1. The utility model provides a heterogeneous reaction sintering carborundum ceramic pump which characterized in that: including pump case (1), preceding backplate (2), impeller (3) and backplate (4), pump case (1) preceding backplate (2), impeller (3) and backplate (4) are multilayer structure, from outer to interior ceramic structure spare (b), resin-carborundum combination adhesive linkage (c) and metal skeleton portion (a) of including in proper order, the hole intussuseption of ceramic structure spare (b) is filled with reaction sintering carborundum layer, ceramic structure spare (b) inner wall is provided with reaction sintering carborundum ceramic layer (x), reaction sintering carborundum layer and reaction sintering carborundum ceramic layer (x) integrated into one piece.

2. The complex phase reaction sintered silicon carbide ceramic pump as set forth in claim 1, wherein: reaction sintering carborundum ceramic layer is located on the tongue and the inner chamber wall of pump case (1) preceding backplate (2) with on the working face of direct and sediment thick liquid contact of backplate (4), impeller (3) are including connecting portion and the curved blade portion of a plurality of on the connecting portion, be provided with reaction sintering carborundum ceramic layer (x) on impeller (3).

3. The complex phase reaction sintered silicon carbide ceramic pump as set forth in claim 1, wherein: reaction sintering carborundum ceramic layer dispersion sets up on the tongue and the inner chamber wall of pump case (1) preceding backplate (2) with on the working face of direct and sediment thick liquid contact of backplate (4), impeller (3) are including connecting portion and the curved blade portion of a plurality of on the connecting portion, the dispersion is provided with reaction sintering carborundum ceramic layer (x) on impeller (3).

4. The method for manufacturing a complex phase reaction sintered silicon carbide ceramic pump according to any one of claims 1 to 3, wherein: the method comprises the following steps:

s1, preparing a casting material, casting and molding in an assembled mold, demolding, drying and trimming a molded blank, sintering the dried blank into a silicon nitride-bonded silicon carbide ceramic structural member (b), and performing organic carburization and solidification in the pores of the silicon nitride-bonded silicon carbide ceramic structural member (b);

s2, combining the organic carburized silicon nitride with the silicon carbide ceramic structural part, forming an inner forming die and a gypsum outer die into a reaction sintering silicon carbide casting or slip casting cavity;

s3, pouring or grouting the reaction sintering silicon carbide slurry into a molding cavity, standing for a period of time after molding, demolding, drying, trimming, and compounding a reaction sintering silicon carbide ceramic blank on a silicon nitride-bonded silicon carbide ceramic layer;

s4, placing the composite ceramic blank into a reaction sintering furnace, covering silicon powder, and performing reaction sintering at the temperature of 1600-1800 ℃ under the protection of inert gas to obtain a reaction sintered silicon carbide and silicon nitride combined silicon carbide ceramic structural member (b);

s5, coating one or more interface layers on the surface of the ceramic structural member processed in the step S4, curing the ceramic structural member at the temperature of 60-120 ℃ for 3-8 hours, coating one or more interface layers on the surface of the metal framework part (a), and curing the metal framework part at the temperature of 60-120 ℃ for 3-6 hours;

s6, combining the ceramic structure with the metal skeleton portion (a): assembling a reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural part (b) and a metal framework part (a) into a whole, filling resin-silicon carbide combined bonding slurry into a gap between the reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural part (b) and the metal framework part (a), and after filling, placing at 60-120 ℃ for curing for 6-12 hours to respectively obtain a silicon carbide ceramic composite impeller (3), a front guard plate (2), a rear guard plate (4) and a pump shell (1);

and S7, assembling the combined impeller (3), the front guard plate (2), the rear guard plate (4), the pump shell (1) and the metal joint plate, the mechanical seal and the bracket into a complete slurry pump.

5. The method for manufacturing the complex phase reaction sintered silicon carbide ceramic pump according to claim 4, wherein the method comprises the following steps: the organic carburizing step in step S1 is: and (c) injecting organic carburizing fluid into the silicon nitride-combined silicon carbide ceramic structural part (b), wherein the organic carburizing fluid comprises an organic monomer and an auxiliary agent required by the polymerization reaction of the organic monomer.

6. The method for manufacturing the complex phase reaction sintered silicon carbide ceramic pump according to claim 5, wherein the method comprises the following steps: the organic carburizing liquid in the step S1 further includes carbon powder and a dispersant, and the dispersant is a styrene carboxylic acid dispersant or a nonionic dispersant.

