1. A metal composite silicon carbide ceramic impeller is characterized in that: including carborundum pottery (6) and pouring metal skeleton (4) inside carborundum pottery (6), carborundum pottery (6) include front shroud (1), ceramic blade (2) and back shroud (3), ceramic blade (2) press from both sides and establish between front shroud (1) and back shroud (3), be provided with high temperature resistant buffer layer (5) between metal skeleton (4) and carborundum pottery (6), it has organic inorganic composite filler to pour into in high temperature resistant buffer layer (5) and carborundum pottery (6).

2. The metal composite silicon carbide ceramic impeller of claim 1, wherein: the high-temperature-resistant buffer layer (5) comprises 20-30 parts of adhesive and 60-70 parts of high-temperature-resistant additive, wherein the high-temperature-resistant additive is one or more of refractory fiber cotton, aluminum silicate fiber, rock wool and glass wool.

3. The metal composite silicon carbide ceramic impeller of claim 2, wherein: the adhesive comprises 5-10 parts of silica sol, 5-10 parts of methyl cellulose, 80-90 parts of water, 5-10 parts of silicon carbide fine powder and 1-5 parts of refractory cement.

4. The metal composite silicon carbide ceramic impeller of claim 1, wherein: the metal framework (4) is made of one of aluminum alloy, stainless steel, Cr26 high-chromium cast iron, Cr15Mo3 high-chromium cast iron, DF2 steel, 2507 duplex stainless steel, 2605N duplex stainless steel, 2205 duplex stainless steel, Cr30A high-chromium alloy, A49 white high-chromium alloy cast iron, A05 aluminum alloy and A51 aluminum alloy.

5. The metal composite silicon carbide ceramic impeller of claim 1, wherein: the thickness of the high-temperature-resistant buffer layer (5) is 4-10 mm.

6. The metal composite silicon carbide ceramic impeller of claim 1, wherein: the front cover plate (1) is provided with a plurality of first pouring holes (7), and the rear cover plate (3) is provided with a plurality of second pouring holes (8).

7. The metal composite silicon carbide ceramic impeller of claim 1, wherein: a pouring cavity is arranged in the through hole ceramic blade (2), a plurality of connecting columns (12) are arranged in the pouring cavity, and the metal framework forms through holes (9) at the connecting columns.

8. The metal composite silicon carbide ceramic impeller of claim 1, wherein: the organic-inorganic composite filler comprises inorganic micro powder, silica sol, resin, a defoaming agent, a coupling agent, a curing agent and a solvent.

9. The metal composite silicon carbide ceramic impeller of claim 1, wherein: the material of the silicon carbide ceramic (6) 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.

10. The method for manufacturing a metal composite silicon carbide ceramic impeller according to any one of claims 1 to 9, wherein: the method comprises the following steps:

s1, assembling and pouring or slip casting the lost foam inner core and the gypsum mold to form an impeller silicon carbide ceramic component;

s2, removing the inner mold and the outer mold, drying and trimming to obtain a silicon carbide ceramic impeller assembly blank;

s3, coating high-temperature-resistant buffer layers (5) on the periphery of the metal reserved cavity of the ceramic part;

s4, assembling and bonding the impeller silicon carbide ceramic part assembly by using a silicon carbide bonding material to form a silicon carbide ceramic impeller blank body containing an impeller metal framework (4) pouring cavity;

s5, placing the silicon carbide ceramic impeller blank into a high-temperature sintering furnace for sintering to obtain a silicon carbide ceramic impeller;

s6, placing the silicon carbide ceramic impeller in a high-temperature heat preservation device (11), gradually heating the high-temperature heat preservation device (11) to a pouring temperature, preserving heat for 10-15 min, and pouring or injecting molten metal into a metal pouring gap reserved in the silicon carbide ceramic impeller;

s7, after the pouring is finished, gradually cooling the high-temperature heat preservation device (11) to obtain a metal composite silicon carbide ceramic impeller blank;

s8, injecting organic and inorganic composite fillers into a ceramic layer and a high-temperature-resistant buffer layer (5) of the metal composite silicon carbide ceramic impeller blank, then filling a pouring hole (8) in the metal composite silicon carbide ceramic impeller with resin combined with the silicon carbide fillers, and finally curing for 6-12 hours at the temperature of below 200 ℃;

and S9, processing the metal composite silicon carbide ceramic impeller to form an impeller connecting thread, and obtaining the metal composite silicon carbide ceramic impeller.

