CN110157998B - Superhard self-lubricating cutter material and preparation method thereof - Google Patents
Superhard self-lubricating cutter material and preparation method thereof Download PDFInfo
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- CN110157998B CN110157998B CN201910444668.8A CN201910444668A CN110157998B CN 110157998 B CN110157998 B CN 110157998B CN 201910444668 A CN201910444668 A CN 201910444668A CN 110157998 B CN110157998 B CN 110157998B
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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
- B22F3/02—Compacting only
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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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/14—Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy, i.e. by processing mixtures of metal powder and fibres or filaments
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
Abstract
The invention provides a superhard self-lubricating cutter material and a preparation method thereof, belonging to the technical field of ceramic material preparation, aiming at the advantages of high hardness of titanium diboride particles, toughening and reinforcing property of silicon carbide fiber and good lubricating property of graphite, aluminum powder, cobalt powder, chromium powder, iron powder and nickel powder are used as binders, the titanium diboride particles, the silicon carbide fiber, the graphite, the aluminum powder, the cobalt powder, the chromium powder, the iron powder and the nickel powder are uniformly mixed and alloyed by a high-energy ball milling technology to form eight-element mixed powder, the eight-element mixed powder is sintered and formed by a high-energy pulse current sintering technology, the high-energy pulse current sintering technology has the characteristics of high sintering speed, low sintering temperature and the like, the preparation method has advanced process, accurate and real data, the prepared superhard self-lubricating composite material has uniform tissue distribution and good combination between interfaces, the density can reach more than 98 percent, and the Vickers hardness can reach 300HV, so the method is an ideal method for preparing the superhard self-lubricating composite material.
Description
Technical Field
The invention belongs to the technical field of ceramic material preparation, and particularly discloses a superhard self-lubricating cutter material and a preparation method thereof.
Background
The titanium diboride ceramic material has the advantages of low density and high hardness, and is a good wear-resistant material. However, titanium diboride belongs to brittle materials, and has poor toughness and impact resistance, and titanium diboride particles are usually sintered into bulk materials by a high-energy pulse current sintering method by adding a binder in the titanium diboride materials.
The silicon carbide fiber is a good toughening and reinforcing fiber of the high-temperature ceramic matrix composite material, has the advantages of high-temperature oxidation resistance, corrosion resistance, low density and the like, and can effectively enhance the toughness of the composite material.
The graphite is a good wear-resistant lubricating material, has good chemical stability and high temperature resistance, and can work well at the temperature of 200-2000 ℃ without using lubricating oil.
The characteristics of the materials provide a foundation for the preparation of superhard self-lubricating cutter materials, but no related technology is available for preparing superhard self-lubricating cutter materials by using the materials as raw materials.
Disclosure of Invention
Aiming at the characteristic of high hardness of titanium diboride, titanium diboride particles are selected as a wear-resistant material, silicon carbide fibers are selected as a toughening material, graphite is selected as a lubricating material, aluminum powder, cobalt powder, chromium powder, iron powder and nickel powder are selected as binders, the titanium diboride particles, the silicon carbide fibers, the graphite, the aluminum powder, the cobalt powder, the chromium powder, the iron powder and the nickel powder are uniformly mixed by a high-energy ball milling technology, so that the surfaces of the titanium diboride particles, the silicon carbide fibers and the graphite are alloyed, and the superhard self-lubricating composite material is prepared by a high-energy pulse current sintering technology, so that the demand of the industrial field on the cutter material for turning is met.
