CN107142406A - Surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient is formed in situ - Google Patents
Surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient is formed in situ Download PDFInfo
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- CN107142406A CN107142406A CN201710300031.2A CN201710300031A CN107142406A CN 107142406 A CN107142406 A CN 107142406A CN 201710300031 A CN201710300031 A CN 201710300031A CN 107142406 A CN107142406 A CN 107142406A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/04—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbonitrides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
- C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/64—Carburising
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Abstract
The invention discloses surface self-lubricating Ti (C, N) based ceramic metal preparation method that a kind of carbon gradient is formed in situ, it is characterized in that being first incubated 1~2h at 500~700 DEG C, the cermet base substrate of carbide-containing formation element is formed；Then by SiO2Coat TiH2Core/shell structure powder, external diameter, which is less than 8nm, length and is less than 30 μm and specific surface area, is more than 350m2/ g multi-walled carbon nanotube, BaCO3Three kinds of substances in percentage by weight 3:2:1 mixed preparing goes out hydrogeneous carburizing medium；Green compact are embedded in the hydrogeneous carburizing medium and consolidation under 5 ~ 15MPa pressure again；Liquid-phase sintering is finally carried out, surface self-lubricating Ti (C, N) based ceramic metal is prepared.Instant invention overcomes existing process exist crystal grain grow up seriously, carburizing time length, efficiency is low the problem of, be formed in situ in sintering process based on carbon gradient and prepare surface self-lubricating Ti (C, N) based ceramic metal.
Description
Technical field
The present invention relates to a kind of preparation method of cermet, the surface self-lubricating Ti that more particularly to carbon gradient is formed in situ
(C, N) based ceramic metal preparation method, belongs to field of compound material.
Background technology
Ti (C, N) based ceramic metal is the new tool die material grown up on the basis of TiC based ceramic metals, feature
It is that it is a kind of cutter Materials for High Speed Cutting better than common WC base cemented carbides as its main hard phase with Ti (C, N),
The turning of steel and the Milling Process of steel and cast iron are cannot be only used for, and available for wear resistant corrosion resistant environment, prospect of the application
It is very wide.As a kind of tool die material, its anti-wear performance is very crucial, in metal ceramic surface formation high-carbon gradient layer,
Its coefficient of friction is advantageously reduced, self-lubricating function is played, Carburization Treatment is most common method.
CN200910032962.4 disclose a kind of enhanced Ti of gradient structure carbon nano-tube (C, N) based ceramic metals and its
Preparation method.The cermet composition mass fraction is：C is 6.5~8.0, and wherein 0.5-1.0 carbon is introduced by CNT, N
It is that 36~45, Ni is that 20~32, Mo is that 10~18, W is 6~10 for 1.5~2.5, Ti.Raw material is configured to meet by the invention
The compound of composition is stated, then sintered body is obtained through batch mixing, addition forming agent, compressing, degreasing, vacuum-sintering.Again should
Sintered body is placed in double-deck glow plasma carburising stove and carries out Carburization Treatment.Source electrode material is the high purity graphite that purity is higher than 96%,
Purity of argon >=99.0% used, it is 20-40Pa to be filled with argon pressure in stove, and treatment temperature is 1100-1200 DEG C, during processing
Between be 90-180min.CN94119863.4 discloses a kind of method for carburizing of ceramic material.By ceramics (Al2O3、ZrO2Or oxidation
Thing series) immersion HF solution, to carry out being deep into 0.01 μm~100 μm of surface treatment to it；Will be by above-mentioned surface
The ceramic material of reason is put into quartz ampoule, then is transferred in carburizer；It is then injected into siloxanes and ligroin, heating and cooling；Most
Resin treatment, washing are carried out afterwards and is dried, and obtain the carburizing sliding material that carbon-impregnated penetrates into 0.01 μm~100 μm.So, carburizing exists
Carried out under plain mode, sliding material such as Al can be made2O3Deng with improved coefficient of friction and other improved performances.
But, the above method is to carry out Carburization Treatment again after the completion of material sintering, and carburizing time is long, inefficient；And
And easily there is crystal grain and grown up in cermet material under high temperature, causes material property to decline.Therefore, searching prepares surface self-lubricating
The new method of cermet material is very necessary.
The content of the invention
When the present invention for preparing surface self-lubricating cermet material at present, the crystal grain that " sintering+carburizing " technique is present
Grow up serious, carburizing time length, the problem of efficiency is low, propose first to prepare the cermet base of carbide-containing formation element
Body, then by SiO2Coat TiH2Core/shell structure powder, multi-walled carbon nanotube, BaCO3Uniformly shape is mixed during mixing planetary ball mill
Into hydrogeneous carburizing medium, then porous green compact are put into carburizing medium and consolidation is carried out, finally carry out preparation during liquid-phase sintering
Go out surface self-lubricating Ti (C, N) based ceramic metal.
