CN112589095A - High-flux preparation method of gravity-infiltrated iron-based composite material preform - Google Patents
High-flux preparation method of gravity-infiltrated iron-based composite material preform Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
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- 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
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1103—Making porous workpieces or articles with particular physical characteristics
- B22F3/1115—Making porous workpieces or articles with particular physical characteristics comprising complex forms, e.g. honeycombs
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1143—Making porous workpieces or articles involving an oxidation, reduction or reaction step
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
Abstract
The invention discloses a high-flux preparation method of a gravity infiltration iron-based composite material preform, which comprises the steps of soaking ceramic particles plated with a metal layer in acetone, cleaning and drying, mixing the dried ceramic particles and metal powder by using a PVA (polyvinyl alcohol) aqueous solution, and then putting into a graphite mold for drying; and sequentially stacking the graphite molds and then carrying out high-throughput sintering treatment to obtain the ceramic particle prefabricated body. The invention improves the production efficiency and the surface quality and is beneficial to casting the prefabricated body.
Description
Technical Field
The invention belongs to the technical field of wear-resistant material preparation, and particularly relates to a high-flux preparation method of a gravity infiltration iron-based composite material preform.
Background
The high-chromium cast iron is called as a third-generation wear-resistant material due to the characteristics of outstanding performance and high cost performance, can be quickly popularized and applied in industrial and agricultural application, and has a remarkable tendency of accelerating the increase of the yield. However, the mutual restriction of the wear resistance and the toughness of the traditional material greatly limits the further improvement of the wear resistance. This has also led us to open new thinking to find materials with higher wear resistance. The introduction of wear-resistant reinforcement on the surface of metal to prepare high wear-resistant composite materials is receiving more and more attention from researchers.
For example, the preparation of ZTA ceramic particles (i.e., zirconia toughened alumina ceramic) reinforced iron-based composites is one of the research hotspots in recent years. The ZTA ceramic particles have good wear resistance, low cost and wide source, and the zirconium oxide has the characteristic of phase change self-toughening, which is beneficial to improving the fracture resistance of the aluminum oxide ceramic. The ceramic particle reinforced iron-based composite material combining the ZTA particles and the iron matrix can fully play the toughness characteristic of the metal matrix and the high hardness and high wear resistance characteristics of the ceramic particles, greatly improve the wear resistance of a workpiece, and after a certain amount of friction and wear processes, the protruded ceramic particles can form a shadow effect due to certain toughness, so that the iron matrix is protected from severe friction and wear, the loss of instruments is reduced, and the service life of equipment is prolonged.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a high-flux preparation method of a gravity infiltration iron-based composite material preform, aiming at the problems of insufficient metal infiltration, low preform production efficiency and the like which are possibly encountered when a ceramic preform of a ceramic reinforced metal-based composite material is prepared. The high-flux die for preparing the prefabricated body is designed, so that the preparation efficiency and effect of the prefabricated body are improved.
The invention adopts the following technical scheme:
a high-flux preparation method of a gravity infiltration iron-based composite material preform comprises the steps of soaking ceramic particles plated with metal layers in acetone, cleaning and drying, mixing the dried ceramic particles and metal powder by using a PVA aqueous solution, and then putting the mixture into a graphite mold for drying; and sequentially stacking the graphite molds and then carrying out high-throughput sintering treatment to obtain the ceramic particle prefabricated body.
Specifically, the ceramic particles plated with the metal layers are soaked in acetone for 10-20 min, ultrasonic cleaning is adopted for 5-10 min, then cleaning is carried out sequentially by deionized water and alcohol, the temperature of drying treatment after cleaning is 100 ℃, and the time is 3 h.
Specifically, the concentration of the PVA aqueous solution is 10g/100ml, and the amount of the PVA aqueous solution accounts for 10-30% of the mass fraction of the metal powder.
Specifically, the total mass of the metal powder accounts for 15-30% of the mass fraction of the ceramic particles.
