CN115255354A - Preparation method of high-chromium cast iron wear-resistant material with ordered structure - Google Patents
Preparation method of high-chromium cast iron wear-resistant material with ordered structure Download PDFInfo
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- CN115255354A CN115255354A CN202211187387.7A CN202211187387A CN115255354A CN 115255354 A CN115255354 A CN 115255354A CN 202211187387 A CN202211187387 A CN 202211187387A CN 115255354 A CN115255354 A CN 115255354A
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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
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- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22D23/04—Casting by dipping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
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Abstract
The invention discloses a preparation method of a high-chromium cast iron wear-resistant material with an ordered structure, which comprises the following steps: 1. selecting raw materials; 2. adding absolute ethyl alcohol and PVB binder into Ti 2 Stirring AlC powder to obtain a mixture; 3. extrusion forming; 4. drying and then sintering and forming; 5. and placing mixed powder of the high-chromium cast iron powder and the alloying ZTA powder on the surface of the ordered porous preform for pressureless infiltration to obtain the high-chromium cast iron wear-resistant material with the ordered structure. The invention passes through Ti 2 The Al C powder is decomposed in situ to form a fixed MX framework, and the large-size alloying ZTA powder is difficult to pass through MX framework pores, so that the orderly distribution of a reinforcing phase in the high-chromium cast iron is realized, and different regions are naturally transited and tightly combinedAnd the MX skeleton and ZTA particles are orderly distributed to play a role in enhancing, so that the fracture resistance of the high-chromium cast iron wear-resistant material with the ordered structure is improved.
Description
Technical Field
The invention belongs to the technical field of preparation of high-strength wear-resistant materials, and particularly relates to a preparation method of a high-chromium cast iron wear-resistant material with an ordered structure.
Background
High chromium cast iron due to high hardness of M 7 C 3 The presence of carbides such as (M: fe, cr) makes them excellent wear-resistant materials, and they are widely used for parts such as roll sleeves and lining plates in equipment such as vertical mills and high-pressure roll mills. However, in the preparation of high-chromium cast iron, M 7 C 3 The high-chromium cast iron grows quickly and is easy to become thick, so that the toughness of the high-chromium cast iron is reduced. While MAX phase is like Ti 3 AlC 2 Preparing uniform composite material with high-chromium cast iron, ti 3 AlC 2 In situ decomposition to form TiC x Can inhibit M very effectively 7 C 3 The microstructure of the high-chromium cast iron is refined, so that the comprehensive performance of the high-chromium cast iron is obviously improved, but the uniform composite material has more ceramic consumption and higher cost. Ordered structure materials such as honeycomb composites can achieve wear resistance substantially the same as that of the whole layer of composite, but greatly save the use amount of ceramic particles, thereby greatly saving the cost. The composite material with the ordered structure can be prepared through a series of operations such as die extrusion, infiltration and the like. Besides saving cost, the ordered structure can also prevent the problem of failure of integral fracture easily caused by a single structure; the infiltration capacity of the chromium cast iron can be greatly improved by the macropores reserved in the prefabricated part prepared in advance by a die extrusion method; the structure has designability according to the use requirement and is not limited to a fixed structure; such anisotropic structures show great potential in thermophysical and mechanical properties compared to isotropic reinforcement materials. In the prior art, the combination of ceramic reinforced phase particles and a high-chromium cast iron matrix is weak, so that the use safety is poor, and the preparation process for orderly distributing the reinforced phase in a specific area is complex, so that the requirements in actual production are difficult to meet.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a high-chromium cast iron wear-resistant material with an ordered structure aiming at the defects of the prior art. The method uses Ti 2 AlC powderPreparing ordered porous prefabricated body, placing the mixed powder of high-chromium cast iron powder and alloyed ZTA powder on its surface and making pressureless infiltration to make Ti 2 AlC powder is decomposed into a fixed TiC skeleton in situ, high-chromium cast iron powder is melted and infiltrated into pores of the ordered porous preform to form a matrix, and alloyed ZTA powder is distributed in a specific area in a prefabricated macropore of the ordered porous preform, so that the ordered distribution of a TiC reinforcing phase and a ZTA reinforcing phase in high-chromium cast iron is realized, and the problem of uneven distribution of the reinforcing phases is solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preparation method of a high-chromium cast iron wear-resistant material with an ordered structure is characterized by comprising the following steps:
