CN113278843B - Manufacturing process for preparing metal-based ceramic composite material by hot isostatic pressing - Google Patents
Manufacturing process for preparing metal-based ceramic composite material by hot isostatic pressing Download PDFInfo
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- CN113278843B CN113278843B CN202110570444.9A CN202110570444A CN113278843B CN 113278843 B CN113278843 B CN 113278843B CN 202110570444 A CN202110570444 A CN 202110570444A CN 113278843 B CN113278843 B CN 113278843B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/04—Casting by dipping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
- C22C1/1073—Infiltration or casting under mechanical pressure, e.g. squeeze casting
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Abstract
A technology for preparing the metal-base ceramic composite material by hot isostatic pressing includes such steps as directly filling the powdered ceramic particles in the mould, vibrating to compact the powdered ceramic particles to obtain the required volume fraction, putting the mould in the internal sleeve mould, preheating the mould together with internal sleeve mould in preheating furnace to a certain temp, die casting, clamping the preheated internal sleeve mould and product mould by fork truck, pouring the treated molten metal in the internal sleeve mould, vacuumizing, die casting, aluminizing, holding pressure, cooling for a certain time, ejecting out the pressed blank, cooling, cutting, demoulding, taking out the die-cast blank of metal-base ceramic composite material, and machining. The defects of the traditional die-casting preparation technology are overcome, the defects in the die-casting of the material are effectively controlled, and the density, quality and performance of the metal-based ceramic composite material are greatly improved.
Description
Technical Field
The invention relates to the technical field of composite material preparation processes, in particular to a process for preparing a metal matrix ceramic composite material by hot isostatic pressing.
Background
The particle reinforced metal matrix ceramic composite material has the advantages of high heat conduction, low expansion, light weight and the like, has the characteristics of higher specific strength, specific rigidity, specific modulus, wear resistance and the like, and can better meet the requirement on the special performance of a high-performance heat dissipation material.
The particle reinforced metal matrix ceramic composite material is considered as a new generation advanced composite material with the most development prospect in the 21 st century, and is widely applied to the fields of aerospace, electronic industry, military radars, rail transit and the like.
At present, the preparation process of the metal-based ceramic composite material is mainly divided into two major types, namely a solid phase process and a liquid phase process, wherein the solid phase process comprises a powder metallurgy method, a hot isostatic pressing method, a discharge plasma sintering method and the like, and the liquid phase process comprises a stirring fusion casting method, a non-pressure infiltration method, a pressure casting method and the like. The method has advantages and disadvantages, but if mass production needs to be considered, the die-casting forming technology is the best choice, the production efficiency is high, the method is suitable for forming parts with complex structures and high dimensional precision, and mass and low-cost manufacturing can be realized.
The traditional die-casting technology of the metal-based ceramic composite material is to prepare a prefabricated member of reinforcement particles, preheat the prefabricated member and a die together, press metal liquid into the prefabricated member under the action of a press, and then obtain a blank of the metal-based ceramic composite material through the steps of pressure maintaining, cooling, demoulding and the like. Although the process is efficient and simple, problems still exist in actual production, on one hand, a binder or a pore-forming agent needs to be added into the prepared prefabricated member, and the residue of the binder in the prefabricated member affects the performance of the composite material to a certain extent no matter the prefabricated member is prepared by a wet method (sintering after drying moisture) or prepared by a dry method (sintering after compression molding), and the problems of uneven mixing of the binder, cracking during drying, stress deformation during metal infiltration and the like are easily caused; on the other hand, in the conventional die casting technology, die casting is usually performed in a state that the molten metal has a higher melting temperature, and when the high-temperature molten metal is in contact with the ceramic particles, a chemical reaction is generated to generate a bad compound which influences the performance and quality of the composite material. If a lower molten metal melting temperature is adopted, the generation of undesirable compounds can be greatly reduced, but in the metal infiltration process, because the heat of the molten metal can be absorbed greatly when the die is contacted with the pressure head and the molten metal with high temperature is contacted, the molten metal contacted with an outer sleeve die and the like is rapidly solidified, the solidified metal generates a certain supporting force on the pressure head, and the pressure applied by the pressure head to the molten metal is greatly reduced. Because the temperature of the core part of the die is higher than that of the outside in the cooling process of the molten metal, the continuously reduced pressure hinders the infiltration effect of the molten metal in the gaps of the particles of the core part reinforcement, so that the density of each part of the composite material has larger difference, and particularly, the composite material of the core part is easy to have the defects of shrinkage porosity, air holes and the like in the cooling process due to insufficient pressure of the molten metal, thereby seriously affecting the performance and quality of the product.
Disclosure of Invention
The applicant provides a manufacturing process for preparing a metal-based ceramic composite material by hot isostatic pressing aiming at the defects in the prior art, so that the defects of air holes and the like possibly generated by the material during die casting can be effectively controlled by pressure maintaining, the permeability of molten metal in a reinforcement gap is improved, the prepared composite material has high compactness and low air hole rate, and the quality and the performance of a product are greatly improved.