In order to achieve the aim, the invention provides a preparation method of a superhard self-lubricating cutter material, which comprises the following steps:
step one, preoxidizing titanium diboride powder
Placing titanium diboride powder in a quartz container, then placing the quartz container in a resistance wire heating furnace, and carrying out pre-oxidation treatment, wherein the pre-oxidation temperature is 1000 ℃, and the oxidation time is 60 min;
step two, batching
Weighing 68: 16: 1: 1.6: 3.5: 3.1: 3.3: 3.5 placing the titanium diboride powder, the silicon carbide fiber, the graphite powder, the aluminum powder, the cobalt powder, the chromium powder, the iron powder and the nickel powder in a ball milling tank, and sealing;
step three, ball milling
Placing the ball milling tank on a ball mill for ball milling, wherein the ball milling rotation speed is 1500r/min, and the ball milling time is 120min;
step four, charging
Taking the eight-element mixed powder which is subjected to ball milling and is uniformly mixed out of the ball milling tank, and putting the eight-element mixed powder into a graphite mold;
step five, pre-compacting
Placing the graphite mould filled with the eight-element mixed powder on a workbench of a press machine for pre-compaction, wherein the pre-compaction pressure is 10MPa, and the pressure maintaining time is 5 min;
step six, sintering the composite material by high-energy pulse current
The sintering of the superhard self-lubricating composite material is finished in a high-energy pulse current sintering furnace in the processes of high-energy pulse current heating, external water circulation cooling and pressure application in a vacuum environment;
opening a furnace body, and vertically placing a graphite mold on the upper part of a lower electrode in a furnace chamber of a sintering furnace;
moving a lower electrode in the sintering furnace downwards, keeping the centers of the lower electrode, the graphite mold and the upper electrode on a central line, centering and pressing, wherein the pressing pressure is 2MPa, and graphite cushion blocks are respectively padded between the lower electrode and the graphite mold and between the upper electrode and the graphite mold;
thirdly, closing the furnace body and sealing;
starting a vacuum pump, and pumping air in the machine to enable the pressure in the machine to reach 1 Pa;
starting a high-energy pulse current heater, and heating to 300 +/-2 ℃;
starting a pressure motor, applying pressure to the eight-element mixed powder in the graphite die through the upper electrode and the graphite cushion block, wherein the pressure intensity is 40MPa, and the pressure is kept constant;
seventhly, increasing the pulse current, continuously heating the eight-element mixed powder to 1200 +/-2 ℃, preserving heat and maintaining pressure for 5 min;
ninthly, stopping heating and pressing after heating and pressing, and cooling the eight-element mixed powder to 100 ℃ along with the furnace body;
opening a furnace door of the furnace body at the red spot, taking out the graphite mold and the sintered composite material in the graphite mold, and naturally cooling the graphite mold and the sintered composite material in the graphite mold to 25 ℃ in the air;
step seven, opening the mold
After cooling, opening the graphite mold, and taking out the superhard self-lubricating composite material sintered by the high-energy pulse current.
Further, the graphite mold is an open-close type mold, and the surface roughness of a mold cavity is Ra 0.08-0.16 mu m.
Further, in the sixth step, the high-energy pulse current sintering furnace is vertical and comprises a furnace body, a water tank, a pressure motor, a vacuum pump and an electric control cabinet; the interior of the furnace body is a sintering furnace chamber, and the exterior is surrounded by an external water circulation cooling pipe; the external water circulation cooling pipe is communicated with the water inlet pipe and the water outlet pipe; the water inlet pipe is communicated with the water tank through a water pump, and the water outlet pipe is communicated with the water tank; a lower electrode is arranged at the lower part of the sintering furnace chamber, a lower graphite cushion block is padded at the upper part of the lower electrode, a graphite mould is placed at the upper part of the lower graphite cushion block, a thermocouple is installed at the upper part of the graphite mould, a lower cushion head is arranged at the middle lower part of the graphite mould, eight-element mixed powder is placed at the upper part of the lower cushion head, an upper pressure head is arranged at the upper part of the eight-element mixed powder, and an upper graphite cushion block is arranged between the upper pressure head and the; the pressure motor is connected with the upper electrode; the vacuum pump is provided with a first vacuum tube for exhausting and is communicated with the sintering furnace chamber through a second vacuum tube; the electric control cabinet is provided with a power switch, a current regulator, a vacuum pump controller, a pressure controller, an external water circulation controller, an indicator light and a display screen; the water tank, the vacuum pump, the furnace body, the pressure motor and the electric control cabinet are connected through a first connecting wire, a second connecting wire, a third connecting wire and a fourth connecting wire.
Further, furnace body, water tank, pressure motor, vacuum pump and automatically controlled cabinet all set up on the workstation.
Step eight, polishing and sanding
The superhard self-lubricating composite material sintered by high-energy pulse current is placed on a steel flat plate, and the periphery and the surface are polished by abrasive paper.
