CN107142406B - 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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- CN107142406B CN107142406B CN201710300031.2A CN201710300031A CN107142406B CN 107142406 B CN107142406 B CN 107142406B CN 201710300031 A CN201710300031 A CN 201710300031A CN 107142406 B CN107142406 B CN 107142406B
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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 a kind of surface self-lubricating Ti (C, N) based ceramic metal preparation methods that carbon gradient is formed in situ, it is characterized in that first forming the cermet green body of carbide-containing formation element in 500~700 DEG C of 1~2h of heat preservation；Then by SiO2Coat TiH2Core/shell structure powder, outer diameter be less than 8nm, length less than 30 μm and specific surface area be greater than 350m2The multi-walled carbon nanotube of/g, BaCO3Three kinds of substances in percentage by weight 3:2:1 mixed preparings go out hydrogeneous carburizing medium；Again by green compact be embedded to it is in hydrogeneous carburizing medium and under 5 ~ 15MPa pressure consolidation；Liquid-phase sintering is finally carried out, surface self-lubricating Ti (C, N) based ceramic metal is prepared.It grows up the problem of serious, carburizing time is long, low efficiency the present invention overcomes crystal grain existing for prior art, is formed in situ based on carbon gradient prepares surface self-lubricating Ti (C, N) based ceramic metal during the sintering process.
Description
Technical field
The present invention relates to a kind of preparation method of cermet, in particular to the surface self-lubricating Ti that is formed in situ of carbon gradient
(C, N) based ceramic metal preparation method, belongs to field of compound material.
Background technique
Ti (C, N) based ceramic metal is the novel tool die material to grow up on the basis of TiC based ceramic metal, feature
It is with Ti (C, N) as its main hard phase, it is a kind of cutter Materials for High Speed Cutting better than common WC base cemented carbide,
It cannot be only used for the turning of steel and the Milling Process of steel and cast iron, and can be used for wear resistant corrosion resistant environment, prospect of the application
It is very wide.As a kind of tool die material, wear-resisting property is very crucial, forms high-carbon gradient layer in metal ceramic surface,
Its coefficient of friction is advantageously reduced, self-lubricating function is played, Carburization Treatment is most common method.
CN200910032962.4 disclose a kind of enhancing of gradient structure carbon nano-tube Ti (C, N) based ceramic metal and its
Preparation method.The cermet composition mass fraction are as follows: C is 6.5~8.0, and wherein the carbon of 0.5-1.0 is introduced by carbon nanotubes, N
It is 36~45, Ni for 1.5~2.5, Ti be 20~32, Mo be 10~18, W is 6~10.Raw material is configured to meet by the invention
The mixture of composition is stated, then obtains sintered body through mixing, addition forming agent, compression moulding, degreasing, vacuum-sintering.Again should
Sintered body is placed in double-deck glow plasma carburising furnace 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, being filled in furnace argon pressure is 20-40Pa, and treatment temperature is 1100-1200 DEG C, when processing
Between be 90-180min.CN94119863.4 discloses a kind of method for carburizing of ceramic material.By ceramics (Al2O3、ZrO2Or oxidation
Object series) HF solution is immersed, to carry out being deep into 0.01 μm~100 μm of surface treatment to it；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 and drying are carried out afterwards, obtain the carbon-impregnated carburizing sliding material for penetrating into 0.01 μm~100 μm.In this way, carburizing exists
It is 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, carburizing time is long, inefficient；And
And cermet material is easy to appear crystal grain and grows up under high temperature, and material property is caused to decline.Therefore, searching prepares surface self-lubricating
The new method of cermet material is very necessary.
Summary of the invention
When the present invention is for surface self-lubricating cermet material is prepared at present, crystal grain existing for " sintering+carburizing " technique
It grows up the problem of serious, carburizing time is long, low efficiency, proposes the cermet base that will first prepare carbide-containing formation element
Body, then by SiO2Coat TiH2Core/shell structure powder, multi-walled carbon nanotube, BaCO3Shape is uniformly mixed when mixing planetary ball mill
At hydrogeneous carburizing medium, then porous green compact are put into carburizing medium and carry out consolidation, finally carries out preparation when liquid-phase sintering
Surface self-lubricating Ti (C, N) based ceramic metal out.
Surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient of the invention is formed in situ, feature exist
In successively comprising the steps of:
(1) various raw material powder ingredients, by weight percentage the cermet body preparation of carbide-containing formation element: are weighed
5~20wt% is accounted for than Ni, Co accounts for 0~20wt%, and Mo accounts for 2~10wt%, and W accounts for 2~10wt%, TiC0.7N0.3For surplus；It will be weighed
Powder mix and pass through ball milling, filtering, drying, mix forming agent, compression moulding obtains cermet green compact；Cermet green compact exist
It is warming up to 500~700 DEG C in vacuum sintering furnace, heating rate is 1~5 DEG C/min, and vacuum degree is 5~15Pa, and keep the temperature 1~
2h forms the cermet green body of carbide-containing formation element；
(2) hydrogeneous carburizing medium is prepared: first weighing the TiH that granularity is 0.5 ~ 1.5 μm2Powder is added to shape in dehydrated alcohol
At TiH2The mixed liquor of 35wt% is accounted for, the ultrasonic disperse processing of 20 ~ 40min is then carried out, and is 10 in 80 ~ 100 DEG C and vacuum degree
1h is dried in vacuo under the conditions of~20Pa；Solution is prepared using deionized water and dehydrated alcohol mixed liquor as solvent again, is 0.1 by concentration
Ethyl orthosilicate is added in~0.8mol/L, and the TiH for passing through ultrasonic disperse is added by 9 times of ethyl orthosilicate concentration2Powder is used in combination
CH3COOH adjusts pH value to 3~6, the then stirring 8 at 60~80 DEG C~for 24 hours in magnetic stirring apparatus, and at 120 ~ 150 DEG C
Dry 1~3h, obtains SiO2Coat TiH2Core/shell structure powder；Again by SiO2Coat TiH2Core/shell structure powder, outer diameter
Less than 8nm, length less than 30 μm and specific surface area be greater than 350m2The multi-walled carbon nanotube of/g, BaCO3Three kinds of substances by weight hundred
Divide and mixed than 3:2:1, and 1 ~ 2h of ball milling in planetary ball mill, hydrogeneous carburizing medium is made；
(3) hydrogeneous carburizing medium: being first fitted into graphite crucible by filling of the green compact in hydrogeneous carburizing medium, then will removing
The cermet green compact of forming agent are embedded to；The weight ratio of hydrogeneous carburizing medium and de- forming agent cermet green compact is 5:1, and really
The hydrogeneous carburizing medium thickness protected around de- forming agent cermet green compact is greater than 5mm；Then consolidation contains under 5 ~ 15MPa pressure
Hydrogen carbonizing medium makes its volume-diminished to the 40 ~ 60% of loose state；With threaded lid sealed graphite crucible, carburizing is prevented
Medium evolution；
(4) surface self-lubricating Ti (C, N) based ceramic metal prepare: in vacuum sintering furnace 1350~1500 DEG C heat preservation 1~
3h, carbon are spread from hydrogeneous carburizing medium to metal ceramic surface, form the surface self-lubricating layer of 300 ~ 850 μ m-thicks, finally
Surface self-lubricating Ti (C, N) based ceramic metal is prepared in situ out.
Surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient of the invention is formed in situ, further
It is characterized in that:
(1) Ball-milling Time is 24~72h when prepared by cermet green compact, and filtering uses 400 mesh screens, it is dry 85~
100 DEG C of progress mix buna forming agent by the 50~120% of metal ceramic powder weight, under 300~400MPa pressure
Compression moulding；
(2) when hydrogeneous carburizing medium is prepared, the frequency of ultrasonic wave is 4 × 10 when ultrasonic treatment4Hz, power 100W, matches
Deionized water and the volume ratio of dehydrated alcohol are 1:10 in the solvent that solution processed uses, and prepare SiO2Coat TiH2Core/shell structure
When powder, the speed of magnetic agitation is 20~50r/min, core/shell structure powder, multi-walled carbon nanotube, BaCO3Mix planet ball
When mill, revolving speed 300r/min;
(3) the graphite material flexural strength of graphite crucible used is greater than 20MPa when green compact load in carburizing medium；
(4) when prepared by surface self-lubricating Ti (C, N) based ceramic metal, 500~700 DEG C first are warming up to 5~10 DEG C/min
And keep the temperature 1~2h；Then 1100~1250 DEG C are warming up to 5~10 DEG C/min and keep the temperature 1~3h；Again with 5~10 DEG C/min liter
Temperature is to 1350~1500 DEG C and keeps the temperature 1~3h, and sintering vacuum degree is 1~5Pa；Cooling rate after sintering is 1~8 DEG C/
min。
The present invention has the advantages that (1) makees carburizing body with the cermet green body of carbide-containing formation element, it is being sintered
In-situ accomplishes case-carbonizing in the process, this technique compared with traditional first sintering recarburization is more succinct, and there is no crystal grain two
Secondary the problem of growing up；(2) metal hydride TiH is introduced in carburizer2, H is decomposited during the sintering process2And and multi-wall carbon nano-tube
C+2H occurs for pipe2=CH4, CH4=[C]+H2, the active carbon atom of formation, which enters, realizes carburizing in metal；SiO2It is coated on TiH2Table
Face can control H2Rate of release avoids rapidly depleting；(3) carbide former in carburizing body during the sintering process with carbon
Element reaction forms carbide, and active carbon atom can be promoted from carburizing medium to metal-ceramic matrix diffusion into the surface, be conducive to
The absorption of active carbon atom and the raising of carburizing efficiency；(4) degree of packing by controlling carburizing medium is proposed to ensure that carburizing is situated between
Contact between matter and cermet improves carburizing efficiency；(5) use multi-walled carbon nanotube for carbon source, the small reaction of granularity is lived
Property is bigger, and carburizing is high-efficient.
Detailed description of the invention
The technique of surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient Fig. 1 of the invention is formed in situ
Schematic diagram.
Specific embodiment
Example 1: surface self-lubricating Ti (C, N) based ceramic metal is prepared according to the following steps:
(1) various raw material powder ingredients, by weight percentage the cermet body preparation of carbide-containing formation element: are weighed
8wt% is accounted for than Ni, Co accounts for 7wt%, and Mo accounts for 3wt%, and W accounts for 4wt%, TiC0.7N0.3For surplus；Weighed powder is mixed and passed through
28h Ball-milling Time, 400 mesh net filtrations, 100 DEG C of dryings, by 90% incorporation buna molding of metal ceramic powder weight
Agent, compression moulding obtains cermet green compact under 320MPa pressure；Cermet green compact are warming up to 540 in vacuum sintering furnace
DEG C, heating rate is 2 DEG C/min, vacuum degree 7Pa, and keeps the temperature 1h, forms the cermet base of carbide-containing formation element
Body；
(2) hydrogeneous carburizing medium is prepared: first weighing the TiH that granularity is 0.6 μm2Powder is added in dehydrated alcohol and is formed
TiH2The mixed liquor of 35wt% is accounted for, the ultrasonic disperse processing of 26min is then carried out, the frequency of ultrasonic wave is 4 × 104Hz, power are
100W, and 1h is dried in vacuo under the conditions of 80 DEG C and vacuum degree are 15Pa；Again with volume ratio for 1:10 deionized water with it is anhydrous
The mixed liquor of ethyl alcohol is that solvent prepares solution, is that Polycarbosilane is added in 0.2mol/L by concentration, is 1.8mol/L addition by concentration
By the TiH of ultrasonic disperse2Powder, and use CH3COOH adjusts pH value to 3, then stirs 9h at 65 DEG C in magnetic stirring apparatus,
The speed of magnetic agitation is 27r/min, and the dry 1h at 140 DEG C, obtains SiO2Coat TiH2Core/shell structure powder；Again will
SiO2Coat TiH2Core/shell structure powder, outer diameter be less than 8nm, length less than 30 μm and specific surface area be greater than 350m2/ g's is more
Wall carbon nano tube, BaCO3Three kinds of substances in percentage by weight 3:2:1 mixing, and the ball milling 1h in planetary ball mill, revolving speed are
Hydrogeneous carburizing medium is made in 300r/min；
(3) filling of the green compact in hydrogeneous carburizing medium: first hydrogeneous carburizing medium is fitted into graphite crucible, graphite crucible
Graphite material flexural strength be greater than 20MPa, then will remove forming agent cermet green compact embedment；Hydrogeneous carburizing medium and de-
The weight ratio of forming agent cermet green compact is 5:1, and ensures the hydrogeneous carburizing medium around de- forming agent cermet green compact
Thickness is greater than 5mm；Then the hydrogeneous carburizing medium of consolidation under 6MPa pressure, makes its volume-diminished to the 48% of loose state；With band
The lid sealed graphite crucible of screw thread, prevents carburizing medium from escaping；
(4) prepared by surface self-lubricating Ti (C, N) based ceramic metal: being first warming up to 620 DEG C with 5 DEG C/min and keeps the temperature 1h；So
1220 DEG C are warming up to 6 DEG C/min afterwards and keep the temperature 1h；1420 DEG C are warming up to 6 DEG C/min again and keeps the temperature 1h, and sintering vacuum degree is
2Pa；Cooling rate after sintering is 6 DEG C/min, and carbon is spread from hydrogeneous carburizing medium to metal ceramic surface, is formed
Surface self-lubricating Ti (C, N) based ceramic metal is finally prepared in situ out in the surface self-lubricating layer of 750 μ m-thicks.