The technical scheme adopted by the invention is as follows:
a process for preparing the composite metal-base ceramic material by hot isostatic pressing includes such steps as moulding, die setting in internal and external moulds,
the bottom of the inner sleeve die is provided with an inner sleeve die bottom plate in a matching way,
the bottom of the outer cover die is provided with an outer cover die bottom plate capable of moving up and down;
the specific process steps are as follows:
the first step is as follows: mixing and fully stirring a plurality of ceramic reinforcement powder with different particle sizes to prepare powder to be filled;
the second step is that: all parts forming the product forming die are disassembled, and a release agent is uniformly sprayed on the surface of each part;
the third step: assembling the parts of which the surfaces are uniformly coated with the release agent in the second step into a product forming die;
the fourth step: filling the fully stirred powder into a cavity of a product forming die, and compacting the powder in the product forming die through vibration and extrusion;
the fifth step: uniformly spraying a release agent on the inner wall and the outer wall of the inner sleeve die and the surface of the bottom plate of the inner sleeve die;
and a sixth step: placing a product forming mold filled with powder on an inner sleeve mold bottom plate in an inner sleeve mold cavity;
the seventh step: placing the inner sleeve mold with the product forming mold into a preheating furnace by using a forklift supporting clamp, preheating to 500-700 ℃, preserving heat for 3-5 hours, and uniformly heating the inner sleeve mold, the inner sleeve mold bottom plate, the product forming mold and powder;
eighth step: uniformly spraying a release agent on the inner wall of the outer sleeve die, the bottom surface of the outer sleeve die, the bottom plate of the outer sleeve die and the upper surface of the ejector rod of the press;
the ninth step: a high-frequency heater is arranged outside the middle section of the outer sleeve mold, the high-frequency heater is started to work, and the middle section of the outer sleeve mold is heated at the temperature of 200-300 ℃;
the tenth step: lifting the press ejector rod, lifting the upper surface of the press ejector rod to be higher than the upper surface of the outer sleeve mold, and then placing the outer sleeve mold bottom plate on the upper surface of the press ejector rod;
the eleventh step: placing the preheated inner sleeve mold provided with the product forming mold on the outer sleeve mold bottom plate by using a forklift, and ensuring the stability of the inner sleeve mold;
the twelfth step: lowering a press ejector rod to enable the outer sleeve mold bottom plate and the inner sleeve mold to be slowly placed into the outer sleeve mold along the inner wall of the outer sleeve mold, and enabling the outer sleeve mold bottom plate to be in contact with the upper surface of the workbench;
the thirteenth step: injecting the pretreated metal liquid into the inner sleeve mold, controlling the pouring temperature of the metal liquid to be 100-200 ℃ above the melting point of the metal, and submerging the product forming mold by the metal liquid, namely the liquid level of the metal liquid exceeds the product forming mold;
the fourteenth step is that: the bottom of a channel formed by the outer sleeve mold bottom plate and the inner sleeve mold bottom plate is connected with an air suction pipeline, after molten metal is injected, an externally connected vacuum pump is started, and the interior of the product forming mold is vacuumized through the channel, so that negative pressure is generated in the product forming mold;
the fifteenth step: starting a press, reducing the pressure under a pressure head, putting the pressure into an inner sleeve die, applying 50-120Mpa ultrahigh pressure to the molten metal to fully infiltrate the molten metal into the gaps of the powder, maintaining the pressure for 5-15 minutes, and maintaining the pressure until the molten metal is completely solidified;
sixteenth, step: when the molten metal infiltrates the powder gap, the wall of the linear section of the inner sleeve die is provided with a U-shaped groove, part of the molten metal overflows through the U-shaped groove in the process of pressing down by a pressure head, and finally extends outwards to the upper part of the fit gap between the outer sleeve die and the inner sleeve die, and even infiltrates into the gap, and the part of the molten metal is solidified to seal the fit gap opening of the inner sleeve die and the outer sleeve die, so that the whole annular fit gap is isolated from the outside air;
seventeenth step: after the molten metal in the product forming die is solidified, forming a metal ingot, then closing the externally connected vacuum pump, withdrawing the press head from the inner sleeve die, and lifting the press head to the original height;
and eighteenth step: the ejector rod of the press rises to drive the outer sleeve mold bottom plate to eject the inner sleeve mold out of the cavity of the outer sleeve mold;
the nineteenth step: turning the inner sleeve die by 180 degrees, and ejecting the metal ingot containing the product forming die from the inner sleeve die by a press;
the twentieth step: and sawing and demoulding the product forming mould, taking out the blank of the metal matrix ceramic composite material product, and machining the blank according to the product requirement to obtain the final product.
The further technical scheme is as follows:
in the first step, the ceramic reinforcement powder is diamond powder, silicon carbide powder or silicon powder.
The inner sleeve die is of a circular barrel structure, the inner portion of the inner sleeve die is a cavity, the inner cavity is formed by an upper straight line segment, a lower drawing oblique line segment and a bottom step opening, the top and the bottom of the inner sleeve die are provided with openings, a step is arranged at the bottom opening of the inner sleeve die, an inner sleeve die bottom plate is installed at the step in a matched mode, and the inner sleeve die bottom plate is clamped and cannot slide downwards.
The diameter of the bottom opening of the inner sleeve die is smaller than that of the top opening.
And a product forming die is placed in the cavity of the inner sleeve die, and meanwhile, the product forming die is placed on the bottom plate of the inner sleeve die.
The inner sleeve die is matched with the outer sleeve die, the diameter of the outer wall of the inner sleeve die is equal to that of the inner wall of the outer sleeve die, and the inner sleeve die is lifted through the ejector rod of the pressing machine, so that the bottom plate of the outer sleeve die moves up and down in the cavity of the outer sleeve die.
The middle part of the inner sleeve mold bottom plate is provided with a central hole, the middle part of the outer sleeve mold bottom plate is provided with a first through hole, the bottom surface of the outer sleeve mold bottom plate is provided with an upper half groove, one end of the workbench is provided with a second through hole, the upper surface of the workbench is provided with a lower half groove matched with the upper half groove, and the upper half groove, the lower half groove and the second through hole are combined into a vacuumizing channel.
The outer sleeve die is of a circular sleeve structure with the diameter of the base plate larger than that of the cylinder body.
The diameter of the bottom opening of the outer sleeve die is smaller than that of the inner wall of the cavity.
The disc-shaped outer cover die bottom plate is arranged at the bottom of the outer cover die, and the diameter of the outer cover die bottom plate is smaller than that of the outer wall of the inner cover die.
The invention has the following beneficial effects:
the invention has compact and reasonable structure and convenient operation, simplifies the technical process of preparing the prefabricated member, and avoids the problems of mold deformation, prefabricated member cracking, adhesive residue and the like.
According to the invention, the inner and outer sleeve dies are matched with each other, and the outer sleeve dies are heated during die casting, so that the temperature field and the solidification time of molten metal are regulated and controlled, and the molten metal can be ensured to uniformly permeate into gaps of ceramic particles in a molten state; the vacuum pumping is carried out from the bottom of the die while the high-pressure die casting is carried out, and the isolation measure of the metal liquid in the device and the outside air is ensured, so that the metal liquid can smoothly permeate downwards, and the permeability of the metal liquid is greatly improved.