step one, selecting Ti 2 AlC powder, absolute ethyl alcohol, PVB binder, high-chromium cast iron powder and alloying ZTA powder are taken as raw materials; the grain size of the alloying ZTA powder is 0.2mm-2mm;
step two, mixing and stirring the absolute ethyl alcohol in the raw materials in the step one and the PVB binder until the PVB binder is completely dissolved, and then adding Ti 2 Continuously stirring the AlC powder to be in a viscous state to obtain a mixture; the mass ratio of the absolute ethyl alcohol to the PVB binder is 25 to 1 to 5, and the ratio of the Ti to the PVB binder is as follows 2 The mass ratio of the Al powder to the PVB binder is 200 to 20;
thirdly, placing the mixture obtained in the second step into a pore-forming die for extrusion forming, and obtaining a prefabricated body after demolding; the pressure of the extrusion forming is 0.5MPa to 10MPa, and the pressure maintaining time is 1min to 10min;
step four, drying the prefabricated body obtained in the step three, and then placing the dried prefabricated body into a high-temperature furnace for sintering and forming to obtain an ordered porous prefabricated body; the drying is carried out for 30min at 50 ℃ by adopting a vacuum drying oven; the sintering and forming process comprises the following steps: vacuumizing, heating to 400-600 ℃ at the speed of 2-10 ℃/min, preserving heat for 30min to 60min, heating to 1000-1300 ℃ at the speed of 5-30 ℃/min under the argon protection atmosphere, preserving heat for 30min to 60min, and naturally cooling along with a furnace after the heat preservation is finished;
step five, placing the ordered porous preform obtained in the step four into an alumina crucible, and placing the ordered porous preform into the alumina cruciblePlacing mixed powder of the high-chromium cast iron powder and the alloying ZTA powder on the surface, and then placing the mixed powder into a high-temperature furnace for non-pressure infiltration to obtain the high-chromium cast iron wear-resistant material with the ordered structure; the mass ratio of the high-chromium cast iron powder to the alloying ZTA powder in the mixed powder is (4) - (1 to 90) 2 The mass ratio of the AlC powder is 2 to 1; the non-pressure infiltration process comprises the following steps: under the protection of vacuum or argon, firstly heating to 1300-1600 ℃ at the speed of 5-20 ℃/min, then preserving heat for 5-30min, then cooling to 1100-1300 ℃ and preserving heat for 30min-120min.
The invention firstly prepares Ti 2 Mixing and bonding AlC powder, extruding and forming by a pore-forming die to obtain a prefabricated body, and controlling Ti 2 The mass ratio of AlC powder, absolute ethyl alcohol and PVB binder, the pressure and the pressure maintaining time of extrusion forming are adopted to form prefabricated macropores in the prefabricated body, and then the prefabricated body is dried and sintered to form an ordered porous prefabricated body, so that Ti is prepared 2 The method comprises the following steps that AlC powder is decomposed into a fixed TiC skeleton, namely an MX skeleton, in situ, ordered distribution of a TiC reinforcing phase is realized, absolute ethyl alcohol and a PVB binder are volatilized after decomposition to form a microporous structure, and the porosity (including a prefabricated macroporous structure and a microporous structure) in an ordered porous prefabricated body is controlled to be 20% -90%; then placing mixed powder of high-chromium cast iron powder and alloying ZTA powder on the surface of the ordered porous preform and carrying out pressureless infiltration, converting the high-chromium cast iron powder into liquid at high temperature near the liquidus line of the high-chromium cast iron, infiltrating into pores including prefabricated macropores and micropores of a TiC framework of the ordered porous preform under the action of gravity and capillary force, wherein the alloying ZTA powder with larger particles is difficult to penetrate through the pores of the TiC framework and only stays in a specific area of the prefabricated macropores of the ordered porous preform, realizing the ordered distribution of a ZTA reinforcing phase, and obtaining the high-chromium cast iron wear-resistant material with the MX framework and the ZTA particles being reinforced in ordered distribution.