The invention also provides a superhard self-lubricating cutter material, which is characterized by being prepared by the preparation method of the superhard self-lubricating composite material.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a superhard self-lubricating cutter material and a preparation method thereof, aiming at the advantages of high hardness of titanium diboride particles and good toughness and reinforcement of silicon carbide fiber and good lubricating property of graphite, aluminum powder, cobalt powder, chromium powder, iron powder and nickel powder are used as binders, the titanium diboride particles, the silicon carbide fiber, the graphite, the aluminum powder, the cobalt powder, the chromium powder, the iron powder and the nickel powder are uniformly mixed and alloyed by a high-energy ball milling technology to form eight-element mixed powder, the eight-element mixed powder is sintered and formed by a high-energy pulse current sintering technology, the high-energy pulse current sintering technology has the characteristics of high sintering speed, low sintering temperature and the like, the preparation method has advanced process and accurate and real data, the prepared superhard self-lubricating composite material has uniform tissue distribution and good combination among interfaces, and the density can reach more than 98 percent by the measurement of an Archimedes drainage method, the Vickers hardness can reach 300HV, and the method can be used as a cutter material and is an ideal method for preparing the superhard self-lubricating composite material.
Drawings
Fig. 1 is a microstructure and topography of a superhard self-lubricating composite material provided by an embodiment of the invention;
FIG. 2 is an interface topography of a superhard self-lubricating composite material provided by an embodiment of the present invention;
fig. 3 is an interface line scanning map of the superhard self-lubricating composite material provided by the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a high-energy pulse current sintering furnace in an embodiment of the invention.
In the figure: 1. a high-energy pulse current sintering furnace, 2, a die upper pressure head, 3, a sintering furnace cavity, 4, an outer water circulation cooling pipe, 5, a graphite die, 6, eight-element mixed powder, 7, a die lower cushion head, 8, a lower graphite cushion block, 9, a lower electrode, 10, a workbench, 11, a water return pipe, 12, a left bracket, 13, a water tank, 14, a first connecting wire, 15, a vacuum pump, 16, a first vacuum pipe, 17, a second vacuum pipe, 18, the device comprises a second connecting wire, a second bracket, a third connecting wire, a fourth connecting wire, a third connecting wire, an electric control cabinet, a fourth connecting wire, a third connecting wire, a fourth connecting wire, a third.
Detailed Description
The chemical materials used in this example were: titanium diboride powder, silicon carbide fiber, graphite powder, aluminum powder, cobalt powder, chromium powder, iron powder, nickel powder and absolute ethyl alcohol, wherein the combined preparation amount is as follows: measured in grams and millimeters
Titanium diboride powder: TiB2 68 g±0.01g
Silicon carbide fiber: SiCf 16g±0.01g
Graphite powder: c1 g. + -. 0.01g
Aluminum powder: al 1.6 g. + -. 0.01g
Cobalt powder: co 3.5 g. + -. 0.01g
Chromium powder: cr 3.1 g. + -. 0.01g
Iron powder: fe 3.3. + -. 0.01g
Nickel powder: ni 3.5. + -. 0.01g
Graphite paper: c2 block 90mm x 2mm x 90mm
Sand paper: 400 mesh 2 pieces 300mm x 0.5mm x 200mm
Anhydrous ethanol: c2H5OH 200mL±5 mL
The preparation method comprises the following steps:
(1) preparation of open-close type mould
The opening-closing type die is made of graphite materials, and the surface roughness of a die cavity of the die is Ra 0.08-0.16 mu m;
(2) preoxidized TiB2Powder
Mixing TiB2Placing the powder in a quartz container, placing in a resistance wire heating furnace, and pre-oxidizingThe melting temperature is 1000 ℃, and the oxidation time is 60 min; the purpose of pre-oxidation is to obtain the surface roughness of TiB2A layer of boron oxide film is formed on the surface of the powder particles, so that the interface bonding performance between the titanium diboride particles and the binder is improved;
(3) ingredients
Weighing 68g +/-0.01 g of titanium diboride powder, 16g +/-0.01 g of silicon carbide fiber, 1g +/-0.01 g of graphite powder, 1.6g +/-0.01 g of aluminum powder, 3.5g +/-0.01 g of cobalt powder, 3.1g +/-0.01 g of chromium powder, 3.3g +/-0.01 g of iron powder and 3.5g +/-0.01 g of nickel powder, placing the materials in a ball milling tank, and sealing the ball milling tank;
titanium diboride powder: silicon carbide fiber: graphite powder: aluminum powder: cobalt powder: chromium powder: iron powder: nickel powder =
68：16：1：1.6：3.5：3.1：3.3：3.5；
(4) Ball mill
Placing the ball milling tank on a ball mill for ball milling, wherein the ball milling rotation speed is 1500r/min, and the ball milling time is 120min;
(5) charging