The invention effectively realizes the control of defects in material die casting and effective exhaust, greatly improves the density, quality and performance of the composite material, can repeatedly utilize the die, and provides a new idea for the mass production of the metal-based ceramic composite material.
According to the invention, powder is directly filled into a product forming mold, so that the preparation process of a prefabricated part is omitted; the inner and outer sleeve dies are matched with each other, and the outer middle section of the outer sleeve die is heated by continuous high frequency during die casting so as to regulate and control the temperature field of the outer sleeve die; the inner sleeve die structure is added, the product forming die is arranged in the inner sleeve die, the inner sleeve die and the product forming die are heated and preheated together, molten metal is poured into the inner sleeve die during die-casting, so that the temperature of the metal inside and outside the product forming die is basically consistent during die-casting, the pressure inside and outside the die is basically equal, and the pressure head exerts pressure on the metal inside the inner sleeve die, thereby avoiding the deformation of the product forming die and the influence on the size precision of a die-casting product during die-casting, and avoiding the uneven osmotic pressure of the metal due to the large temperature difference of each part of the product forming die during die-casting, and further causing the inconsistent performance quality of each part of the product. The invention strictly controls the temperature of the molten metal poured into the inner sleeve mold, so that the molten metal infiltrates into the ceramic particles in a molten or semi-solid state, avoids adverse reaction products generated by the molten metal and ceramic particles (such as diamond, silicon and silicon carbide) at high temperature, effectively improves the quality of the composite material, and simultaneously increases the vacuum pumping channels at the bottoms of the inner sleeve mold and the outer sleeve mold, extends outwards along the radial direction of the contact surface of the bottom of the outer sleeve mold and the workbench, and finally penetrates through the bottom surface of the workbench to be exhausted to the vacuum pump. Therefore, negative pressure can be generated in gaps of ceramic particles in the die-casting process, and the isolation measure of the metal liquid in the device and the outside air is made to ensure the negative pressure effect. The metal liquid can be fully infiltrated into the gaps of the ceramic particles. Because the temperature of the molten metal part pressed by the pressure head is reduced consistently, the defects of pores and the like possibly generated by the material during die casting can be effectively controlled by pressure maintaining, the permeability of the molten metal in the gaps of the reinforcement is improved, the prepared composite material has high compactness and low porosity, and the quality and the performance of the product are greatly improved.
Drawings
Fig. 1 is a schematic structural view of a forming die after powder filling of the invention.
FIG. 2 is a schematic diagram of the operation of the sixth step of the present invention (front cross section)
FIG. 3 is a schematic side sectional view of the operation of the sixth step of the present invention.
FIG. 4 is a diagram illustrating the ninth step of the present invention.
FIG. 5 is a diagram illustrating the tenth operation of the present invention.
Fig. 6 is a schematic diagram illustrating the operation of the tenth step of the present invention.
FIG. 7 is a schematic diagram illustrating the operation of the twelfth step of the present invention.
Fig. 8 is a schematic diagram illustrating the operation of the thirteenth step of the present invention.
FIG. 9 is a diagram illustrating the operation of the fourteenth step of the present invention.
Fig. 10 is a schematic diagram illustrating the operation of the fifteenth step of the present invention.
Fig. 11 is an operation diagram of the eighteenth step of the present invention.
Fig. 12 is a schematic diagram illustrating the operation of the nineteenth step of the present invention.
Wherein: 1. powder material; 2. a product forming mold; 3. an inner sleeve die; 4. an inner sleeve mold bottom plate; 5. an outer cover die; 6. sheathing the mold bottom plate; 7. a mandril of the press; 8. a work table; 9. a molten metal; 10. an air extraction pipeline; 11. a pressure head; 12. a metal ingot; 13. a seal ring; 14. a channel; 15. a vacuum pump; 16. a high-frequency heater; 17. melting a molten metal;
401. a central bore;
601. a first through hole; 602. an upper half groove;
801. a lower half groove; 802. a second via.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 12, the manufacturing process of the present embodiment for preparing a metal matrix ceramic composite by hot isostatic pressing includes a product forming mold 2, an inner sleeve mold 3 and an outer sleeve mold 5,
the bottom of the inner sleeve die 3 is provided with an inner sleeve die bottom plate 4 in a matching way,
an outer sleeve mold bottom plate 6 capable of moving up and down is arranged at the bottom of the outer sleeve mold 5;
the specific process steps are as follows:
the first step is as follows: mixing and fully stirring a plurality of ceramic reinforcement powder with different particle sizes to prepare powder 1 to be filled;
the second step is that: all parts forming the product forming die 2 are disassembled, and a release agent is uniformly sprayed on the surface of each part;
the third step: assembling the parts of which the surfaces are uniformly coated with the release agent in the second step into a product forming die 2;
the fourth step: filling the fully stirred powder 1 into a cavity of a product forming die 2, and compacting the powder 1 in the product forming die 2 through vibration and extrusion;
the fifth step: uniformly spraying a release agent on the inner wall and the outer wall of the inner sleeve die 3 and the surface of the inner sleeve die bottom plate 4;
and a sixth step: placing a product forming die 2 filled with powder 1 on an inner sleeve die bottom plate 4 in a cavity of an inner sleeve die 3;
the seventh step: putting the inner sleeve mold 3 provided with the product forming mold 2 into a preheating furnace by using a forklift supporting clamp, preheating to 500-700 ℃, and preserving heat for 3-5 hours to uniformly heat the inner sleeve mold 3, the inner sleeve mold bottom plate 4, the product forming mold 2 and the powder 1;
eighth step: uniformly spraying a release agent on the inner wall of the outer sleeve mold 5, the bottom surface of the outer sleeve mold 5, the outer sleeve mold bottom plate 6 and the upper surface of the press ejector rod 7;