Further, the metal powder comprises nickel powder and nickel-titanium alloy powder, and the molar ratio of the nickel powder to the nickel-titanium alloy powder is 1: 1.
specifically, the graphite mold is a four-hole honeycomb structure.
Furthermore, the aperture of the four-hole honeycomb structure is 10-20 mm, the center distance between holes is 20-30 mm, and the size of the inner cavity is 80mm multiplied by 30 mm.
Specifically, the graphite molds are stacked in sequence and then placed in a graphite crucible for high-flux sintering treatment.
Further, the graphite crucible is of a rectangular parallelepiped structure, the inner dimension of the graphite crucible is 500mm × 450mm × 300mm, the wall thickness is 20mm, and 30 ceramic particle preforms can be sintered.
Specifically, the sintering treatment temperature is increased by 30 ℃ from the melting point of the metal powder, the heat preservation temperature is 1400-1450 ℃, the heat preservation time is 1.5-2 hours, and high-purity argon is introduced, wherein the gas flow rate is 15-20 ml/min.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the invention, by using a high-flux preparation technology of a gravity infiltration iron-based composite material preform, the ceramic particles plated with the metal layer and the metal powder are sintered into a preform with certain strength, so that the preparation efficiency of the preform can be greatly improved, meanwhile, the atmosphere protection can prevent the metal powder from being oxidized, a reliable sintering neck can be formed between the ceramic particles, and the production quality and stability of the product can be ensured by the same process parameters.
Furthermore, acetone is adopted for soaking and cleaning, and the purpose is to degrease and dehydrate the surface of the ceramic particles, keep the surface clean, reduce impurities in subsequent treatment and be beneficial to forming a compact sintering mechanism in the sintering process.
Further, the PVA aqueous solution with the concentration of 10g/100ml is used, the main purpose is to help the metal powder to be uniformly attached to the surface of the ceramic particles in advance, and the foaming effect during preheating can generate pores to facilitate the infiltration of the molten iron.
Furthermore, the design amount of the metal powder is 15-30% of the mass fraction of the ceramic particles, so that the ceramic particles are better connected, the content is too high, the mixing of the powder and the particles is not facilitated, and the particles cannot be adhered to each other if the content is too low.
Furthermore, the metal powder is selected from nickel powder and nickel-titanium alloy powder, so as to supplement the nickel content of the nickel-plated ceramic particles, and simultaneously, Ni with good performance is generated by reaction according to a certain proportion during sintering3Ti。
Further, graphite jig sets up to four holes honeycomb structure, and its purpose is in order to prepare four holes prefabricated part, and the hole be provided with and do benefit to the infiltration of molten iron, and the prefabricated part that does not leave the hole can't fully contact with the molten iron, influences the casting effect.
Further, the size of the four-hole honeycomb is designed in consideration of the actual application size and the casting process. Too large holes are not beneficial to forming enough shadow effect, the abrasion resistance is poor, too small holes are not beneficial to infiltration of molten iron, and the pinning effect is weak.
Furthermore, the graphite crucible is placed after the graphite molds are stacked, so that the sintering efficiency can be improved, a plurality of prefabricated bodies are prepared simultaneously, and the graphite crucible is placed to ensure that the sintering is not interfered by other impurities in the sintering furnace and the sintering quality is ensured.
Furthermore, the design of the size structure of the graphite crucible is convenient for stacking of the four-hole prefabricated graphite mould and sintering.
Furthermore, the temperature selection of the sintering treatment is determined by referring to a nickel-titanium phase diagram, and the nickel-titanium can form a stable intermetallic compound Ni at about 1450 DEG C3Ti, so as to improve the bonding strength with molten iron and produce metallurgical bonding.
In conclusion, the invention improves the production efficiency and the surface quality and is beneficial to casting the prefabricated body.
The technical solution of the present invention is further described in detail by the following examples.
Detailed Description
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The invention provides a high-flux preparation method for a gravity infiltration iron-based composite material preform. The invention relates to a novel process for sintering a ceramic preform with high flux, which is characterized in that ceramic particles plated with metal are sintered by controlling the sintering temperature and the sintering atmosphere to prepare a preform with certain strength, the production efficiency of composite material preparation is improved, the process operation is simple, and the cost is greatly reduced, so that the novel process has good application prospect and development space in the wear-resistant field.