Background

The heavy slurry pump is suitable for conveying slurry containing solid particles and having abrasion resistance and corrosion resistance, such as ore pulp conveying in a metallurgical dressing plant, ash conveying in a power plant, coal slurry conveying, heavy medium conveying and the like, the impeller is a core component of the heavy slurry pump, silicon carbide ceramic is used as a surface contact material of the impeller, the method is an important method for improving the abrasion resistance and the corrosion resistance of the impeller, and the service life of the impeller can be effectively prolonged.

The existing silicon carbide ceramic impeller usually adopts metal as a framework, then a layer of silicon carbide ceramic is bonded on the surface of the metal to improve the abrasion resistance of the impeller, the metal framework and the surface of the silicon carbide ceramic need to be manufactured respectively, and then bonding is carried out through a bonding agent, so that the process flow is complex.

Disclosure of Invention

The invention aims to provide a metal composite silicon carbide ceramic impeller which has the effects of simple manufacturing process, good impact resistance and long service life.

The technical purpose of the invention is realized by the following technical scheme: including carborundum pottery and the metal framework of pouring in carborundum pottery inside, the carborundum pottery includes front shroud, ceramic blade and back shroud, the ceramic blade presss from both sides and establishes between front shroud and back shroud, be provided with high temperature resistant buffer layer between metal framework and the carborundum pottery, there is the fit-up gap between high temperature resistant buffer layer and metal framework, the carborundum pottery, it has organic inorganic composite filler to fill in the fit-up gap.

The invention is further provided with: the high-temperature-resistant buffer layer comprises a bonding agent and a high-temperature-resistant additive, wherein the high-temperature-resistant additive is one or more of refractory fiber cotton, aluminum silicate fiber, rock wool and glass wool.

The invention is further provided with: the adhesive comprises 5-10 parts of silica sol, 5-10 parts of methyl cellulose, 80-90 parts of water, 5-10 parts of silicon carbide fine powder and 1-5 parts of refractory cement.

The invention is further provided with: the metal framework is made of one of aluminum alloy, stainless steel, Cr26 high-chromium cast iron, Cr15Mo3 high-chromium cast iron, DF2 steel, 2507 duplex stainless steel, 2605N duplex stainless steel and Cr30A high-chromium alloy.

The invention is further provided with: the thickness of the high-temperature-resistant buffer layer is 4-10 mm.

The invention is further provided with: a plurality of first pouring holes are formed in the front cover plate in a penetrating mode, and a plurality of second pouring holes are formed in the rear cover plate in a penetrating mode.

The invention is further provided with: a pouring cavity is arranged in the through hole ceramic blade, a plurality of connecting columns are arranged in the pouring cavity, and the metal framework forms through holes at the connecting columns.

The invention is further provided with: the organic-inorganic composite filler comprises inorganic micro powder, silica sol, resin, a defoaming agent, a coupling agent, a curing agent and a solvent.

The invention is further provided with: the material of the silicon carbide ceramic 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 is further provided with: the method comprises the following steps:

s1, assembling and pouring or slip casting the lost foam inner core and the gypsum mold to form an impeller silicon carbide ceramic component;

s2, removing the inner mold and the outer mold, drying and trimming to obtain a silicon carbide ceramic impeller assembly blank;

s3, coating high-temperature-resistant buffer layers on the periphery of the metal reserved cavity of the ceramic part;

s4, assembling and bonding the impeller silicon carbide ceramic part assembly by using a silicon carbide bonding material to form a silicon carbide ceramic impeller blank body containing an impeller metal framework pouring cavity;

s5, placing the silicon carbide ceramic impeller blank into a high-temperature sintering furnace for sintering to obtain a silicon carbide ceramic impeller;