the ninth step: a high-frequency heater 16 is arranged outside the middle section of the outer sleeve die 5, the high-frequency heater 16 is started to work, and the middle section of the outer sleeve die 5 is heated at the temperature of 200-300 ℃;
the tenth step: lifting the press ejector rod 7, lifting the upper surface of the press ejector rod 7 to be higher than the upper surface of the outer sleeve mold 5, and then placing the outer sleeve mold bottom plate 6 on the upper surface of the press ejector rod 7;
the eleventh step: placing the preheated inner sleeve mold 3 provided with the product forming mold 2 on an outer sleeve mold bottom plate 6 by using a forklift to ensure the stability of the inner sleeve mold;
the twelfth step: the ejector rod 7 of the press is lowered, so that the outer sleeve mold bottom plate 6 and the inner sleeve mold 3 are slowly placed into the outer sleeve mold 5 along the inner wall of the outer sleeve mold 5, and the outer sleeve mold bottom plate 6 is in contact with the upper surface of the workbench 8;
the thirteenth step: injecting the pretreated molten metal 9 into the inner sleeve mold 3, controlling the pouring temperature of the molten metal 9 to be 100-200 ℃ above the melting point of the metal, and submerging the product forming mold 2 by the molten metal 9, namely the liquid level of the molten metal 9 exceeds the product forming mold 2;
the fourteenth step is that: the bottom of a channel 14 formed by the outer sleeve mold bottom plate 6 and the inner sleeve mold bottom plate 4 is connected with an air extraction pipeline 10, after the molten metal 9 is injected, an externally connected vacuum pump 15 is started, and the interior of the product forming mold 2 is vacuumized from the channel 14, so that negative pressure is generated in the product forming mold 2;
the fifteenth step: starting a press, reducing the pressure under a pressure head 11, feeding the metal liquid into the inner sleeve die 3, applying 50-120Mpa ultrahigh pressure on the metal liquid 9 to enable the metal liquid 9 to be fully impregnated into gaps of the powder 1, maintaining the pressure for 5-15 minutes, and maintaining the pressure until the metal liquid 9 is completely solidified;
sixteenth, step: when the molten metal infiltrates the gap between the powder 1, a U-shaped groove is formed in the linear section wall of the inner sleeve die 3, part of the molten metal 17 overflows through the U-shaped groove in the process of pressing down by the pressing head 11, and finally extends outwards to the upper part of the fit gap between the outer sleeve die 5 and the inner sleeve die 3, even permeates into the gap, and the fit gap between the inner sleeve die 3 and the outer sleeve die 5 is sealed after the molten metal is solidified, so that the whole annular fit gap is isolated from the outside air;
seventeenth step: after the molten metal 9 in the product forming die 2 is solidified, a metal ingot 12 is formed, then an externally connected vacuum pump 15 is closed, and a press head 11 of the press is withdrawn from the inner sleeve die 3 and lifted to the original height;
and eighteenth step: the ejector rod 7 of the press rises to drive the outer sleeve mold bottom plate 6 to eject the inner sleeve mold 3 out of the cavity of the outer sleeve mold 5;
the nineteenth step: turning the inner sleeve mold 3 for 180 degrees, and ejecting the metal ingot 12 containing the product forming mold 2 out of the inner sleeve mold 3 by a press;
the twentieth step: and (3) performing saw cutting and demoulding operation on the product forming mould 2, taking out the blank of the metal matrix ceramic composite material product, and machining the blank according to the product requirement to obtain the final product.
In the first step, the ceramic reinforcement powder is diamond powder, silicon carbide powder or silicon powder.
The diameter of the bottom opening of the inner shell mold 3 is smaller than that of the top opening.
A product forming die 2 is placed in a cavity of the inner sleeve die 3, and meanwhile, the product forming die 2 is placed on the inner sleeve die bottom plate 4.
The inner sleeve die 3 is matched with the outer sleeve die 5, the diameter of the outer wall of the inner sleeve die 3 is the diameter of the inner wall of the outer sleeve die 5, and the inner sleeve die 3 enables the outer sleeve die bottom plate 6 to move up and down in the cavity of the outer sleeve die 5 through the lifting of the ejector rod 7 of the press.
The middle part of the inner sleeve mold bottom plate 4 is provided with a central hole 401, the middle part of the outer sleeve mold bottom plate 6 is provided with a first through hole 601, the bottom surface of the outer sleeve mold bottom plate 6 is provided with an upper half groove 602, one end of the working table 8 is provided with a second through hole 802, the upper surface of the working table 8 is provided with a lower half groove 801 matched with the upper half groove 602, and the upper half groove 602, the lower half groove 801 and the second through hole 802 are combined into a vacuumizing channel 14.
The outer sleeve die 5 is a circular sleeve structure with a base plate diameter larger than the diameter of the cylinder body.
The diameter of the bottom opening of the outer sleeve die 5 is smaller than that of the inner wall of the cavity.
The disc-shaped outer cover die bottom plate 6 is arranged at the bottom of the outer cover die 5, and the diameter of the outer cover die bottom plate 6 is smaller than that of the outer wall of the inner cover die 3.
In the manufacturing process, the specific structure of the manufacturing device needed to be used is as follows:
comprises a product forming die 2, an inner sleeve die 3, an inner sleeve die bottom plate 4, an outer sleeve die 5, an outer sleeve die bottom plate 6, an air extractor and the like.
The product forming die 2 is placed on an inner sleeve die bottom plate 4 in an inner sleeve die 3 cavity, the inner sleeve die 3 with the product forming die 2 is placed on an outer sleeve die bottom plate 6 in an outer sleeve die 5 cavity through clamping of a forklift after preheating, the bottom surface of the outer sleeve die 5 is connected with the table surface of a press workbench 8, a sealing groove is formed between a press rod 7 and the workbench 8, a sealing ring 13 is placed in the sealing groove, air pumping channels are reserved in the radial direction of the contact surface of a press ejector rod 7 and the inner sleeve die 3, the bottom of the outer sleeve die 5, the outer sleeve die bottom plate 6 and the workbench 8 and in the thickness direction of the workbench 8, and the press ejector rod 7 can push the outer sleeve die bottom plate 6 to drive the inner sleeve die 3 to lift in the cavity of the outer sleeve die 5.