The preparation method of the ordered structure high-chromium cast iron wear-resistant material is characterized in that the Ti in the step one is used 2 The AlC powder is replaced by other MAX phase powder, and the alloyed ZTA powder is replaced by TiC powder or NbC powder.
The preparation method of the high-chromium cast iron wear-resistant material with the ordered structure is characterized in that the high-chromium cast iron powder in the step one is replaced by high-manganese steel or alloy steel.
The preparation method of the ordered structure high-chromium cast iron wear-resistant material is characterized in that the pressureless infiltration in the step five is replaced by pressure infiltration, and the pressure infiltration process comprises the following steps: in a vacuum atmosphere, heating to 1300-1600 ℃ at a speed of 5-20 ℃/min, then charging Ar gas for pressurization, wherein the pressurization pressure is 5-15MPa, the pressurization time is 5-10min, and the temperature is kept and the pressure is kept for 10-20mim, then cooling to 1100-1300 ℃ and then keeping the temperature for 30min-120min. The invention adopts pressure infiltration, which is beneficial to increasing the compactness of the high-chromium cast iron wear-resistant material with the ordered structure of the product and improving the hardness performance of the product.
Compared with the prior art, the invention has the following advantages:
1. the invention uses Ti 2 Preparing ordered porous prefabricated body with AlC powder as material, setting the mixed powder of high-chromium cast iron powder and alloyed ZTA powder on the surface of ordered porous prefabricated body and making pressureless infiltration to make Ti 2 The AlC powder is decomposed into a fixed TiC skeleton in situ, the high-chromium cast iron powder is melted and infiltrated into pores of the ordered porous prefabricated body to form a matrix, and the alloyed ZTA powder is distributed in a specific area in the prefabricated macropores of the ordered porous prefabricated body, so that the ordered distribution of a TiC reinforcing phase and a ZTA reinforcing phase in the high-chromium cast iron is realized, the high-chromium cast iron wear-resistant material with an ordered structure is obtained, and the problem of uneven distribution of the reinforcing phases is solved.
2. The invention controls Ti 2 The mass ratio of the AlC powder to the absolute ethyl alcohol to the PVB binder, the extrusion forming pressure and the pressure maintaining time are controlled, the porosity in the ordered porous preform is controlled to be 20% -90%, and the content of a TiC reinforcing phase in the ordered structure high-chromium cast iron wear-resistant material is further controlled.
3. Compared with a single uniform structure material, the TiC reinforcing phase is orderly distributed in the high-chromium cast iron matrix to serve as the MX framework, the ZTA reinforcing phase is orderly distributed on one side of the surface of the high-chromium cast iron matrix, the MX framework and the ZTA reinforcing phase play a reinforcing role, and the fracture resistance of the high-chromium cast iron wear-resistant material with the ordered structure is improved.
4. In the pressureless infiltration process, the temperature is reduced and preserved after the temperature is raised and preserved, so that the ZTA enhanced phase changes phase and expands in volume, and the problems of multiple holes, poor compactness and the like of a single MX framework enhanced high-chromium cast iron material are solved.
5. According to the invention, the pore-forming die is adopted to prefabricate macropores in the preform and control the porosity of the ordered porous preform, so that the ordered distribution of TiC reinforcing phases is controlled, the infiltration capacity of the high-chromium cast iron is greatly improved, the pressure-free infiltration temperature of the high-chromium cast iron powder is reduced, the pressure-free infiltration time is shortened, and the preparation energy consumption is obviously reduced.