7. The method for manufacturing the complex phase reaction sintered silicon carbide ceramic pump according to claim 4, wherein the method comprises the following steps: in the step S2, the joint of the organic carburized silicon nitride bonded silicon carbide ceramic structural member (b) and the molding cavity is coated with an adhesive.

8. The method for manufacturing the complex phase reaction sintered silicon carbide ceramic pump according to claim 7, wherein the method comprises the following steps: the adhesive comprises, by mass, 80-90 parts of silicon carbide powder, 5-15 parts of carbon black, 8-15 parts of resin, 2-4 parts of a coupling agent, 1-2 parts of a curing agent and 1-5 parts of silica micro powder.

9. The method for manufacturing a complex phase reaction sintered silicon carbide ceramic pump according to any one of claims 4 to 8, wherein: the material of the silicon nitride combined silicon carbide ceramic structural member (b) can be replaced by one or more of silicon oxide combined silicon carbide ceramic, pressureless sintered silicon carbide ceramic, alumina high-temperature ceramic and complex phase high-temperature ceramic.

Background

Silicon carbide-based ceramic materials are a series of ceramic materials developed on the basis of silicon carbide ceramics, including: oxide-bonded silicon carbide, silicon nitride-bonded silicon carbide, Sialon-bonded silicon carbide and other high-tech ceramic materials. The series of ceramic materials have a series of excellent performances such as high temperature resistance, high strength, corrosion resistance, thermal shock resistance, oxidation resistance, wear resistance and the like, and are widely applied to the fields of metallurgy, ceramics, building materials, petrifaction, machinery, power electronics, automobiles, aerospace and the like. The silicon nitride-silicon carbide combined ceramic material utilizes metal silicon powder to perform nitridation reaction in nitrogen to form silicon nitride, and silicon carbide particles are combined into a whole, so that a microstructure with an interwoven network structure is formed. The preparation process is simple, the investment cost is low, and the method is suitable for large-scale production and is one of varieties with large market demand.

At present, large and complex-structure products generally adopt a grouting forming method, and the products have high open porosity and low volume density (generally, the open porosity is up to more than 18 percent, and the volume density is 2.50g/cm³Below), the product performance is seriously affected and the application range is limited. The slurry pump can be made of silicon nitride and silicon carbide ceramic, has good corrosion resistance and high strength, but has large particles with the size of 4-15 mm in conveyed slurry, large slurry flow and strong abrasion and impact resistance of the slurry, or needs the ceramic pump to have good strong abrasion resistance, alkali corrosion resistance and impact resistance at the same time under the working condition environment of conveying strong alkaline corrosion slurry and high hardness (Mohs hardness 7 grade) strong abrasion slurry in the alumina beneficiation industry, and the current domestic and foreign ceramic pumps can not meet the performance requirements of the working condition on materials.

Disclosure of Invention

The invention aims to provide a manufacturing method of a complex phase reaction sintered silicon carbide ceramic pump, which has the effects of simple manufacturing method, high strength, low apparent porosity and long service life.

The technical purpose of the invention is realized by the following technical scheme: the pump shell, the front guard plate, the impeller and the rear guard plate are all multilayer mechanisms and sequentially comprise a ceramic structural member, a resin-silicon carbide combined bonding layer and a metal framework part from outside to inside, a reaction sintered silicon carbide layer is filled in a pore of the ceramic structural member, a reaction sintered silicon carbide ceramic layer is arranged on the inner wall of the ceramic structural member, and the reaction sintered silicon carbide layer and the reaction sintered silicon carbide ceramic layer are integrally formed.

The invention is further provided with: reaction sintering carborundum ceramic layer is located on the tongue of pump case and the inner chamber wall the front fender with the intermediate position department of backplate, the impeller is including connecting portion and the curved blade portion of a plurality of on the connecting portion, on the impeller reaction sintering carborundum ceramic layer is located the tip that the blade portion is close to the connecting portion center.