Taking the eight-element mixed powder 6 which is subjected to ball milling and is uniformly mixed out of the ball milling tank; opening the graphite mold 5, taking out the upper pressure head of the mold, placing graphite paper on the upper part of the lower cushion head of the mold, placing eight-element mixed powder 6 on the upper part of the graphite paper, placing graphite paper on the upper part of the eight-element mixed powder 6, and placing the upper pressure head on the upper part of the graphite paper;
(6) precompaction
Placing the graphite mould 5 filled with the eight-element mixed powder 6 on a workbench of a manual press for pre-compaction, wherein the pre-compaction pressure is 10MPa, and the pressure maintaining time is 5 min;
(7) high-energy pulse current sintering composite material
The sintering of the superhard self-lubricating composite material is finished in a high-energy pulse current sintering furnace in the processes of high-energy pulse current heating, external water circulation cooling and pressure application in a vacuum environment;
opening a furnace opening body 1, and vertically placing an opening-closing type graphite mold 5 on the upper part of a lower electrode 9 in a sintering furnace chamber 3;
moving an upper electrode 9 in the sintering furnace chamber 3 downwards, keeping the centers of the lower electrode 9, the graphite mold 5 and the upper electrode 31 on a central line, centering and pressing, wherein the pressing pressure is 2MPa, and graphite cushion blocks are respectively padded between the lower electrode 9 and the graphite mold 5 and between the upper electrode 31 and the graphite mold 5;
thirdly, closing the furnace body 1 and sealing;
starting a vacuum pump 15, and pumping air in the machine to enable the pressure in the machine to reach 1 Pa;
starting a high-energy pulse current heater, and heating to 300 +/-2 ℃;
starting a pressure motor 30, applying pressure to the eight-element mixed powder 6 in the graphite mold 5 through the graphite cushion block by an upper electrode 31, wherein the pressure intensity is 40MPa, and the pressure is kept constant;
increasing the pulse current, continuously heating the eight-element mixed powder 6 to 1200 +/-2 ℃, preserving the temperature and maintaining the pressure for 5 min;
ninthly, stopping heating and pressing after heating and pressing, and cooling the eight-element mixed powder 6 to 100 ℃ along with the high-energy pulse current sintering furnace;
opening a furnace door of the furnace body 1 at the red spot, taking out the graphite mold 5 and the sintered composite material in the graphite mold, and naturally cooling the graphite mold to 25 ℃ in the air;
(8) opening mould
After cooling, opening the graphite mold 5, and taking out the superhard self-lubricating composite material sintered by the high-energy pulse current;
(9) polishing and sanding treatment
Placing the superhard self-lubricating composite material sintered by high-energy pulse current on a steel flat plate, and polishing the periphery and the surface by using abrasive paper to clean the superhard self-lubricating composite material;
(10) detection, analysis, characterization
Detecting, analyzing and representing the appearance, color, microstructure appearance and mechanical property of the prepared superhard self-lubricating composite material;
carrying out microstructure morphology analysis by using a scanning electron microscope;
fig. 1 is a microstructure topography (magnification 1000) of a superhard self-lubricating composite material, showing: all the components are distributed uniformly, and the local agglomeration phenomenon is not generated;
fig. 2 is an interface topography (magnification 2000) of the superhard self-lubricating composite material, shown in the figure: the interface bonding between different components is good, and the metallurgical bonding is achieved;
map scan with X-ray energy spectrometer (EDS), fig. 3 is an interface line scan map of the superhard self-lubricating composite material, as shown: at the interfaces of different components, an element diffusion layer with a certain thickness exists, the element diffusion is smooth, and the mutation of the element does not occur;
the hardness test is carried out by a Vickers hardness tester, and the Vickers hardness can reach 300 HV;
and (4) conclusion: the superhard self-lubricating composite material is gray black, all components are uniformly distributed, the interface bonding among the titanium diboride particles, the silicon carbide fibers, the graphite particles and the binder is good, no defects such as air holes, cracks and the like are generated in the composite material, and the Vickers hardness of the composite material can reach 300 HV;
(11) storage of
The prepared superhard self-lubricating composite material is packaged by a soft material and stored in a clean and dry environment, and the storage temperature is 20 ℃ and the relative humidity is less than or equal to 10 percent, wherein the environment is protected from moisture, sun and acid, alkali and salt corrosion.