The invention relates to a high-flux preparation method of a gravity-infiltrated iron-based composite material preform, which comprises the following steps of:
s1, soaking the ceramic particles plated with the metal layer in acetone, then ultrasonically cleaning, then cleaning with deionized water, washing with alcohol, and finally drying in an electric heating constant-temperature air blast drying oven;
soaking the ceramic particles in acetone for 10-20 min, and then ultrasonically cleaning for 5-10 min; then washing with deionized water, washing with alcohol, and drying at 100 deg.C for 3 hr.
S2, mixing metal powder and ceramic particles coated with metal layers according to a certain proportion by using a PVA (polyvinyl alcohol) aqueous solution, putting the mixture into a graphite mould, and drying the mixture in a drying oven;
the concentration of the PVA aqueous solution is 10g/100ml, the specific use can be adjusted according to the actual condition of the metal powder, the solution consumption accounts for 10-30% of the mass fraction of the metal powder, the graphite mould is a special four-hole honeycomb mould, the aperture is 10-20 mm, the center distance between holes is 20-30 mm, the size of the inner cavity of the mould is 80mm multiplied by 30mm, the drying temperature is 300 ℃, and the time is 1 h.
The metal powder is nickel powder and nickel-titanium alloy powder according to the molar ratio of 1: 1, the dosage of the mixed powder accounts for 15-30 percent of the mass fraction of the ceramic particles, and the preferred dosage is 20 percent.
And S3, sequentially stacking the graphite molds filled with the ceramic particles, putting the graphite molds into a graphite crucible, and sintering the graphite molds by using high-throughput equipment according to specific requirements to obtain the ceramic particle preform.
The graphite crucible is a cuboid with the internal dimension of 500mm multiplied by 450mm multiplied by 300mm and the wall thickness of 20mm, and 30 ceramic particle preforms can be sintered simultaneously.
The sintering temperature is increased by 30 ℃ on the basis of the melting point of the metal powder, and high-purity argon is introduced to protect the metal layer on the surface of the ceramic particles from being oxidized. The high-flux preparation method of the gravity infiltration iron-based composite material preform can greatly improve the preparation efficiency of the preform and obtain the preform which is tightly combined, firm and reliable.
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 15 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1450 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 1 has a loose structure, a part of the regions are bonded densely and have a certain strength, and a part of the regions are not bonded tightly, and when metal powder and ceramic particles are mixed, the metal powder cannot uniformly cover all the particles, so that the bonding strength is not high.
Example 2
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 20 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1450 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 2 has a compact structure and a certain strength, and when the metal powder and the ceramic particles are mixed, the metal powder can uniformly cover all the particles, and sintering necks between macro-morphology particles are obvious.
Example 3
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 25 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1450 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 3 has a dense structure and appropriate strength, and when the metal powder and the ceramic particles are mixed, the metal powder can uniformly cover all the particles, and sintering necks between macro-morphology particles are significant.
Example 4
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 30 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1450 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 4 has a dense structure and a high strength, but when the metal used for bonding is sintered, the metal in a molten state is gathered at the bottom of the preform under the action of gravity, resulting in uneven distribution, when the metal powder and the ceramic particles are mixed, the metal powder is not easy to uniformly cover all the particles, and when the metal powder is left to stand, the metal powder is moved downward under the action of gravity.
Example 5
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 15 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1400 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 5 has a loose structure, a part of the regions are bonded densely and have a certain strength, and a part of the regions are not bonded tightly, and when the metal powder and the ceramic particles are mixed, the metal powder does not uniformly cover all the particles, so that the bonding strength is not high.
Example 6
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 20 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1400 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 6 has a compact structure and low strength, and when metal powder and ceramic particles are mixed, the metal powder can uniformly cover all the particles, and sintering necks between macro-morphology particles are obvious.