Surface self-lubricating Ti (C, N) based ceramic metal preparation method that the carbon gradient of the present invention is formed in situ, its feature exists
In comprising the steps of successively：
（1）The cermet body preparation of carbide-containing formation element：Weigh various material powder dispensings, by weight percentage Ni
5~20wt% is accounted for, Co accounts for 0~20wt%, and Mo accounts for 2~10wt%, and W accounts for 2~10wt%, TiC0.7N0.3For surplus；By the powder weighed
Mix and pass through ball milling, filtering, drying, mix forming agent, compressing obtain cermet green compact；Cermet green compact are in vacuum
500~700 DEG C are warming up in sintering furnace, programming rate is 1~5 DEG C/min, and vacuum is 5~15Pa, and is incubated 1~2h, shape
Into the cermet base substrate of carbide-containing formation element；
（2）Hydrogeneous carburizing medium is prepared：First weigh the TiH that granularity is 0.5 ~ 1.5 μm2Powder is added in absolute ethyl alcohol and formed
TiH2Account for 35wt% mixed liquor, then carry out 20 ~ 40min ultrasonic disperse processing, and 80 ~ 100 DEG C and vacuum be 10~
1h is dried in vacuo under the conditions of 20Pa；Solution is prepared by solvent of deionized water and absolute ethyl alcohol mixed liquor again, by concentration be 0.1~
0.8mol/L adds tetraethyl orthosilicate, by 9 times of the tetraethyl orthosilicate concentration TiH added by ultrasonic disperse2Powder, is used in combination
CH3COOH adjusts pH value to 3~6, then stirs 8~24h at 60~80 DEG C in magnetic stirring apparatus, and at 120 ~ 150 DEG C
1~3h is dried, SiO is obtained2Coat TiH2Core/shell structure powder；Again by SiO2Coat TiH2Core/shell structure powder, external diameter
It is less than 30 μm less than 8nm, length and specific surface area is more than 350m2/ g multi-walled carbon nanotube, BaCO3Three kinds of materials by weight hundred
Divide and compare 3:2:1 mixing, and 1 ~ 2h of ball milling in planetary ball mill, are made hydrogeneous carburizing medium；
（3）Filling of the green compact in hydrogeneous carburizing medium：First hydrogeneous carburizing medium is fitted into graphite crucible, then removing is molded
The cermet green compact embedment of agent；The weight ratio of hydrogeneous carburizing medium and de- forming agent cermet green compact is 5:1, and ensure to take off
Hydrogeneous carburizing medium thickness around forming agent cermet green compact is more than 5mm；Then consolidation is hydrogeneous under 5 ~ 15MPa pressure oozes
Carbon medium, makes its volume-diminished to the 40 ~ 60% of loose state；With threaded lid sealed graphite crucible, carburizing medium is prevented
Effusion；
（4）It is prepared by surface self-lubricating Ti (C, N) based ceramic metal：1350~1500 DEG C of 1~3h of insulation, carbon in vacuum sintering furnace
Element is spread from hydrogeneous carburizing medium to metal ceramic surface, forms the surface self-lubricating layer of 300 ~ 850 μ m-thicks, final system in situ
It is standby go out surface self-lubricating Ti (C, N) based ceramic metal.
Surface self-lubricating Ti (C, N) based ceramic metal preparation method that the carbon gradient of the present invention is formed in situ, its is further
It is characterised by：
（1）Ball-milling Time is 24~72h when prepared by cermet green compact, and filtering uses 400 eye mesh screens, dries at 85~100 DEG C
Carry out, mix buna forming agent by the 50~120% of metal ceramic powder weight, be pressed under 300~400MPa pressure
Type；
（2）When hydrogeneous carburizing medium is prepared, the frequency of ultrasonic wave is 4 × 10 when ultrasonically treated4Hz, power is 100W, is prepared molten
Deionized water and the volume ratio of absolute ethyl alcohol are 1 in the solvent that liquid is used:10, prepare SiO2Coat TiH2Core/shell structure powder
When, the speed of magnetic agitation is 20~50r/min, core/shell structure powder, multi-walled carbon nanotube, BaCO3Mix planetary ball mill
When, rotating speed is 300r/min;
（3）The graphite material rupture strength of green compact graphite crucible used when being loaded in carburizing medium is more than 20MPa；
（4）When prepared by surface self-lubricating Ti (C, N) based ceramic metal, first it is warming up to 500~700 DEG C with 5~10 DEG C/min and protects
1~2h of temperature；Then 1100~1250 DEG C are warming up to 5~10 DEG C/min and are incubated 1~3h；It is warming up to again with 5~10 DEG C/min
1350~1500 DEG C and 1~3h of insulation, sintering vacuum is 1~5Pa；Cooling rate after terminating is 1~8 DEG C/min.