s6, placing the silicon carbide ceramic impeller in a high-temperature heat preservation device with the functions of temperature rise and heat preservation, gradually raising the temperature of the high-temperature heat preservation device to a pouring temperature, preserving the heat for 10-15 min, and pouring or injecting molten metal into a metal pouring gap reserved in the silicon carbide ceramic impeller;

s7, after the pouring is finished, gradually cooling the high-temperature heat preservation device to obtain a metal composite silicon carbide ceramic impeller blank;

s8, injecting organic and inorganic composite fillers into a ceramic layer and a high-temperature-resistant buffer layer of the metal composite silicon carbide ceramic impeller blank, then filling a pouring hole on the metal composite silicon carbide ceramic impeller by adopting resin combined with the silicon carbide fillers, and finally curing for 6-12 hours at the temperature of below 200 ℃;

and S9, processing the metal composite silicon carbide ceramic impeller to form an impeller connecting thread, and obtaining the metal composite silicon carbide ceramic impeller.

The invention has the beneficial effects that:

1. the metal composite silicon carbide ceramic impeller is made of silicon carbide ceramic and a metal framework poured in the silicon carbide ceramic, when the silicon carbide ceramic part is prepared, a cavity is reserved in the center of the ceramic part, then the metal framework is poured into the reserved cavity, the formed metal framework is tightly attached to the silicon carbide ceramic part, the metal framework does not need to be cast, and the process flow is simplified.

2. The metal framework is manufactured by adopting a pouring mode, a pouring cavity is reserved in the silicon carbide ceramic part, the metal framework can completely adapt to the structure of the silicon carbide ceramic part, the metal framework is cooled to form a whole in the silicon carbide ceramic part, the casting difficulty is low, and the reinforcing effect on the strength of the silicon carbide ceramic is good.

3. The high-temperature-resistant buffer layer is arranged between the metal framework and the silicon carbide ceramic, and is coated in the reserved metal cavity of the silicon carbide ceramic, on one hand, the high-temperature-resistant buffer layer is positioned between the silicon carbide ceramic and the metal, and the metal is not directly contacted with the silicon carbide ceramic in the metal pouring process, so that the ceramic is prevented from being pulled by the contraction force generated in the metal cooling process, the stress generated by pulling of the metal and the ceramic is reduced, the impact resistance of the ceramic is improved, and the service life of the ceramic is prolonged; on the other hand, the high-temperature resistant buffer coating has certain expansibility, can fill gaps generated by metal shrinkage, and is combined with the high-temperature resistant buffer coating, so that the metal framework and the silicon carbide ceramic are always kept in a tightly combined state.

4. Organic and inorganic composite fillers are injected into the high-temperature-resistant buffer layer and the silicon carbide ceramic, and the organic and inorganic composite fillers can fill gaps in the high-temperature-resistant buffer layer and the silicon carbide ceramic, so that the composite integrity of the ceramic and the cast metal framework is ensured, and a good buffering effect is achieved.

5. The through holes are formed in the metal framework, so that on one hand, the metal pouring amount can be reduced; on the other hand, the contact area between the metal framework and the silicon carbide ceramic can be increased, so that the metal framework and the silicon carbide ceramic are connected more tightly.

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 cross-sectional view of a metal skeleton of a metal composite silicon carbide ceramic impeller before casting.

FIG. 2 is a schematic cross-sectional view of a metal composite silicon carbide ceramic impeller metal skeleton cast from a first casting bore and a second casting bore.

FIG. 3 is a schematic cross-sectional view of a metal composite silicon carbide ceramic impeller metal skeleton after casting from an impeller connecting hole.

FIG. 4 is a schematic cross-sectional view of a metal composite silicon carbide ceramic impeller after machining the connecting threads of the impeller.

Fig. 5 is a schematic view of a metal composite silicon carbide ceramic impeller structure.

In the figure, 1, a front cover plate; 2. a ceramic blade; 3. a rear cover plate; 4. a metal skeleton; 5. a high temperature resistant buffer layer; 6. silicon carbide ceramic; 7. a first pour hole; 8. a second pour hole; 9. a through hole; 10. an impeller attachment hole; 11. a high temperature heat preservation device; 12. connecting columns.