Example 2: surface self-lubricating Ti (C, N) based ceramic metal is prepared according to the following steps:
(1) various raw material powder ingredients, by weight percentage the cermet body preparation of carbide-containing formation element: are weighed
12wt% is accounted for than Ni, Co accounts for 5wt%, and Mo accounts for 4wt%, and W accounts for 4wt%, TiC0.7N0.3For surplus；Weighed powder is mixed and passed through
72h Ball-milling Time, 400 mesh net filtrations, 88 DEG C of dryings, by 100% incorporation buna molding of metal ceramic powder weight
Agent, compression moulding obtains cermet green compact under 390MPa pressure；Cermet green compact are warming up to 630 in vacuum sintering furnace
DEG C, heating rate is 1 DEG C/min, vacuum degree 5Pa, and keeps the temperature 1h, forms the cermet base of carbide-containing formation element
Body；
(2) hydrogeneous carburizing medium is prepared: first weighing the TiH that granularity is 0.8 μm2Powder is added in dehydrated alcohol and is formed
TiH2The mixed liquor of 35wt% is accounted for, the ultrasonic disperse processing of 30min is then carried out, the frequency of ultrasonic wave is 4 × 104Hz, power are
100W, and 1h is dried in vacuo under the conditions of 100 DEG C and vacuum degree are 20Pa；Again with volume ratio for 1:10 deionized water with it is anhydrous
The mixed liquor of ethyl alcohol is that solvent prepares solution, is that Polycarbosilane is added in 0.5mol/L by concentration, is 4.5mol/L addition by concentration
By the TiH of ultrasonic disperse2Powder, and use CH3COOH adjusts pH value to 6, then stirs at 70 DEG C in magnetic stirring apparatus
20h, the speed of magnetic agitation are 40r/min, and the dry 2h at 128 DEG C, obtain SiO2Coat TiH2Core/shell structure powder；
Again by SiO2Coat TiH2Core/shell structure powder, outer diameter be less than 8nm, length less than 30 μm and specific surface area be greater than 350m2/g
Multi-walled carbon nanotube, BaCO3Three kinds of substances in percentage by weight 3:2:1 mixing, and the ball milling 2h in planetary ball mill, revolving speed
For 300r/min, hydrogeneous carburizing medium is made；
(3) filling of the green compact in hydrogeneous carburizing medium: first hydrogeneous carburizing medium is fitted into graphite crucible, graphite crucible
Graphite material flexural strength be greater than 20MPa, then will remove forming agent cermet green compact embedment；Hydrogeneous carburizing medium and de-
The weight ratio of forming agent cermet green compact is 5:1, and ensures the hydrogeneous carburizing medium around de- forming agent cermet green compact
Thickness is greater than 5mm；Then the hydrogeneous carburizing medium of consolidation under 8MPa pressure, makes its volume-diminished to the 52% of loose state；With band
The lid sealed graphite crucible of screw thread, prevents carburizing medium from escaping；
(4) prepared by surface self-lubricating Ti (C, N) based ceramic metal: being first warming up to 700 DEG C with 8 DEG C/min and keeps the temperature 2h；So
1250 DEG C are warming up to 8 DEG C/min afterwards and keep the temperature 2h；1430 DEG C are warming up to 7 DEG C/min again and keeps the temperature 2h, and sintering vacuum degree is
1Pa；Cooling rate after sintering is 4 DEG C/min, and carbon is spread from hydrogeneous carburizing medium to metal ceramic surface, is formed
Surface self-lubricating Ti (C, N) based ceramic metal is finally prepared in situ out in the surface self-lubricating layer of 650 μ m-thicks.