The advantage of the invention is that：（1）Carburizing body is made with the cermet base substrate of carbide-containing formation element, in sintering
During in-situ accomplishes case-carbonizing, this technique compared with traditional first sintering recarburization is more succinct, and is not in crystal grain two
It is secondary the problem of grow up；（2）Metal hydride TiH is introduced in carburizer2, H is decomposited in sintering process2And and multi-wall carbon nano-tube
C+2H occurs for pipe2=CH4, CH4=[C]+H2, the activated carbon atom of formation, which enters in metal, realizes carburizing；SiO2It is coated on TiH2Table
Face can control H2Rate of release, it is to avoid rapidly depleting；（3）Carbide former in carburizing body in sintering process with carbon
Element reaction formation carbide, can promote activated carbon atom from carburizing medium to metal-ceramic matrix diffusion into the surface, be conducive to
The absorption of activated carbon atom and the raising of carburizing efficiency；（4）Proposition ensures that carburizing is situated between by controlling the degree of packing of carburizing medium
Contact between matter and cermet, improves carburizing efficiency；（5）Multi-walled carbon nanotube is used for carbon source, the small reaction of its granularity is lived
Bigger, the carburizing efficiency high of property.
Brief description of the drawings
The technique of surface self-lubricating Ti (C, N) based ceramic metal preparation method that the carbon gradient of Fig. 1 present invention is formed in situ
Schematic diagram.
Embodiment
Example 1：Surface self-lubricating Ti (C, N) based ceramic metal is prepared according to the following steps：
（1）The cermet body preparation of carbide-containing formation element：Weigh various material powder dispensings, by weight percentage Ni
8wt% is accounted for, Co accounts for 7wt%, and Mo accounts for 3wt%, and W accounts for 4wt%, TiC0.7N0.3For surplus；The powder weighed is mixed and passes through 28h balls
Time consuming, 400 mesh sieve net filtrations, 100 DEG C of dryings mix buna forming agent by the 90% of metal ceramic powder weight,
It is compressing under 320MPa pressure to obtain cermet green compact；Cermet green compact are warming up to 540 DEG C, liter in vacuum sintering furnace
Warm speed is 2 DEG C/min, and vacuum is 7Pa, and is incubated 1h, forms the cermet base substrate of carbide-containing formation element；
（2）Hydrogeneous carburizing medium is prepared：First weigh the TiH that granularity is 0.6 μm2Powder, which is added in absolute ethyl alcohol, forms TiH2Account for
35wt% mixed liquor, then carries out 26min ultrasonic disperse processing, the frequency of ultrasonic wave is 4 × 104Hz, power is 100W,
And it is dried in vacuo 1h under the conditions of 80 DEG C and vacuum are 15Pa；Again using volume ratio as 1:10 deionized water and absolute ethyl alcohol
Mixed liquor is that solvent prepares solution, is that 0.2mol/L adds Polycarbosilane by concentration, is that 1.8mol/L is added by super by concentration
The scattered TiH of sound2Powder, and use CH3COOH adjusts pH value to 3, then stirs 9h at 65 DEG C in magnetic stirring apparatus, magnetic force is stirred
The speed mixed is 27r/min, and dries 1h at 140 DEG C, obtains SiO2Coat TiH2Core/shell structure powder；Again by SiO2Bag
Cover TiH2Core/shell structure powder, external diameter, which is less than 8nm, length and is less than 30 μm and specific surface area, is more than 350m2/ g many wall carbon are received
Mitron, BaCO3Three kinds of substances in percentage by weight 3:2:1 mixing, and the ball milling 1h in planetary ball mill, rotating speed is 300r/
Min, is made hydrogeneous carburizing medium；
（3）Filling of the green compact in hydrogeneous carburizing medium：First hydrogeneous carburizing medium is fitted into graphite crucible, the stone of graphite crucible
Black material rupture strength is more than 20MPa, then the cermet green compact for removing forming agent are embedded to；Hydrogeneous carburizing medium and de- shaping
The weight ratio of agent cermet green compact is 5:1, and ensure the hydrogeneous carburizing medium thickness around de- forming agent cermet green compact
More than 5mm；Then the hydrogeneous carburizing medium of consolidation under 6MPa pressure, makes its volume-diminished to the 48% of loose state；With threaded
Lid sealed graphite crucible, prevent carburizing medium from escaping；
（4）It is prepared by surface self-lubricating Ti (C, N) based ceramic metal：First it is warming up to 620 DEG C with 5 DEG C/min and is incubated 1h；Then with 6
DEG C/min is warming up to 1220 DEG C and is incubated 1h；1420 DEG C being warming up to 6 DEG C/min again and being incubated 1h, sintering vacuum is 2Pa；Burn
Cooling rate after terminating is 6 DEG C/min, and carbon is spread from hydrogeneous carburizing medium to metal ceramic surface, forms 750 μm
Thick surface self-lubricating layer, surface self-lubricating Ti (C, N) based ceramic metal is prepared in final original position.