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 metal composite silicon carbide ceramic impeller comprises the following steps:

s1, assembling and pouring or slip casting the lost foam inner core and the gypsum mold to form an impeller silicon carbide ceramic component;

s2, removing the inner mold and the outer mold, drying and trimming to obtain a silicon carbide ceramic impeller assembly blank;

s3, coating a high-temperature-resistant buffer layer 5 on the periphery of a metal reserved cavity of a ceramic part, wherein the high-temperature-resistant buffer layer 5 is formed by mixing 20 parts of adhesive and 70 parts of refractory fiber cotton, and the adhesive comprises 5 parts of silica sol, 10 parts of methyl cellulose, 80 parts of water, 10 parts of silicon carbide fine powder and 1 part of refractory cement;

s4, assembling and bonding the impeller silicon carbide ceramic part assembly by using a silicon carbide bonding material to form a silicon carbide ceramic impeller blank body containing the impeller metal framework 4 pouring cavity;

s5, placing the silicon carbide ceramic impeller blank into a high-temperature sintering furnace for sintering to obtain a silicon carbide ceramic impeller;

s6, placing the silicon carbide ceramic impeller in a high-temperature heat preservation device 11 with the functions of temperature rise and heat preservation, gradually raising the temperature of the high-temperature heat preservation device 11 to a pouring temperature of 1500-1550 ℃, preserving the heat for 10min, and then injecting molten stainless steel into a metal pouring gap reserved in the silicon carbide ceramic impeller;

s7, after the pouring is finished, gradually cooling the high-temperature heat preservation device to obtain a metal composite silicon carbide ceramic impeller blank;

s8, reinforcing a metal composite silicon carbide ceramic impeller blank by using an organic-inorganic composite filler, injecting the organic-inorganic composite filler into a ceramic and high-temperature-resistant buffer layer 5, filling a pouring hole 8 in the metal composite silicon carbide ceramic impeller by using resin combined with a silicon carbide filler, and curing at 120 ℃ for 12 hours, wherein the organic-inorganic composite filler comprises 3 parts of nano zirconia, 7 parts of nano aluminum nitride, 6 parts of nano titanium dioxide, 2 parts of aluminum phosphate, 4 parts of sodium tripolyphosphate, 5 parts of silica sol, 2 parts of a coupling agent KH-540, 6 parts of polydimethylsiloxane, 6 parts of n-butyl alcohol, 15 parts of n-propanol, 14 parts of furfural resin, 2 parts of dibenzoyl peroxide and 1 part of tert-butyl peroxybenzoate;

and S9, processing the metal composite silicon carbide ceramic impeller to form impeller connecting threads, and obtaining the metal composite silicon carbide ceramic 6 impeller.

Example 2

A manufacturing method of a metal composite silicon carbide ceramic impeller comprises the following steps:

s1, assembling and pouring or grouting the lost foam inner core and the gypsum mold to form an impeller silicon oxide and silicon carbide combined ceramic part assembly;

s2, removing the inner and outer dies, drying and trimming to obtain a silicon oxide-silicon carbide ceramic impeller assembly blank;

s3, coating a high-temperature-resistant buffer layer 5 on the periphery of a metal reserved cavity of a ceramic part, wherein the high-temperature-resistant buffer layer 5 is formed by mixing 30 parts of adhesive and 60 parts of refractory fiber cotton, and the adhesive comprises 10 parts of silica sol, 5 parts of methyl cellulose, 90 parts of water, 5 parts of silicon carbide fine powder and 5 parts of refractory cement;

s4, assembling and bonding the impeller silicon oxide and silicon carbide ceramic part assembly by using a silicon carbide bonding material to form a silicon oxide and silicon carbide ceramic impeller blank body containing an impeller metal framework 4 pouring cavity;

s5, placing the silicon oxide and silicon carbide combined ceramic impeller blank into a high-temperature sintering furnace for sintering to obtain the silicon oxycarbide and silicon carbide combined ceramic impeller;