And molten metal 9 is poured into the cavity of the inner sleeve mold 3.
The inner sleeve die 3 is matched with the outer sleeve die 5, namely the diameter of the outer wall of the inner sleeve die 3 is the diameter of the inner wall of the outer sleeve die 5, and the inner sleeve die 3 can lift through the ejector rod 7 of the press, so that the outer sleeve die bottom plate 6 moves up and down in the cavity of the outer sleeve die 5.
The outer cover die 5 is of a circular sleeve structure with the diameter of a base plate larger than that of the cylinder body, the diameter of an opening at the bottom is slightly smaller than that of the inner wall of the cavity, and the diameter of a disc-shaped outer cover die bottom plate 6 placed at the bottom is smaller than that of the outer wall of the inner cover die 3.
The inner sleeve die 3 is a circular cylinder, the diameter of the bottom opening is smaller than that of the top opening, a stepped structure is arranged at the opening, an inner sleeve die bottom plate 4 with an edge inverted stepped structure is placed, and the inner sleeve die bottom plate 4 cannot slide downwards.
The linear section wall of the inner sleeve die 3 is provided with a U-shaped groove.
In the actual test process, the first embodiment:
the first step is as follows: mixing and fully stirring a plurality of ceramic reinforcement powder with different grain sizes according to a certain proportion to prepare powder 1 to be filled;
the second step is that: all parts forming the product forming die 2 are disassembled, and the surface of each part is uniformly sprayed with a release agent;
the third step: assembling the parts of which the surfaces are uniformly coated with the release agent in the second step into a product forming die 2;
the fourth step: filling the fully stirred powder 1 into a cavity of a product forming die 2, and compacting the powder 1 in the product forming die 2 through vibration and extrusion, as shown in figure 1;
the fifth step: uniformly spraying a release agent on the inner wall and the outer wall of the inner sleeve die 3 and the surface of the inner sleeve die bottom plate 4;
and a sixth step: placing a product forming die 2 filled with powder 1 on an inner sleeve die bottom plate 4 in a cavity of an inner sleeve die 3, as shown in figure 2;
the seventh step: the inner sleeve mold 3 with the product forming mold 2 is supported and clamped by a forklift, the lug lugs of the inner sleeve mold 3 are integrally placed into a preheating furnace together, the preheating is carried out to 500 ℃, the heat is preserved for three hours, and the inner sleeve mold 3, the inner sleeve mold bottom plate 4, the product forming mold 2 and the powder 1 are uniformly heated;
eighth step: uniformly spraying a release agent on the inner wall of the outer sleeve mold 5, the bottom surface of the outer sleeve mold 5, the outer sleeve mold bottom plate 6 and the upper surface of the press ejector rod 7;
the ninth step: a high-frequency heater 16 is arranged outside the middle section of the outer sleeve die 5, the high-frequency heater is started to work 16, and the middle section of the outer sleeve die is heated at the temperature of 200-300 ℃;
the tenth step: lifting the press ejector pins 7, lifting the upper surfaces of the press ejector pins 7 to be higher than the upper surfaces of the outer sleeve molds 5, and then placing the outer sleeve mold bottom plates 6 on the upper surfaces of the press ejector pins 7, as shown in FIG. 5;
the eleventh step: placing the preheated inner sleeve mold 3 provided with the product forming mold 2 on an outer sleeve mold bottom plate 6 by using a forklift to ensure the stability of the inner sleeve mold, as shown in figure 6;
the twelfth step: the mandril 7 of the press is lowered, so that the outer sleeve mold bottom plate 6 and the inner sleeve mold 3 are slowly placed into the outer sleeve mold 5 along the inner wall of the outer sleeve mold 5, and the outer sleeve mold bottom plate 6 is contacted with the upper surface of the workbench 8, as shown in figure 7;
the thirteenth step: injecting the pretreated molten metal 9 into the inner sleeve mold 3, controlling the pouring temperature of the molten metal 9 to be about 100 ℃ above the metal melting point, and enabling the molten metal 9 to submerge the product forming mold 2, namely enabling the liquid level of the molten metal 9 to exceed the product forming mold 2 and ensuring that a certain casting height of the molten metal 9 is achieved, as shown in fig. 8;
the fourteenth step is that: the bottom of a channel 14 formed by the outer sleeve mold bottom plate 6 and the inner sleeve mold bottom plate 4 is connected with an air extraction pipeline 10, after metal liquid 9 is injected, an externally connected vacuum pump 15 is started, and the interior of the product forming mold 2 is vacuumized from a bottom air passage, so that negative pressure is generated in the product forming mold 2, as shown in fig. 9;
the fifteenth step: starting a press (not shown in the figure), reducing the pressure of a pressure head 11 into the inner sleeve die 3, applying 50-120Mpa ultrahigh pressure to the molten metal 9 to enable the molten metal to be fully impregnated into the gaps of the powder 1, and maintaining the pressure until the molten metal 9 is completely solidified, as shown in figure 10;
sixteenth, step: when the molten metal infiltrates the gap between the powder 1, a U-shaped groove is formed in the linear section wall of the inner sleeve die 3, part of the molten metal 17 overflows through the U-shaped groove in the process of pressing down by the pressing head 11, and finally extends outwards to the upper part of the fit gap between the outer sleeve die 5 and the inner sleeve die 3, even permeates into the gap, and the fit gap between the inner sleeve die 3 and the outer sleeve die 5 is sealed after the molten metal is solidified, so that the whole annular fit gap is isolated from the outside air;
seventeenth step: after the molten metal 9 is solidified, the externally connected vacuum pump 15 is closed, the press head 11 of the press is withdrawn from the inner sleeve mold 3 and lifted to the original height;
and eighteenth step: the ejector rod 7 of the press rises to drive the outer sleeve mold bottom plate 6 to eject the inner sleeve mold 3 out of the cavity of the outer sleeve mold 5, as shown in figure 11;
the nineteenth step: turning the inner sleeve mold 3 over 180 degrees, ejecting the metal ingot 12 containing the product forming mold 2 from the inner sleeve mold 3 by a press, as shown in fig. 12;
the twentieth step: and (3) performing saw cutting and demoulding operation on the product forming mould 2, taking out the blank of the metal matrix ceramic composite material product, and machining the blank according to the product requirement to obtain the final product.