6. The raw material of MX reinforcing phase adopted by the invention for preparing the high-chromium cast iron wear-resistant material with the ordered structure is not limited to Ti 2 Other MAX phase powder can be adopted as AlC powder, and alloyed ZTA powder can be replaced by TiC powder or NbC powder, so that the application range of the invention is expanded.
7. The preparation method has the advantages of simple preparation process, low cost, strong designability and high practical value, and can design the structure of the ordered porous prefabricated body according to the structure and performance requirements of a target product.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a diagram of an ordered structure high-chromium cast iron wear-resistant material prepared in example 1 of the present invention.
Fig. 2 is a microscopic structure view of the box area in fig. 1.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, selecting Ti 2 AlC powder, absolute ethyl alcohol, PVB binder, high-chromium cast iron powder and alloying ZTA powder are taken as raw materials; the grain size of the alloying ZTA powder is 0.2mm;
step two, mixing and stirring 25g of absolute ethyl alcohol in the raw material in the step one and 1g of PVB binder until the PVB binder is completely dissolved, and then adding 200g of Ti 2 Continuously stirring the AlC powder to a viscous state to obtain a mixture;
thirdly, placing the mixture obtained in the second step into a round honeycomb mould for extrusion forming, and obtaining a prefabricated body after demoulding; the extrusion forming pressure is 0.5MPa, and the pressure maintaining time is 1min;
step four, putting the prefabricated body obtained in the step three into a vacuum drying oven to be dried for 30min at the temperature of 50 ℃, and then putting the prefabricated body into a high-temperature furnace to be sintered and molded to obtain an ordered porous prefabricated body; the sintering and molding process comprises the following steps: vacuumizing, heating to 400 ℃ at the speed of 2 ℃/min, then preserving heat for 30min, heating to 1000 ℃ at the speed of 5 ℃/min under the argon protection atmosphere, preserving heat for 30min, and naturally cooling along with the furnace after heat preservation;
putting the ordered porous preform obtained in the fourth step into an alumina crucible, putting mixed powder of 400g of high-chromium cast iron powder and 100g of alloying ZTA powder in the raw material in the first step on the surface of the ordered porous preform, and then putting the ordered porous preform into a high-temperature furnace for pressureless infiltration to obtain the high-chromium cast iron wear-resistant material with the ordered structure; the pressureless infiltration process comprises the following steps: in vacuum atmosphere, firstly heating to 1300 ℃ at the speed of 5 ℃/min, then preserving heat for 5min, then cooling to 1000 ℃ and preserving heat for 30min.
Fig. 1 is a physical diagram of the high-chromium cast iron wear-resistant material with the ordered structure prepared in the embodiment, fig. 2 is a microscopic structure diagram of a box area in fig. 1, and as shown in fig. 1 and fig. 2, the ordered porous preform in the high-chromium cast iron wear-resistant material with the ordered structure is well combined with a molding interface of mixed powder, and further detection shows that the hardness of the molding interface reaches above 60HRC, which indicates that the material has excellent wear-resistant performance.
Example 2
The embodiment comprises the following steps:
step one, selecting Ti 2 AlC powder, absolute ethyl alcohol, PVB binder, high-chromium cast iron powder and alloying ZTA powder are taken as raw materials; the grain size of the alloying ZTA powder is 2mm;
step two, mixing and stirring 5g of absolute ethyl alcohol in the raw material in the step one and 1g of PVB binder until the PVB binder is completely dissolved, and then adding 20g of Ti 2 Continuously stirring the AlC powder to be in a viscous state to obtain a mixture;
thirdly, placing the mixture obtained in the second step into a square honeycomb mould for extrusion forming, and obtaining a prefabricated body after demoulding; the extrusion molding pressure is 10MPa, and the pressure maintaining time is 10min;
step four, putting the prefabricated body obtained in the step three into a vacuum drying oven to be dried for 30min at the temperature of 50 ℃, and then putting the prefabricated body into a high-temperature furnace to be sintered and molded to obtain an ordered porous prefabricated body; the sintering and molding process comprises the following steps: vacuumizing, heating to 600 ℃ at the speed of 10 ℃/min, then preserving heat for 60min, heating to 1300 ℃ at the speed of 30 ℃/min under the argon protection atmosphere, preserving heat for 60min, and naturally cooling along with the furnace after heat preservation is finished;
putting the ordered porous preform obtained in the fourth step into an alumina crucible, putting mixed powder of 180g of high-chromium cast iron powder and 2g of alloying ZTA powder in the raw material in the first step on the surface of the ordered porous preform, and then putting the ordered porous preform into a high-temperature furnace for non-pressure infiltration to obtain the high-chromium cast iron wear-resistant material with the ordered structure; the pressureless infiltration process comprises the following steps: under the vacuum atmosphere, firstly heating to 1600 ℃ at the speed of 20 ℃/min, then preserving heat for 30min, then cooling to 1300 ℃ and preserving heat for 120min.