Example 2：Surface self-lubricating Ti (C, N) based ceramic metal is prepared according to the following steps：
（1）The cermet body preparation of carbide-containing formation element：Weigh various material powder dispensings, by weight percentage Ni
12wt% is accounted for, Co accounts for 5wt%, and Mo accounts for 4wt%, and W accounts for 4wt%, TiC0.7N0.3For surplus；The powder weighed is mixed and passes through 72h balls
Time consuming, 400 mesh sieve net filtrations, 88 DEG C of dryings mix buna forming agent by the 100% of metal ceramic powder weight,
It is compressing under 390MPa pressure to obtain cermet green compact；Cermet green compact are warming up to 630 DEG C, liter in vacuum sintering furnace
Warm speed is 1 DEG C/min, and vacuum is 5Pa, and is incubated 1h, forms the cermet base substrate of carbide-containing formation element；
（2）Hydrogeneous carburizing medium is prepared：First weigh the TiH that granularity is 0.8 μm2Powder, which is added in absolute ethyl alcohol, forms TiH2Account for
35wt% mixed liquor, then carries out 30min ultrasonic disperse processing, the frequency of ultrasonic wave is 4 × 104Hz, power is 100W,
And it is dried in vacuo 1h under the conditions of 100 DEG C and vacuum are 20Pa；Again using volume ratio as 1:10 deionized water and absolute ethyl alcohol
Mixed liquor for solvent prepare solution, by concentration be 0.5mol/L add Polycarbosilane, by concentration be 4.5mol/L add pass through
The TiH of ultrasonic disperse2Powder, and use CH3COOH adjusts pH value to 6, then stirs 20h, magnetic at 70 DEG C in magnetic stirring apparatus
The speed of power stirring is 40r/min, and dries 2h at 128 DEG C, obtains SiO2Coat TiH2Core/shell structure powder；Again will
SiO2Coat TiH2Core/shell structure powder, external diameter, which is less than 8nm, length and is less than 30 μm and specific surface area, is more than 350m2/ g's is more
Wall carbon nano tube, BaCO3Three kinds of substances in percentage by weight 3:2:1 mixes, and the ball milling 2h in planetary ball mill, and rotating speed is
300r/min, is made hydrogeneous carburizing medium；
（3）Filling of the green compact in hydrogeneous carburizing medium：First hydrogeneous carburizing medium is fitted into graphite crucible, the stone of graphite crucible
Black material rupture strength is more than 20MPa, then the cermet green compact for removing forming agent are embedded to；Hydrogeneous carburizing medium and de- shaping
The weight ratio of agent cermet green compact is 5:1, and ensure the hydrogeneous carburizing medium thickness around de- forming agent cermet green compact
More than 5mm；Then the hydrogeneous carburizing medium of consolidation under 8MPa pressure, makes its volume-diminished to the 52% of loose state；With threaded
Lid sealed graphite crucible, prevent carburizing medium from escaping；
（4）It is prepared by surface self-lubricating Ti (C, N) based ceramic metal：First it is warming up to 700 DEG C with 8 DEG C/min and is incubated 2h；Then with 8
DEG C/min is warming up to 1250 DEG C and is incubated 2h；1430 DEG C being warming up to 7 DEG C/min again and being incubated 2h, sintering vacuum is 1Pa；Burn
Cooling rate after terminating is 4 DEG C/min, and carbon is spread from hydrogeneous carburizing medium to metal ceramic surface, forms 650 μm
Thick surface self-lubricating layer, surface self-lubricating Ti (C, N) based ceramic metal is prepared in final original position.