A manufacturing method of a multiphase reaction sintered silicon carbide ceramic pump is characterized by comprising the following steps: the method comprises the following steps:

s1, preparing a casting material, casting and molding in an assembled mold, demolding, drying and trimming a molded blank, sintering the dried blank into a silicon nitride-bonded silicon carbide ceramic structural member, and performing organic carburization and solidification in the pores of the silicon nitride-bonded silicon carbide ceramic structural member;

s2, combining the organic carburized silicon nitride with the silicon carbide ceramic structural part, forming an inner forming die and a gypsum outer die into a reaction sintering silicon carbide casting or slip casting cavity;

s3, pouring or grouting the reaction sintering silicon carbide slurry into a molding cavity, standing for a period of time after molding, demolding, drying, trimming, and compounding a reaction sintering silicon carbide ceramic blank on a silicon nitride-bonded silicon carbide ceramic layer;

s4, placing the composite ceramic blank into a reaction sintering furnace, covering silicon powder, and performing reaction sintering at the temperature of 1600-1800 ℃ under the protection of inert gas to obtain a reaction sintered silicon carbide and silicon nitride combined silicon carbide ceramic structural member;

s5, coating one or more interface layers on the surface of the ceramic structural member processed in the step S4, curing the ceramic structural member at the temperature of 60-120 ℃ for 3-8 hours, coating one or more interface layers on the surface of the metal framework part, and curing the metal framework part at the temperature of 60-120 ℃ for 3-6 hours;

s6, combining the ceramic structure with the metal skeleton portion: assembling a reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural part and a metal framework part into a whole, filling resin-silicon carbide combined bonding slurry into a gap between the reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural part and the metal framework part, placing the mixture at 60-120 ℃ after filling, and curing for 6-12 hours to respectively obtain a silicon carbide ceramic composite impeller, a front guard plate, a rear guard plate and a pump shell;

and S7, assembling the combined impeller, front guard plate, rear guard plate and pump shell with metal joint plate, mechanical seal and bracket to form the complete slurry pump.

The invention is further provided with: the organic carburizing step in step S1 is: and injecting organic carburizing liquid into the silicon nitride and silicon carbide combined ceramic structural part, wherein the organic carburizing liquid comprises an organic monomer and an auxiliary agent required by the polymerization reaction of the organic monomer.

The invention is further provided with: the organic carburizing liquid in step S1 further includes carbon powder and a dispersant.

The invention is further provided with: the dispersing agent is a styrene carboxylic acid dispersing agent or a nonionic dispersing agent.

The invention is further provided with: and in the step S2, the joint of the organic carburized silicon nitride combined silicon carbide ceramic structural part and the forming cavity is coated with adhesive.

The invention is further provided with: the adhesive comprises, by mass, 80-90 parts of silicon carbide powder, 5-15 parts of carbon black, 8-15 parts of resin, 2-4 parts of a coupling agent, 1-2 parts of a curing agent and 1-5 parts of silica micro powder. .

The invention is further provided with: the material of the silicon nitride combined silicon carbide ceramic structural member (b) can be replaced by one or more of silicon oxide combined silicon carbide ceramic, pressureless sintered silicon carbide ceramic, alumina high-temperature ceramic and complex phase high-temperature ceramic.

The invention has the beneficial effects that:

1. injecting organic carburizing liquid into a fired ceramic structural member, then covering silicon powder, and then carrying out secondary sintering, wherein organic matters in the organic carburizing liquid are carbonized under the high-temperature condition, decomposed gas is discharged, a part of each pore on the silicon nitride-silicon carbide ceramic structural member filled with organic monomers is opened, when the temperature in a sintering furnace is raised to be more than 1600 ℃, industrial silicon powder in the sintering furnace is melted, and the melted silicon liquid is gradually immersed into the reopened pores on the ceramic structural member along with the rise of the temperature and reacts with the carbon in the pores to generate silicon carbide, so that the apparent porosity of the ceramic structural member can be greatly reduced, and the apparent porosity is reduced from about 19% to less than or equal to 2%.

2. Compared with the conventional resin ceramic reinforcing agent filled in the pores of the ceramic structural member, the silicon carbide filled in the pores can enhance the strength and toughness of the ceramic structural member and improve the volume density of the ceramic pump body, so that the pump body achieves better abrasion resistance and impact resistance.

3. The reaction sintering silicon carbide ceramic part is directly formed on the ceramic structural part by grouting, the reaction sintering silicon carbide ceramic parts at different parts of the ceramic structural part can be simultaneously prepared, and in the secondary sintering process, the reaction sintering ceramic part is tightly combined with the ceramic structural part, so that the reaction sintering silicon carbide ceramic part and the pump body are good in integration, the process flow is simplified, and the wear resistance of the pump body is improved.