In the actual test process, example two:
the first step is as follows: mixing and fully stirring a plurality of ceramic reinforcement powder with different grain sizes according to a certain proportion to prepare powder 1 to be filled;
the second step is that: all parts forming the product forming die 2 are disassembled, and the surface of each part is uniformly sprayed with a release agent;
the third step: assembling the parts of which the surfaces are uniformly coated with the release agent in the second step into a product forming die 2;
the fourth step: filling the fully stirred powder 1 into a cavity of a product forming die 2, and compacting the powder 1 in the product forming die 2 through vibration and extrusion;
the fifth step: uniformly spraying a release agent on the inner wall and the outer wall of the inner sleeve die 3 and the surface of the inner sleeve die bottom plate 4;
and a sixth step: placing a product forming die 2 filled with powder 1 on an inner sleeve die bottom plate 4 in a cavity of an inner sleeve die 3;
the seventh step: the inner sleeve mold 3 with the product forming mold 2 is supported and clamped by a forklift, the lug lugs are integrally placed into a preheating furnace together, the preheating is carried out to 700 ℃, the heat preservation is carried out for 5 hours, and the inner sleeve mold 3, the inner sleeve mold bottom plate 4, the product forming mold 2 and the powder 1 are uniformly heated;
eighth step: uniformly spraying a release agent on the inner wall of the outer sleeve mold 5, the bottom surface of the outer sleeve mold 5, the outer sleeve mold bottom plate 6 and the upper surface of the press ejector rod 7;
the ninth step: a high-frequency heater 16 is arranged outside the middle section of the outer sleeve die 5, the high-frequency heater 16 is started to work, and the middle section of the outer sleeve die 5 is heated at the temperature of 200-300 ℃;
the tenth step: lifting the press ejector pins 7, lifting the upper surfaces of the press ejector pins 7 to be higher than the upper surfaces of the outer sleeve molds 5, and then placing the outer sleeve mold bottom plates 6 on the upper surfaces of the press ejector pins 7, as shown in FIG. 5;
the eleventh step: placing the preheated inner sleeve mold 3 provided with the product forming mold 2 on an outer sleeve mold bottom plate 6 by using a forklift to ensure the stability of the inner sleeve mold, as shown in figure 6;
the twelfth step: the mandril 7 of the press is lowered, so that the outer sleeve mold bottom plate 6 and the inner sleeve mold 3 are slowly placed into the outer sleeve mold 5 along the inner wall of the outer sleeve mold 5, and the outer sleeve mold bottom plate 6 is contacted with the upper surface of the workbench 8, as shown in figure 7;
the thirteenth step: injecting the pretreated molten metal 9 into the inner sleeve mold 3, controlling the pouring temperature of the molten metal 9 to be about 200 ℃ above the metal melting point, and enabling the molten metal 9 to submerge the product forming mold 2, namely enabling the liquid level of the molten metal 9 to exceed the product forming mold 2 and ensuring that a certain casting height of the molten metal 9 is achieved, as shown in fig. 8;
the fourteenth step is that: the bottom of a channel 14 formed by the outer sleeve mold bottom plate 6 and the inner sleeve mold bottom plate 4 is connected with an air extraction pipeline 10, after metal liquid 9 is injected, an externally connected vacuum pump 15 is started, and the interior of the product forming mold 2 is vacuumized from a bottom air passage, so that negative pressure is generated in the product forming mold 2, as shown in fig. 9;
the fifteenth step: starting a press (not shown in the figure), reducing the pressure of a pressure head 11 into the inner sleeve die 3, applying 50-120Mpa ultrahigh pressure to the molten metal 9 to enable the molten metal to be fully impregnated into the gaps of the powder 1, and maintaining the pressure until the molten metal 9 is completely solidified, as shown in figure 10;
sixteenth, step: when the molten metal infiltrates the gap between the powder 1, a U-shaped groove is formed in the linear section wall of the inner sleeve die 3, part of the molten metal 17 overflows through the U-shaped groove in the process of pressing down by the pressing head 11, and finally extends outwards to the upper part of the fit gap between the outer sleeve die 5 and the inner sleeve die 3, even permeates into the gap, and the fit gap between the inner sleeve die 3 and the outer sleeve die 5 is sealed after the molten metal is solidified, so that the whole annular fit gap is isolated from the outside air;
seventeenth step: after the molten metal 9 is solidified, the externally connected vacuum pump 15 is closed, the press head 11 of the press is withdrawn from the inner sleeve mold 3 and lifted to the original height;
and eighteenth step: the ejector rod 7 of the press rises to drive the outer sleeve mold bottom plate 6 to eject the inner sleeve mold 3 out of the cavity of the outer sleeve mold 5, as shown in figure 11;
the nineteenth step: turning the inner sleeve mold 3 over 180 degrees, ejecting the metal ingot 12 containing the product forming mold 2 from the inner sleeve mold 3 by a press, as shown in fig. 12;
the twentieth step: and (3) performing saw cutting and demoulding operation on the product forming mould 2, taking out the blank of the metal matrix ceramic composite material product, and machining the blank according to the product requirement to obtain the final product.