Claims (2)
1. surface self-lubricating Ti (C, N) based ceramic metal preparation method that a kind of carbon gradient is formed in situ, it is characterised in that successively
Comprise the steps of：
（1）The cermet body preparation of carbide-containing formation element：Weigh various material powder dispensings, by weight percentage Ni
5~20wt% is accounted for, Co accounts for 0~20wt%, and Mo accounts for 2~10wt%, and W accounts for 2~10wt%, TiC0.7N0.3For surplus；By the powder weighed
Mix and pass through ball milling, filtering, drying, mix forming agent, compressing obtain cermet green compact；Cermet green compact are in vacuum
500~700 DEG C are warming up in sintering furnace, programming rate is 1~5 DEG C/min, and vacuum is 5~15Pa, and is incubated 1~2h, shape
Into the cermet base substrate of carbide-containing formation element；
（2）Hydrogeneous carburizing medium is prepared：First weigh the TiH that granularity is 0.5 ~ 1.5 μm2Powder is added in absolute ethyl alcohol and formed
TiH2Account for 35wt% mixed liquor, then carry out 20 ~ 40min ultrasonic disperse processing, and 80 ~ 100 DEG C and vacuum be 10~
1h is dried in vacuo under the conditions of 20Pa；Solution is prepared by solvent of deionized water and absolute ethyl alcohol mixed liquor again, by concentration be 0.1~
0.8mol/L adds tetraethyl orthosilicate, by 9 times of the tetraethyl orthosilicate concentration TiH added by ultrasonic disperse2Powder, is used in combination
CH3COOH adjusts pH value to 3~6, then stirs 8~24h at 60~80 DEG C in magnetic stirring apparatus, and at 120 ~ 150 DEG C
1~3h is dried, SiO is obtained2Coat TiH2Core/shell structure powder；Again by SiO2Coat TiH2Core/shell structure powder, external diameter
It is less than 30 μm less than 8nm, length and specific surface area is more than 350m2/ g multi-walled carbon nanotube, BaCO3Three kinds of materials by weight hundred
Divide and compare 3:2:1 mixing, and 1 ~ 2h of ball milling in planetary ball mill, are made hydrogeneous carburizing medium；
（3）Filling of the green compact in hydrogeneous carburizing medium：First hydrogeneous carburizing medium is fitted into graphite crucible, then removing is molded
The cermet green compact embedment of agent；The weight ratio of hydrogeneous carburizing medium and de- forming agent cermet green compact is 5:1, and ensure to take off
Hydrogeneous carburizing medium thickness around forming agent cermet green compact is more than 5mm；Then consolidation is hydrogeneous under 5 ~ 15MPa pressure oozes
Carbon medium, makes its volume-diminished to the 40 ~ 60% of loose state；With threaded lid sealed graphite crucible, carburizing medium is prevented
Effusion；
（4）It is prepared by surface self-lubricating Ti (C, N) based ceramic metal：1350~1500 DEG C of 1~3h of insulation, carbon in vacuum sintering furnace
Element is spread from hydrogeneous carburizing medium to metal ceramic surface, forms the surface self-lubricating layer of 300 ~ 850 μ m-thicks, final system in situ
It is standby go out surface self-lubricating Ti (C, N) based ceramic metal.
2. surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient according to claim 1 is formed in situ,
Further characterized in that：
（1）Ball-milling Time is 24~72h when prepared by cermet green compact, and filtering uses 400 eye mesh screens, dries at 85~100 DEG C
Carry out, mix buna forming agent by the 50~120% of metal ceramic powder weight, be pressed under 300~400MPa pressure
Type；
（2）When hydrogeneous carburizing medium is prepared, the frequency of ultrasonic wave is 4 × 10 when ultrasonically treated4Hz, power is 100W, prepares solution
Deionized water and the volume ratio of absolute ethyl alcohol are 1 in the solvent used:10, prepare SiO2Coat TiH2Core/shell structure powder
When, the speed of magnetic agitation is 20~50r/min, core/shell structure powder, multi-walled carbon nanotube, BaCO3Mix planetary ball mill
When, rotating speed is 300r/min;
（3）The graphite material rupture strength of green compact graphite crucible used when being loaded in carburizing medium is more than 20MPa；
（4）When prepared by surface self-lubricating Ti (C, N) based ceramic metal, first it is warming up to 500~700 DEG C with 5~10 DEG C/min and protects
1~2h of temperature；Then 1100~1250 DEG C are warming up to 5~10 DEG C/min and are incubated 1~3h；It is warming up to again with 5~10 DEG C/min
1350~1500 DEG C and 1~3h of insulation, sintering vacuum is 1~5Pa；Cooling rate after terminating is 1~8 DEG C/min.
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| US20020043130A1 (en) * | 2000-06-19 | 2002-04-18 | Byoung-Kee Kim | Method of production WC/Co cemented carbide using grain growth inhibitor |
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