As shown in fig. 4, the high-energy pulse current sintering furnace is vertical and comprises a furnace body 1, a water tank 13, a pressure motor 30, a vacuum pump 15 and an electric control cabinet 21; the interior of the furnace body 1 is a sintering furnace chamber 3, and the exterior is surrounded by an external water circulation cooling pipe 4; the external water circulation cooling pipe 4 is communicated with the water inlet pipe 33 and the water outlet pipe 11; the water inlet pipe 33 is communicated with the water tank 13 through a water pump 34, and the water outlet pipe 11 is communicated with the water tank 13; a lower electrode 9 is arranged at the lower part of the sintering furnace chamber 3, a lower graphite cushion block 8 is padded at the upper part of the lower electrode 9, a graphite mold 5 is placed at the upper part of the lower graphite cushion block 8, a thermocouple 35 is installed at the upper part of the graphite mold 5, a lower cushion head 7 is arranged at the middle lower part of the graphite mold 5, eight-element mixed powder 6 is placed at the upper part of the lower cushion head 7, an upper pressure head 2 is arranged at the upper part of the eight-element mixed powder 6, and an upper graphite cushion block 32 is arranged between the upper pressure head 2 and the upper; the pressure motor 30 is connected with the upper electrode 31; the vacuum pump 15 is provided with a first vacuum tube 16 for exhausting gas and is communicated with the sintering furnace chamber 3 through a second vacuum tube 17; the electric control cabinet 21 is provided with a power switch 22, a current regulator 23, a vacuum pump controller 24, a pressure controller 25, an external water circulation controller 26, an indicator lamp 27 and a display screen 28; the water tank 13, the vacuum pump 15, the furnace body 1, the pressure motor 30 and the electric control cabinet 21 are connected through a first connecting wire 14, a second connecting wire 18, a third connecting wire 20 and a fourth connecting wire 29; the furnace body 1, the water tank 13, the pressure motor 30, the vacuum pump 15 and the electric control cabinet 21 are all arranged on the workbench 10.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, or direct or indirect applications in other related fields, which are made by the contents of the present specification, are included in the scope of the present invention.
Claims (6)
1. A preparation method of a superhard self-lubricating cutter material is characterized by comprising the following steps:
step one, preoxidizing titanium diboride powder
Placing titanium diboride powder in a quartz container, then placing the quartz container in a resistance wire heating furnace, and carrying out pre-oxidation treatment, wherein the pre-oxidation temperature is 1000 ℃, and the oxidation time is 60 min;
step two, batching
Weighing 68: 16: 1: 1.6: 3.5: 3.1: 3.3: 3.5 placing the titanium diboride powder, the silicon carbide fiber, the graphite powder, the aluminum powder, the cobalt powder, the chromium powder, the iron powder and the nickel powder in a ball milling tank, and sealing;
step three, ball milling
Placing the ball milling tank on a ball mill for ball milling, wherein the ball milling rotation speed is 1500r/min, and the ball milling time is 120min;
step four, charging
Taking the eight-element mixed powder (6) which is subjected to ball milling and is uniformly mixed out of the ball milling tank, and putting the eight-element mixed powder into a graphite die (5);
step five, pre-compacting
Placing the graphite mould (5) filled with the eight-element mixed powder (6) on a workbench of a press machine for pre-compaction, wherein the pre-compaction pressure is 10MPa, and the pressure maintaining time is 5 min;
step six, sintering the composite material by high-energy pulse current
The sintering of the superhard self-lubricating composite material is finished in a high-energy pulse current sintering furnace in the processes of high-energy pulse current heating, external water circulation cooling and pressure application in a vacuum environment;
opening a furnace body (1), and vertically placing a graphite mold on the upper part of a lower electrode (9) in a sintering furnace chamber (3);
moving a lower electrode (9) in the sintering furnace chamber (3) downwards, keeping the centers of the lower electrode (9), the graphite mold (5) and the upper electrode (31) on a central line, centering and pressing, wherein the pressing pressure is 2MPa, and graphite cushion blocks are respectively padded between the lower electrode (9) and the graphite mold (5) and between the upper electrode (31) and the graphite mold (5);
thirdly, closing the furnace body (1) and sealing;
starting a vacuum pump (15) to pump air in the machine to enable the pressure in the machine to reach 1 Pa;
starting a high-energy pulse current heater, and heating to 300 +/-2 ℃;
starting a pressure motor (30), and applying pressure to the eight-element mixed powder in the graphite mold (5) through a graphite cushion block by an upper electrode (31), wherein the pressure intensity is 40MPa, and the pressure is kept constant;
increasing the pulse current, continuously heating the eight-element mixed powder (6) to 1200 +/-2 ℃, preserving heat and maintaining pressure for 5 min;
ninthly, stopping heating and pressurizing after heating and pressurizing, and cooling the eight-element mixed powder (6) to 100 ℃ along with the furnace body (1);
opening a furnace door of the furnace body (1) at the red spot, taking out the graphite mold (5) and the sintered composite material in the graphite mold (5), and naturally cooling to 25 ℃ in the air;
step seven, opening the mold
After cooling, the graphite mould (5) is opened, and the superhard self-lubricating composite material sintered by the high-energy pulse current is taken out.