Example 3
The embodiment comprises the following steps:
step one, selecting Ti 2 AlC powder, absolute ethyl alcohol, PVB binder, high-chromium cast iron powder and alloying ZTA powder are taken as raw materials; the grain diameter of the alloying ZTA powder is 1.1mm;
step two, mixing and stirring 15g of absolute ethyl alcohol in the raw material in the step one and 1g of PVB binder until the PVB binder is completely dissolved, and then adding 110g of Ti 2 Continuously stirring the AlC powder to be in a viscous state to obtain a mixture;
thirdly, placing the mixture obtained in the second step into a honeycomb mould for extrusion forming, and obtaining a prefabricated body after demoulding; the extrusion forming pressure is 5MPa, and the pressure maintaining time is 6min;
step four, putting the prefabricated body obtained in the step three into a vacuum drying oven, drying for 30min at 50 ℃, and then putting into a high-temperature furnace for sintering and forming to obtain an ordered porous prefabricated body; the sintering and molding process comprises the following steps: vacuumizing, heating to 500 ℃ at the speed of 6 ℃/min, then preserving heat for 40min, heating to 1150 ℃ at the speed of 18 ℃/min under the argon protection atmosphere, preserving heat for 45min, and naturally cooling along with the furnace after heat preservation is finished;
putting the ordered porous preform obtained in the fourth step into an alumina crucible, putting the mixed powder of 660g of high-chromium cast iron powder and 13g of alloying ZTA powder in the raw material in the first step on the surface of the ordered porous preform, and then putting the ordered porous preform into a high-temperature furnace for non-pressure infiltration to obtain the high-chromium cast iron wear-resistant material with the ordered structure; the pressureless infiltration process comprises the following steps: under the vacuum atmosphere, the temperature is increased to 1450 ℃ at the speed of 13 ℃/min, then the temperature is preserved for 18min, then the temperature is reduced to 1150 ℃ and then the temperature is preserved for 75min.
Example 4
The present embodiment differs from embodiment 1 in that: in the fifth step, pressure infiltration is adopted to replace non-pressure infiltration, and the process of pressure infiltration is as follows: in a vacuum atmosphere, heating to 1300 ℃ at the speed of 5 ℃/min, then filling Ar gas for pressurization, wherein the pressurization pressure is 15MPa, the pressurization time is 10min, and the temperature is maintained for 10min to 20 mm, then the temperature is reduced to 1100 ℃ and the temperature is maintained for 120min.
Example 5
The present embodiment differs from embodiment 1 in that: in the fifth step, pressure infiltration is adopted to replace non-pressure infiltration, and the process of pressure infiltration is as follows: under the vacuum atmosphere, firstly heating to 1600 ℃ at the speed of 20 ℃/min, then filling Ar gas for pressurization, wherein the pressurization pressure is 5MPa, the pressurization time is 5min, and the temperature is kept and the pressure is kept for 5mim, then the temperature is reduced to 1300 ℃ and the temperature is kept for 30min.