4. During secondary sintering, the silicon carbide blank and the ceramic structural member both contain carbon, in the high-temperature sintering process, silicon powder covered outside the composite ceramic blank is melted at high temperature and permeates into the composite ceramic blank, and under the siphon action, liquid silicon fills the pores in the composite ceramic blank and reacts with the carbon in the pores to generate silicon carbide, and the silicon carbide generated on the bonding surface of the silicon carbide blank and the ceramic structural member by reactive sintering can form a whole, so that a better bonding effect can be obtained compared with the traditional bonding agent.

5. Organic monomers in the organic carburizing liquid and organic matters obtained by polymerizing the organic monomers are injected into the ceramic structural member, and the organic monomers are polymerized firstly, then carbonized in the reaction sintering process and reacted with molten silicon to generate silicon carbide; carbon powder is added into the organic carburizing liquid, the particle size of the carbon powder is larger than that of the carbonized organic polymer, and the carbon powder reacts with silicon to generate silicon carbide with larger particle size, so that the hardness of the filler is improved; the dispersant plays a role in dispersing, and the styrene carboxylic acid dispersant or the nonionic dispersant on the other side can also be carbonized at high temperature, so that the influence of other substances introduced into the filling liquid on the filling volume density can be avoided.

6. The bonding agent is coated at the joint of the ceramic structural member and the forming cavity, so that the initial bonding strength of the reaction sintered silicon carbide blank and the ceramic structural member can be improved, cracks can be prevented from being generated between the ceramic structural member and the forming cavity, the bonding strength of the reaction sintered silicon carbide is enhanced, and the bonding agent is bonded with silicon nitride to produce a silicon carbide layer on a bonding surface of the silicon carbide in the sintering process, so that the bonding capability is enhanced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view showing the positional relationship of a reaction-sintered silicon carbide ceramic layer in example 1.

FIG. 2 is a schematic view showing the positional relationship between reaction-sintered silicon carbide ceramic layers in examples 2 and 3.

In the drawings, 1, a pump casing; 2. a front guard plate; 3. an impeller; 4. a rear guard plate; a. a metal skeleton portion; b. a ceramic structural member; c. a resin-silicon carbide combined bonding layer; and x, reaction sintering the silicon carbide ceramic layer.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

Example 1

A manufacturing method of a complex phase reaction sintering silicon carbide ceramic pump comprises the following steps:

s1, preparing a casting material, casting and molding in an assembled mold, demolding, drying and trimming a molded blank, sintering the dried blank to prepare a silicon nitride-bonded silicon carbide ceramic structural member b, and performing organic carburization and solidification in the pores of the silicon nitride-bonded silicon carbide ceramic structural member b;

s2, combining the organic carburized silicon nitride and silicon carbide ceramic structural part b with a forming inner die and a gypsum outer die to form a reaction sintering silicon carbide casting or grouting forming cavity, wherein the forming cavity is positioned on the inner wall of the pump shell 1 as shown in figure 1 to form a reaction sintering silicon carbide ceramic layer;

s3, pouring or grouting the reaction sintering silicon carbide slurry into a molding cavity, standing for a period of time after molding, demolding, drying, trimming, and compounding a reaction sintering silicon carbide ceramic blank on a silicon nitride-bonded silicon carbide ceramic layer;

s4, placing the composite ceramic blank into a reaction sintering furnace, covering silicon powder, and performing reaction sintering at 1600 ℃ under the protection of inert gas to obtain a reaction sintered silicon carbide and silicon nitride combined silicon carbide ceramic structural member b;

s5, coating one or more interface layers on the surface of the ceramic structural part b processed in the step S4, curing the ceramic structural part b at 120 ℃ for 3 hours, coating one or more interface layers on the surface of the metal framework part a, and curing the metal framework part a at 120 ℃ for 3 hours;

and S6, compounding the reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural member b with the metal framework part a: assembling a reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural part b and a metal framework part a into a whole, filling resin-silicon carbide combined bonding slurry into a gap between the reaction sintered silicon carbide + silicon nitride combined silicon carbide ceramic structural part b and the metal framework part a, placing at 120 ℃ for curing for 6 hours after filling, and respectively obtaining a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1;

and S7, assembling the combined impeller 3, front guard plate 2, rear guard plate 4 and pump shell 1 with a metal joint plate, a mechanical seal and a bracket into a complete slurry pump.