2. The method for preparing the superhard self-lubricating cutter material according to claim 1, wherein the graphite mold is an open-close type mold, and the surface roughness of a mold cavity is Ra 0.08-0.16 mu m.
3. The method for preparing superhard self-lubricating cutter material according to claim 1, wherein in the sixth step, the high-energy pulse current sintering furnace is vertical and comprises a furnace body (1), a water tank (13), a pressure motor (30), a vacuum pump (15) and an electric control cabinet (21);
the sintering furnace chamber (3) is arranged in the furnace body (1), and the outer part of the furnace body is surrounded by an outer water circulation cooling pipe (4);
the external water circulation cooling pipe (4) is communicated with the water inlet pipe (33) and the water outlet pipe (11);
the water inlet pipe (33) is communicated with the water tank (13) through a water pump (34), and the water outlet pipe (11) is communicated with the water tank (13);
a lower electrode (9) is arranged at the lower part of the sintering furnace chamber (3), a lower graphite cushion block (8) is padded at the upper part of the lower electrode (9), a graphite die (5) is placed at the upper part of the lower graphite cushion block (8), a thermocouple (35) is installed at the upper part of the graphite die (5), a lower cushion head (7) is arranged at the middle lower part of the graphite die (5), eight-element mixed powder (6) is placed at the upper part of the lower cushion head (7), an upper pressure head (2) is arranged at the upper part of the eight-element mixed powder (6), and an upper graphite cushion block (32) is arranged between the upper pressure head (2) and the upper electrode (;
the pressure motor (30) is connected with an upper electrode (31);
the vacuum pump (15) is provided with a first vacuum tube (16) for exhausting air and is communicated with the sintering furnace chamber (3) through a second vacuum tube (17);
the electric control cabinet (21) is provided with a power switch (22), a current regulator (23), a vacuum pump controller (24), a pressure controller (25), an external water circulation controller (26), an indicator lamp (27) and a display screen (28);
the water tank (13), the vacuum pump (15), the furnace body (1), the pressure motor (30) and the electric control cabinet (21) are connected through a first connecting wire (14), a second connecting wire (18), a third connecting wire (20) and a fourth connecting wire (29).
4. The method for preparing the superhard self-lubricating cutter material according to claim 3, wherein the furnace body (1), the water tank (13), the pressure motor (30), the vacuum pump (15) and the electric control cabinet (21) are all arranged on the workbench (10).
5. The method for preparing superhard self-lubricating cutter material according to claim 1, further comprising the step eight of grinding and sanding
The superhard self-lubricating composite material sintered by high-energy pulse current is placed on a steel flat plate, and the periphery and the surface are polished by abrasive paper.
6. A superhard self-lubricating cutter material prepared by the method of manufacturing a superhard self-lubricating cutter material according to any one of claims 1 to 5.
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| CN113134608A (en) * | 2021-03-30 | 2021-07-20 | 北京航空航天大学 | Device and method for preparing nickel-based high-temperature alloy blank by pulse current auxiliary sintering |
| CN115652125A (en) * | 2022-11-10 | 2023-01-31 | 太原工具厂有限责任公司 | Preparation method of particle-reinforced high-entropy alloy composite material for cutter |
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| JPS5918349B2 (en) * | 1982-07-12 | 1984-04-26 | 工業技術院長 | Titanium carbonitride-metal boride ceramic materials |
| US5427987A (en) * | 1993-05-10 | 1995-06-27 | Kennametal Inc. | Group IVB boride based cutting tools for machining group IVB based materials |
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