Example 6
The present embodiment differs from embodiment 1 in that: in the fifth step, pressure infiltration is adopted to replace non-pressure infiltration, and the process of pressure infiltration is as follows: under the vacuum atmosphere, the temperature is firstly increased to 1450 ℃ at the speed of 12.5 ℃/min, then Ar gas is filled for pressurization, the pressurization pressure is 10MPa, the pressurization time is 7.5min, the temperature and the pressure are kept for 15 mm, then the temperature is reduced to 1200 ℃, and the temperature is kept for 75min.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (4)
1. The preparation method of the high-chromium cast iron wear-resistant material with the ordered structure is characterized by comprising the following steps of:
step one, selecting Ti 2 AlC powder, absolute ethyl alcohol, PVB binder, high-chromium cast iron powder and alloying ZTA powder are taken as raw materials; the grain size of the alloying ZTA powder is 0.2mm-2mm;
step two, mixing and stirring the absolute ethyl alcohol in the raw materials in the step one with the PVB binder until the PVB binder is completely dissolved, and then adding Ti 2 Continuously stirring the AlC powder to be in a viscous state to obtain a mixture; the mass ratio of the absolute ethyl alcohol to the PVB binder is 25 to 1-5 2 The mass ratio of the Al powder to the PVB binder is 200 to 20;
thirdly, placing the mixture obtained in the second step into a pore-forming die for extrusion forming, and obtaining a prefabricated body after demolding; the pressure of the extrusion forming is 0.5MPa to 10MPa, and the pressure maintaining time is 1min to 10min;
step four, drying the prefabricated body obtained in the step three, and then placing the dried prefabricated body into a high-temperature furnace for sintering and forming to obtain an ordered porous prefabricated body; the drying is carried out for 30min at 50 ℃ by adopting a vacuum drying oven; the sintering and molding process comprises the following steps: vacuumizing, heating to 400-600 ℃ at the speed of 2-10 ℃/min, preserving heat for 30min to 60min, heating to 1000-1300 ℃ at the speed of 5-30 ℃/min under the argon protection atmosphere, preserving heat for 30min to 60min, and naturally cooling along with a furnace after the heat preservation is finished;
putting the ordered porous preform obtained in the fourth step into an alumina crucible, putting mixed powder of the high-chromium cast iron powder and the alloying ZTA powder which are used as raw materials in the first step on the surface of the ordered porous preform, and then putting the ordered porous preform into a high-temperature furnace for pressureless infiltration to obtain the high-chromium cast iron wear-resistant material with the ordered structure; the mass ratio of the high-chromium cast iron powder to the alloying ZTA powder in the mixed powder is (4) - (1 to 90) 2 The mass ratio of the AlC powder is 2 to 1; the pressureless infiltration process comprises the following steps: in vacuum or argon atmosphereUnder the atmosphere protection, firstly heating to 1300-1600 ℃ at the speed of 5-20 ℃/min, then preserving heat for 5-30min, then cooling to 1100-1300 ℃ and preserving heat for 30min-120min.
2. The method for preparing the ordered structure high-chromium cast iron wear-resistant material according to claim 1, wherein the Ti in the first step 2 The AlC powder is replaced by other MAX phase powder, and the alloyed ZTA powder is replaced by TiC powder or NbC powder.
3. The method for preparing the high-chromium cast iron wear-resistant material with the ordered structure according to claim 1, wherein the high-chromium cast iron powder is replaced by high-manganese steel or alloy steel in the step one.
4. The method for preparing the ordered structure high-chromium cast iron wear-resistant material according to claim 1, wherein the pressureless infiltration in the step five is replaced by pressure infiltration, and the pressure infiltration process comprises the following steps: in a vacuum atmosphere, heating to 1300-1600 ℃ at a speed of 5-20 ℃/min, then filling Ar gas for pressurization, wherein the pressurization pressure is 5-15MPa, the pressurization time is 5-10min, and the temperature and pressure are kept for 10min-20mim, then cooling to 1100-1300 ℃ and then keeping the temperature for 30min-120min.
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