The filling liquid in step S1 includes azodiisobutyronitrile, which is an auxiliary agent and accounts for 2% of the total weight of styrene and methyl methacrylate.

In the step S2, an adhesive is coated on the joint of the organic carburized silicon nitride-bonded silicon carbide ceramic structural member b and the molding cavity, and the adhesive comprises 80 parts by mass of silicon carbide powder, 15 parts by mass of carbon, 8 parts by mass of resin, 4 parts by mass of coupling agent, 1 part by mass of curing agent, and 2 parts by mass of silica micropowder serving as a bonding agent, wherein the resin is epoxy resin, the coupling agent is KH550, and the curing agent is m-phenylenediamine.

Example 2

A manufacturing method of a complex phase reaction sintering silicon carbide ceramic pump comprises the following steps:

s1, preparing a casting material, casting and molding in an assembled mold, demolding, drying and trimming a molded blank, sintering the dried blank to prepare a silicon oxide-silicon carbide combined ceramic structural member b, and performing organic carburization and solidification in pores of the silicon oxide-silicon carbide combined ceramic structural member b;

s2, combining the organic carburized silicon oxide with the silicon carbide ceramic structural part b, forming a reaction sintering silicon carbide pouring or grouting forming cavity by the forming inner die and the gypsum outer die, and dispersing the reaction sintering silicon carbide on the ceramic structural part b as shown in figure 2;

s3, pouring or grouting the reaction sintering silicon carbide slurry into a molding cavity, standing for a period of time after molding, demolding, drying, trimming, and compounding a reaction sintering silicon carbide ceramic blank on a silicon nitride-bonded silicon carbide ceramic layer;

s4, placing the composite ceramic blank into a reaction sintering furnace, covering silicon powder, and performing reaction sintering at the temperature of 1800 ℃ under the protection of inert gas to obtain a reaction sintered silicon carbide and silicon oxide combined silicon carbide ceramic structural member b;

s5, coating one or more interface layers on the surface of the ceramic structural part b processed in the step S4, curing the ceramic structural part b at the temperature of 60 ℃ for 8 hours, coating one or more interface layers on the surface of the metal framework part a, and curing the metal framework part a at the temperature of 60 ℃ for 6 hours;

and S6, compounding the reaction sintered silicon carbide and silicon oxide combined silicon carbide ceramic structural member b with the metal skeleton part a: assembling a reaction sintered silicon carbide + silicon oxide combined silicon carbide ceramic structural part b and a metal framework part a into a whole, filling resin-silicon carbide combined bonding slurry into a gap between the reaction sintered silicon carbide + silicon oxide combined silicon carbide ceramic structural part b and the metal framework part a, placing the mixture at 60 ℃ after filling, and curing for 12 hours to respectively obtain a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1;

and S7, assembling the combined impeller 33, the front guard plate 22, the rear guard plate 44 and the pump shell 11 with metal joint plates, mechanical seals and brackets to form a complete slurry pump.

In step S1, the filling liquid comprises 1% of an auxiliary agent azodiisobutyronitrile, carbon powder with a particle size of 10-20 μm and a styrene carboxylic acid dispersant, wherein the auxiliary agent azodiisobutyronitrile is the sum of styrene and methyl methacrylate.

In the step S2, an adhesive is coated on a joint of the organic carburized silicon oxide-silicon carbide ceramic structural member b and the molding cavity, and the adhesive comprises 90 parts by mass of silicon carbide powder, 5 parts by mass of carbon black, 10 parts by mass of resin, 2 parts by mass of a coupling agent, 2 parts by mass of a curing agent, 1 part by mass of silica micropowder, epoxy resin, KH550 as a coupling agent, and m-phenylenediamine as a curing agent.

Example 3

A manufacturing method of a complex phase reaction sintering silicon carbide ceramic pump comprises the following steps:

s1, preparing a casting material, casting and molding in an assembled mold, demolding, drying and trimming a molded blank, sintering the dried blank to prepare a ceramic structural member b formed by compounding pressureless sintered silicon carbide and silicon nitride combined silicon carbide, and performing organic carburization and curing in the pores of the pressureless sintered silicon carbide ceramic structural member b;

s2, forming a reaction sintering silicon carbide pouring or slip casting molding cavity by a ceramic structural member b formed by compounding organic carburized pressureless sintering silicon carbide and silicon nitride combined silicon carbide, and a molding inner mold and a gypsum outer mold; the pressureless sintering silicon carbide and silicon nitride combined silicon carbide composite ceramic structural member b is understood to be a pump body which is formed by splicing the two materials at different parts.