s6, placing the silicon oxide and silicon carbide ceramic impeller in a high-temperature heat preservation device 11, gradually heating the high-temperature heat preservation device 11 to a pouring temperature of 700-740 ℃, preserving heat for 15min, and pouring molten aluminum alloy into a metal pouring gap reserved in the silicon oxide and silicon carbide ceramic impeller;

s7, after the pouring is finished, gradually cooling the high-temperature heat preservation device to obtain a metal composite silicon oxide and silicon carbide combined ceramic impeller blank;

s8, reinforcing the metal composite silicon oxide and silicon carbide ceramic impeller blank by using an organic-inorganic composite filler, injecting the organic-inorganic composite filler into the ceramic and high-temperature-resistant buffer layer 5, filling a pouring hole 8 in the metal composite silicon oxide and silicon carbide ceramic impeller by using resin and silicon carbide filler, and curing at 60 ℃ for 12 hours, wherein the organic-inorganic composite filler comprises 6 parts of nano-zirconia, 3 parts of nano-aluminum nitride, 2 parts of nano-titanium dioxide, 1 part of aluminum phosphate, 5 parts of sodium tripolyphosphate, 4 parts of silica sol, 8 parts of a coupling agent KH-540, 2 parts of polydimethylsiloxane, 8 parts of n-butanol, 15 parts of n-propanol, 40 parts of xylene resin, 1 part of dibenzoyl peroxide and 1 part of tert-butyl peroxybenzoate;

and S9, processing the metal composite silicon oxide and silicon carbide ceramic impeller to form impeller connecting threads, and obtaining the metal composite silicon oxide and silicon carbide ceramic 6 impeller.

Wherein, the structure of the silicon oxide and silicon carbide combined ceramic impeller in the embodiment 1 and the embodiment 2 is shown in fig. 5, which comprises a front cover plate 1, a ceramic blade 2 and a back cover plate 3, as shown in figures 1 to 4, a metal framework 4 is poured inside a silicon oxide bonded silicon carbide ceramic 6, a high temperature resistant buffer layer 5 is arranged between the metal framework 4 and the silicon oxide bonded silicon carbide ceramic 6, a pouring cavity is arranged in a ceramic blade 2, a plurality of connecting columns 12 are arranged in the pouring cavity, the metal framework forms through holes 9 at the connecting columns, as shown in fig. 1 and 5, a plurality of first pouring holes 7 are arranged on the front cover plate 1, a plurality of second pouring holes 8 are arranged on the rear cover plate 3, after molten metal in the high-temperature furnace 11 enters from the first pouring hole 7 and the second pouring hole 8, the high-temperature heat preservation device is gradually cooled to obtain a metal framework shown in figure 2, and then an impeller connecting thread shown in figure 3 is machined at an impeller connecting hole 10.

Further, as shown in fig. 3 and 4, molten metal can be poured from the impeller connecting hole 10 in the high-temperature furnace 11, the high-temperature heat preservation device is gradually cooled to obtain the metal framework shown in fig. 3, and then the impeller connecting thread shown in fig. 4 is processed at the impeller connecting hole 10.

The metal framework of the ceramic body part in the embodiments 1 to 2 is formed by pouring, the formed metal framework is tightly attached to the silicon carbide ceramic part, the metal framework does not need to be cast, and the metal framework is tightly wrapped by the ceramic layer, so that the ceramic body part has good corrosion resistance and acid and alkali resistance; the bulk densities of examples 1 to 2 were in the range of 2.75 to 2.95g/cm³The apparent porosity is less than or equal to 1 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.

It should be noted that the above description is only a description of the preferred embodiment of the present invention, and any material that is resistant to high temperature and can be filled between the metal skeleton 4 and the silicon carbide ceramic 6 to serve as a space occupying layer can be used as the high temperature resistant buffer layer 5, and the main purpose is to isolate the molten metal and the silicon carbide ceramic impeller during the casting process, so as to avoid adhesion between the metal and the silicon carbide ceramic impeller, and the molten metal shrinks during the cooling and solidification process and does not generate tensile force on the silicon carbide ceramic impeller.