In the actual test process, the third example:
the first step is as follows: mixing and fully stirring a plurality of ceramic reinforcement powder with different grain sizes according to a certain proportion to prepare powder 1 to be filled;
the second step is that: all parts forming the product forming die 2 are disassembled, and the surface of each part is uniformly sprayed with a release agent;
the third step: assembling the parts of which the surfaces are uniformly coated with the release agent in the second step into a product forming die 2;
the fourth step: filling the fully stirred powder 1 into a cavity of a product forming die 2, and compacting the powder 1 in the product forming die 2 through vibration and extrusion;
the fifth step: uniformly spraying a release agent on the inner wall and the outer wall of the inner sleeve die 3 and the surface of the inner sleeve die bottom plate 4;
and a sixth step: placing a product forming die 2 filled with powder 1 on an inner sleeve die bottom plate 4 in a cavity of an inner sleeve die 3;
the seventh step: the inner sleeve mold 3 with the product forming mold 2 is supported and clamped by a forklift, the lug of the inner sleeve mold 3 is integrally placed into a preheating furnace, the preheating is carried out to 650 ℃, the heat preservation is carried out for 4 hours, and the inner sleeve mold 3, the inner sleeve mold bottom plate 4, the product forming mold 2 and the powder 1 are uniformly heated;
eighth step: uniformly spraying a release agent on the inner wall of the outer sleeve mold 5, the bottom surface of the outer sleeve mold 5, the outer sleeve mold bottom plate 6 and the upper surface of the press ejector rod 7;
the ninth step: a high-frequency heater is arranged outside the middle section of the outer sleeve mold, the high-frequency heater is started to work, and the middle section of the outer sleeve mold is heated at the temperature of 200-300 ℃;
the tenth step: lifting the press ejector rod 7, lifting the upper surface of the press ejector rod 7 to be higher than the upper surface of the outer sleeve mold 5, and then placing the outer sleeve mold bottom plate 6 on the upper surface of the press ejector rod 7;
the eleventh step: placing the preheated inner sleeve mold 3 provided with the product forming mold 2 on an outer sleeve mold bottom plate 6 by using a forklift to ensure the stability of the inner sleeve mold;
the twelfth step: the mandril 7 of the press is lowered, so that the outer sleeve mold bottom plate 6 and the inner sleeve mold 3 are slowly placed into the outer sleeve mold 5 along the inner wall of the outer sleeve mold 5, and the outer sleeve mold bottom plate 6 is contacted with the upper surface of the workbench 8, as shown in figure 6;
the thirteenth step: injecting the pretreated molten metal 9 into the inner sleeve mold 3, controlling the pouring temperature of the molten metal 9 to be about 150 ℃ above the metal melting point, and submerging the product forming mold 2 by the molten metal 9, namely ensuring that the liquid level of the molten metal 9 exceeds the product forming mold 2 and ensuring that a certain die-casting height of the molten metal 9 is achieved;
the fourteenth step is that: the bottom of a channel 14 formed by the outer sleeve mold bottom plate 6 and the inner sleeve mold bottom plate 4 is connected with an air extraction pipeline 10, after metal liquid 9 is injected, an externally connected vacuum pump 15 is started, and the interior of the product forming mold 2 is vacuumized from a bottom air passage, so that negative pressure is generated in the product forming mold 2;
the fifteenth step: starting a press (not shown in the figure), reducing the pressure into the inner sleeve die 3 by a pressure head 11, applying 50-120Mpa ultrahigh pressure to the molten metal 9 to enable the molten metal to be fully impregnated into the gaps of the powder 1, and maintaining the pressure until the molten metal 9 is completely solidified;
sixteenth, step: when the molten metal infiltrates the gap between the powder 1, a U-shaped groove is formed in the linear section wall of the inner sleeve die 3, part of the molten metal 17 overflows through the U-shaped groove in the process of pressing down by the pressing head 11, and finally extends outwards to the upper part of the fit gap between the outer sleeve die 5 and the inner sleeve die 3, even permeates into the gap, and the fit gap between the inner sleeve die 3 and the outer sleeve die 5 is sealed after the molten metal is solidified, so that the whole annular fit gap is isolated from the outside air;
seventeenth step: after the molten metal 9 is solidified, the externally connected vacuum pump 15 is closed, the press head 11 of the press is withdrawn from the inner sleeve mold 3 and lifted to the original height;
and eighteenth step: the ejector rod 7 of the press rises to drive the outer sleeve mold bottom plate 6 to eject the inner sleeve mold 3 out of the cavity of the outer sleeve mold 5;
the nineteenth step: turning the inner sleeve mold 3 for 180 degrees, and ejecting the metal ingot 12 containing the product forming mold 2 out of the inner sleeve mold 3 by a press;
the twentieth step: and (3) performing saw cutting and demoulding operation on the product forming mould 2, taking out the blank of the metal matrix ceramic composite material product, and machining the blank according to the product requirement to obtain the final product.