S3, pouring or grouting the reaction sintering silicon carbide slurry into a molding cavity, standing for a period of time after molding, demolding, drying, trimming, and compounding a reaction sintering silicon carbide ceramic blank on a silicon nitride-bonded silicon carbide ceramic layer;

s4, placing the composite ceramic blank into a reaction sintering furnace, covering silicon powder, and performing reaction sintering at 1700 ℃ under the protection of inert gas to obtain a reaction sintered silicon carbide and pressureless sintered silicon carbide ceramic structural component b;

s5, coating one or more interface layers on the surface of the ceramic structural part b processed in the step S4, curing the ceramic structural part b at 90 ℃ for 6 hours, coating one or more interface layers on the surface of the metal framework part a, and curing the metal framework part a at 90 ℃ for 5 hours;

s6, combining the ceramic structure with the metal skeleton portion a: assembling a ceramic structure and a metal framework part a into a whole, filling resin-silicon carbide combined bonding slurry into a gap between the ceramic structure and the metal framework part a, and then placing the ceramic structure and the metal framework part a at 90 ℃ for curing for 9 hours to respectively obtain a silicon carbide ceramic composite impeller 3, a front guard plate 2, a rear guard plate 4 and a pump shell 1;

and S7, assembling the combined impeller 3, front guard plate 2, rear guard plate 4 and pump shell 1 with a metal joint plate, a mechanical seal and a bracket into a complete slurry pump.

The filling liquid in step S1 includes an auxiliary azodiisobutyronitrile 1% by weight of the sum of styrene and methyl methacrylate, carbon black having a particle size of 5 μm, and a nonionic dispersant octylphenol polyoxyethylene ether.

In the step S2, an adhesive is coated on a joint of the organic carburized pressureless sintered silicon carbide ceramic structural member b and the molding cavity, and the adhesive comprises 85 parts by mass of silicon carbide powder, 10 parts by mass of carbon black, 11 parts by mass of resin, 3 parts by mass of a coupling agent, 1 part by mass of a curing agent, 3 parts by mass of silica micropowder, epoxy resin as the resin, KH550 as the coupling agent, and m-phenylenediamine as the curing agent.

In the embodiment 1, as shown in fig. 1, the reaction sintered silicon carbide ceramic layer x covers the diaphragm and the inner cavity wall of the pump housing 1, the working surfaces of the front guard plate 2 and the rear guard plate 4 which directly contact with the slurry and the impeller in a large scale, and the impeller 3 includes a connecting part and a plurality of arc-shaped blade parts on the connecting part; as shown in fig. 2, in example 2 and example 3, the reaction sintered silicon carbide ceramic layers x on the impeller 3 were arranged in a dispersed manner. The reaction sintering silicon carbide ceramic layer x is provided with a plurality of bulges, and the ceramic structural member b is provided with a plurality of grooves for embedding the bulges, so that the reaction sintering silicon carbide ceramic layer x and the ceramic structural member b can be combined more tightly.

Further optimized, the material of the silicon nitride combined silicon carbide ceramic structural component (b) can be replaced by one or more of silicon oxide combined silicon carbide ceramic, pressureless sintered silicon carbide ceramic, alumina high-temperature ceramic and complex-phase high-temperature ceramic.

The flow rates of the slurry pumps manufactured by the embodiments 1 to 3 are all 160-4500m³The lift is between 11 and 110m, the rotating speed is between 50 and 1550r/min, and the efficiency is between 65 and 82 percent. The pump is suitable for the delivery of a medium under an acidic condition, the weight concentration is less than or equal to 70 percent, the maximum particle size is less than or equal to 15mm (the pump has strong abrasion resistance), the temperature is less than or equal to 100 ℃, and the service life of the pump is more than 4 times that of a traditional pump under the same working condition and environment. The ceramic structural member b of examples 1 to 3 had a bulk density of 2.75 to 2.95g/cm³The apparent porosity is less than or equal to 2 percent, the normal-temperature breaking strength reaches more than 100MPa, most of air holes of the silicon nitride and silicon carbide combined material are sealed, the contact area of silicon carbide particles and slurry with corrosion is effectively reduced, the slurry leakage is solved, and the acid-base corrosion resistance of the material is improved.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.