw extruder, wherein the processing temperature of the double-screw extruder is as follows: the temperature of a first zone is 190 ℃, the temperature of a second zone is 210 ℃, the temperature of a third zone is 230 ℃, the temperature of a fourth zone is 210 ℃, the temperature of a fifth zone is 215 ℃, the temperature of a sixth zone is 225 ℃, the temperature of a seventh zone is 235 ℃, the temperature of an eighth zone is 240 ℃, the rotating speed of a main machine is 320 revolutions per minute, and after extrusion, strip drawing, air drying and grain cutting are carried out, so that the modified ferrous sulfate is prepared; then, taking raw materials, wherein the raw materials comprise: cu9g, Mn1.1g, modified ferrous sulfate 3g, Pt0.5g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

Comparative example 4

Comparative example 5

Firstly, taking raw materials, wherein the raw materials comprise: cu9g, Mn1.1g, modified calcium carbonate 3g, modified ferrous sulfate 3g, Pt0.5g, and the balance of Al and inevitable impurities; next, removing oxide skins on the surfaces of Al, Cu, Mn and Pt, and preheating the raw materials to 300 ℃; then, preheating the crucible to 550 ℃, adding the crucible into an Al furnace, raising the temperature to 740 ℃, and introducing mixed gas of SF6 and CO2 in a volume ratio of 1:200 as protective gas; finally, after Al is completely melted, adding the Cu, Mn and Pt preheated to 300 ℃, and uniformly stirring; after the stirring is finished, heating the furnace temperature to 780 ℃, adding the zirconium source preheated to 300 ℃, and uniformly stirring to obtain molten metal; and (3) cooling the molten metal to 750 ℃, adding modified ferrous sulfate and modified calcium carbonate, and introducing 30s of argon gas for dehydrogenation to obtain the heat-resistant cast aluminum alloy.

The examples and comparative examples were examined;

the detection method comprises the following steps: dropping a heavy hammer with a certain mass and diamond or alloy steel balls onto the surface of the sample from a certain height, representing the measurement hardness value according to the rebound height of the heavy hammer, wherein the higher the rebound of the heavy hammer is, the harder the surface measurement is; the tensile strength and toughness were measured again by the general procedure and the results are given in the following table:

watch 1

	Shore Hardness (HL)	Tensile strength (N/(MPa))	Toughness (J/m 3)
				Example 1	325	293	530
Example 2	314	278	518
				Example 3	318	281	521
Example 4	312	273	525
				Example 5	317	279	523
Comparative example 1	310	275	519
				Comparative example 2	321	276	515
Comparative example 3	279	253	483
				Comparative example 4	263	241	477
Comparative example 5	253	231	457

As is clear from the table, the examples containing modified calcium carbonate and modified ferrous sulfate were much higher in metal hardness, tensile strength, and toughness than the comparative examples, and the compounding ratio of example 1 was the highest.

While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

完整详细技术资料下载

上一篇：石墨接头机器人自动装卡簧、装栓机

Heat-resistant cast aluminum alloy and preparation method thereof

相关技术

网友询问留言