By the process method, the defects of air holes and the like possibly generated by the material during die casting can be effectively controlled, the permeability of the molten metal in the gaps of the reinforcement is improved, the prepared composite material has high compactness and low air hole rate, and the quality and the performance of the product are greatly improved.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (10)
1. A manufacturing process for preparing a metal matrix ceramic composite material by hot isostatic pressing is characterized in that: comprises a product forming die (2), an inner sleeve die (3) and an outer sleeve die (5),
the bottom of the inner sleeve die (3) is provided with an inner sleeve die bottom plate (4) in a matching way,
an outer sleeve mold bottom plate (6) capable of moving up and down is arranged at the bottom of the outer sleeve mold (5);
the specific process steps are as follows:
the first step is as follows: mixing and fully stirring a plurality of ceramic reinforcement powder with different particle sizes to prepare powder (1) to be filled;
the second step is that: all parts forming the product forming die (2) are disassembled, and a release agent is uniformly sprayed on the surface of each part;
the third step: assembling the parts of which the surfaces are uniformly coated with the release agent in the second step into a product forming die (2);
the fourth step: filling the fully stirred powder (1) into a cavity of a product forming die (2), and compacting the powder (1) in the product forming die (2) through vibration and extrusion;
the fifth step: uniformly spraying a release agent on the inner wall and the outer wall of the inner sleeve die (3) and the surface of the inner sleeve die bottom plate (4);
and a sixth step: placing a product forming die (2) filled with the powder (1) on an inner sleeve die bottom plate (4) in a cavity of an inner sleeve die (3);
the seventh step: putting the inner sleeve mold (3) provided with the product forming mold (2) into a preheating furnace together by using a forklift supporting clamp, preheating to the temperature of 500-;
eighth step: uniformly spraying a release agent on the inner wall of the outer sleeve mold (5), the bottom surface of the outer sleeve mold (5), the outer sleeve mold bottom plate (6) and the upper surface of the press ejector rod (7);
the ninth step: a high-frequency heater (16) is externally arranged at the middle section of the outer sleeve die (5), the high-frequency heater (16) is started to work, and the middle section of the outer sleeve die (5) is heated at the temperature of 200-300 ℃;
the tenth step: lifting the press ejector rod (7), lifting the upper surface of the press ejector rod (7) to be higher than the upper surface of the outer sleeve mold (5), and then placing the outer sleeve mold bottom plate (6) on the upper surface of the press ejector rod (7);
the eleventh step: placing the preheated inner sleeve die (3) provided with the product forming die (2) on the outer sleeve die bottom plate (6) by a forklift to ensure the stability of the inner sleeve die;
the twelfth step: a press ejector rod (7) is lowered, so that the outer sleeve mold bottom plate (6) and the inner sleeve mold (3) are slowly placed into the outer sleeve mold (5) along the inner wall of the outer sleeve mold (5), and the outer sleeve mold bottom plate (6) is in contact with the upper surface of the workbench (8);
the thirteenth step: injecting the pretreated molten metal (9) into the inner sleeve mold (3), controlling the pouring temperature of the molten metal (9) to be 100-200 ℃ above the melting point of the metal, and submerging the product forming mold (2) by the molten metal (9), namely the liquid level of the molten metal (9) exceeds the product forming mold (2);
the fourteenth step is that: the bottom of a channel (14) formed by the outer sleeve mold bottom plate (6) and the inner sleeve mold bottom plate (4) is connected with an air suction pipeline (10), after molten metal (9) is injected, an externally connected vacuum pump (15) is started, and the interior of the product forming mold (2) is vacuumized from the channel (14), so that negative pressure is generated in the product forming mold (2);
the fifteenth step: starting a press, reducing the pressure of a pressure head (11) into the inner sleeve die (3), applying 50-120Mpa ultrahigh pressure to the molten metal (9) to fully infiltrate the molten metal (9) into the gaps of the powder (1), maintaining the pressure for 5-15 minutes, and maintaining the pressure until the molten metal (9) is completely solidified;
sixteenth, step: when the molten metal infiltrates into the gaps of the powder (1), the wall of the linear section of the inner sleeve die (3) is provided with a U-shaped groove, part of the molten metal (17) overflows through the U-shaped groove in the process of pressing down by the pressing head (11), and finally extends outwards to the upper part of the fit gap between the outer sleeve die (5) and the inner sleeve die (3) and even infiltrates into the gaps, and the fit gap between the inner sleeve die (3) and the outer sleeve die (5) is sealed after the molten metal of the part solidifies, so that the whole annular fit gap is isolated from the outside air;
seventeenth step: after the molten metal (9) in the product forming die (2) is solidified, a metal ingot (12) is formed, then a vacuum pump (15) connected with the outside is closed, and a press head (11) of a press is withdrawn from the inner sleeve die (3) and lifted to the original height;
and eighteenth step: the ejector rod (7) of the press rises to drive the outer sleeve mold bottom plate (6) to eject the inner sleeve mold (3) out of the cavity of the outer sleeve mold (5);
the nineteenth step: turning the inner sleeve die (3) for 180 degrees, and ejecting a metal ingot (12) containing the product forming die (2) from the inner sleeve die (3) by a press;
the twentieth step: and (3) performing saw cutting and demoulding operation on the product forming die (2), taking out a blank of the metal matrix ceramic composite material product, and machining the blank according to the product requirement to obtain the final product.
2. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: in the first step, the ceramic reinforcement powder is diamond powder, silicon carbide powder or silicon powder.
3. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: inner sleeve mould (3) are circular barrel structure, and inside is the cavity, and inside cavity passes through upper portion straightway and lower part draft diagonal segment and bottom ladder opening and constitutes, and the top and the bottom of inner sleeve mould (3) all are provided with the opening, inner sleeve mould (3) bottom opening part is provided with the ladder, and inner sleeve mould bottom plate (4) are installed in ladder department cooperation, and inner sleeve mould bottom plate (4) block, can not the landing downwards.
4. The process of claim 3, wherein the hot isostatic pressing produces a metal matrix ceramic composite material, and wherein: the diameter of the bottom opening of the inner sleeve die (3) is smaller than that of the top opening.
5. The process of claim 3, wherein the hot isostatic pressing produces a metal matrix ceramic composite material, and wherein: a product forming die (2) is placed in a cavity of the inner sleeve die (3), and meanwhile, the product forming die (2) is placed on the inner sleeve die bottom plate (4).
6. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: the inner cover die (3) is matched with the outer cover die (5), the diameter of the outer wall of the inner cover die (3) is the diameter of the inner wall of the outer cover die (5), and the inner cover die (3) enables the outer cover die bottom plate (6) to move up and down in the cavity of the outer cover die (5) through the lifting of the press ejector rod (7).
7. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: the middle part of endotheca mould bottom plate (4) is opened there is centre bore (401), and open in the centre of overcoat mould bottom plate (6) has first through-hole (601), and open the bottom surface of overcoat mould bottom plate (6) has first recess (602), and open the one end of workstation (8) has second through-hole (802), and open the upper surface of workstation (8) has lower half recess (801) that matches with first recess (602), lower half recess (801), second through-hole (802) make up into evacuation passageway (14).
8. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: the outer sleeve die (5) is of a circular sleeve structure with the diameter of the base plate larger than that of the cylinder body.
9. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: the diameter of the bottom opening of the outer sleeve die (5) is smaller than that of the inner wall of the cavity.
10. The process of claim 1, wherein the hot isostatic pressing produces a metal matrix ceramic composite, and wherein: the disc-shaped outer sleeve mold bottom plate (6) is arranged at the bottom of the outer sleeve mold (5), and the diameter of the outer sleeve mold bottom plate (6) is smaller than that of the outer wall of the inner sleeve mold (3).
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