Example 7
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 25 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1400 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 7 has a compact structure and moderate strength, and when metal powder and ceramic particles are mixed, the metal powder can uniformly cover all the particles, and sintering necks between macro-morphology particles are obvious.
Example 8
1) Soaking ZTA ceramic particles plated with Ni and Ti layers in acetone for 20min, ultrasonically cleaning for 15min, cleaning with deionized water, washing with alcohol, and drying in an electrothermal constant temperature blast drying oven;
2) uniformly stirring metal powder with 30 mass percent of ceramic particles and a proper amount of PVA solution to form paste, putting the ceramic particles into the paste, uniformly stirring, putting the paste into a graphite mold together, compacting and drying;
3) stacking the graphite molds containing the preforms in sequence according to requirements, placing the graphite molds into a graphite crucible, and treating the graphite molds by using a high-flux atmosphere protection heat treatment furnace;
4) setting the heat preservation temperature at 1400 ℃ and the heat preservation time at 2h, sintering the preform under the protection of argon, wherein the gas flow rate is 20ml/min, and obtaining the tightly combined ceramic preform.
The ceramic preform obtained in example 8 has a compact structure and moderate strength, but when the metal used for bonding is sintered, the metal in a molten state is gathered at the bottom of the preform under the action of gravity, resulting in uneven distribution, when the metal powder and the ceramic particles are mixed, the metal powder is not easy to uniformly cover all the particles, and when the metal powder is left standing, the metal powder is moved downward under the action of gravity.
In conclusion, according to the high-flux preparation method of the gravity infiltration iron-based composite material preform, the strength of the preform can be improved due to the fact that the sintering temperature is higher, the proportion of the metal powder is properly selected to be 25%, the adhesion of the ceramic particles is not facilitated due to too low proportion, and the powder can be gathered at the bottom of the preform due to too high proportion.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A high-flux preparation method of a gravity infiltration iron-based composite material preform is characterized in that ceramic particles plated with a metal layer are placed in acetone for soaking, then are cleaned and dried, and a PVA aqueous solution is used for mixing the dried ceramic particles and metal powder and then placing the mixture into a graphite mold for drying; and sequentially stacking the graphite molds and then carrying out high-throughput sintering treatment to obtain the ceramic particle prefabricated body.
2. The method according to claim 1, wherein the ceramic particles coated with the metal layer are soaked in acetone for 10-20 min, ultrasonic cleaning is performed for 5-10 min, then cleaning is performed sequentially with deionized water and alcohol, and the temperature of the drying treatment after cleaning is 100 ℃ and the time is 3 h.
3. The method according to claim 1, wherein the concentration of the aqueous PVA solution is 10g/100ml, and the amount of the aqueous PVA solution is 10-30% by mass of the metal powder.
4. The method of claim 1, wherein the total mass of the metal powder comprises between 15% and 30% of the mass fraction of the ceramic particles.
5. The method of claim 4, wherein the metal powder comprises nickel powder and nickel-titanium alloy powder, and the molar ratio of nickel powder to nickel-titanium alloy powder is 1: 1.
6. the method of claim 1, wherein the graphite mold is a four-hole honeycomb structure.
7. The method of claim 6, wherein the four-hole honeycomb structure has a hole diameter of 10 to 20mm, a center-to-center distance between holes of 20 to 30mm, and an inner cavity size of 80mm x 30 mm.
8. The method of claim 1, wherein the graphite molds are sequentially stacked and then placed in a graphite crucible for a high-throughput sintering process.
9. The method as claimed in claim 8, wherein the graphite crucible has a rectangular parallelepiped structure, has an inner size of 500mm x 450mm x 300mm and a wall thickness of 20mm, and is capable of sintering 30 ceramic particle preforms.
10. The method according to claim 1, wherein the sintering temperature is 30 ℃ higher than the melting point of the metal powder, the holding temperature is 1400-1450 ℃, the holding time is 1.5-2 h, and high-purity argon is introduced at a gas flow rate of 15-20 ml/min.
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