Claims (2)
1. a kind of surface self-lubricating Ti (C, N) based ceramic metal preparation method that carbon gradient is formed in situ, it is characterised in that successively
It comprises the steps of:
(1) various raw material powder ingredients, by weight percentage Ni the cermet body preparation of carbide-containing formation element: are weighed
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 weighed powder
Mix and pass through ball milling, filtering, drying, mix forming agent, compression moulding obtains cermet green compact；Cermet green compact are in vacuum
500~700 DEG C are warming up in sintering furnace, heating rate is 1~5 DEG C/min, and vacuum degree is 5~15Pa, and keeps the temperature 1~2h, shape
At the cermet green body of carbide-containing formation element；
(2) hydrogeneous carburizing medium is prepared: first weighing the TiH that granularity is 0.5 ~ 1.5 μm2Powder is added in dehydrated alcohol and is formed
TiH2Account for the mixed liquor of 35wt%, then carry out the ultrasonic disperse processing of 20 ~ 40min, and 80 ~ 100 DEG C and vacuum degree be 10~
1h is dried in vacuo under the conditions of 20Pa；Prepare solution by solvent of deionized water and dehydrated alcohol mixed liquor again, by concentration for 0.1~
Ethyl orthosilicate is added in 0.8mol/L, and the TiH for passing through ultrasonic disperse is added by 9 times of ethyl orthosilicate concentration2Powder is used in combination
CH3COOH adjusts pH value to 3~6, the then stirring 8 at 60~80 DEG C~for 24 hours in magnetic stirring apparatus, and at 120 ~ 150 DEG C
Dry 1~3h, obtains SiO2Coat TiH2Core/shell structure powder；Again by SiO2Coat TiH2Core/shell structure powder, outer diameter
Less than 8nm, length less than 30 μm and specific surface area be greater than 350m2The multi-walled carbon nanotube of/g, BaCO3Three kinds of substances by weight hundred
Divide and mixed than 3:2:1, and 1 ~ 2h of ball milling in planetary ball mill, hydrogeneous carburizing medium is made；
(3) hydrogeneous carburizing medium: being first fitted into graphite crucible by filling of the green compact in hydrogeneous carburizing medium, then removing is formed
The cermet green compact of agent are embedded to；The weight ratio of hydrogeneous carburizing medium and de- forming agent cermet green compact is 5:1, and ensures to take off
Hydrogeneous carburizing medium thickness around forming agent cermet green compact is greater than 5mm；Then the hydrogeneous infiltration of consolidation under 5 ~ 15MPa pressure
Carbon medium makes its volume-diminished to the 40 ~ 60% of loose state；With threaded lid sealed graphite crucible, carburizing medium is prevented
Evolution；
(4) prepared by surface self-lubricating Ti (C, N) based ceramic metal: 1350~1500 DEG C of 1~3h of heat preservation, 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
Standby surface self-lubricating Ti (C, N) based ceramic metal out.
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 mesh screens, dry at 85~100 DEG C
It carries out, mixes 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 ultrasonic treatment4Hz, power 100W prepare solution
Deionized water and the volume ratio of dehydrated alcohol are 1:10 in the solvent used, 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, revolving speed 300r/min;
(3) the graphite material flexural strength of graphite crucible used is greater than 20MPa when green compact load in carburizing medium；
(4) when prepared by surface self-lubricating Ti (C, N) based ceramic metal, first 500~700 DEG C is warming up to 5~10 DEG C/min and is protected
1~2h of temperature；Then 1100~1250 DEG C are warming up to 5~10 DEG C/min and keep the temperature 1~3h；It is warming up to again with 5~10 DEG C/min
1350~1500 DEG C and 1~3h of heat preservation, sintering vacuum degree is 1~5Pa；Cooling rate after sintering is 1~8 DEG C/min.
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|---|---|---|---|---|
| CN1526847A (en) * | 2003-09-24 | 2004-09-08 | 自贡硬质合金有限责任公司 | Hard alloy carburizing process resulting in gradient distribution of mechanical performance |
| CN101565790A (en) * | 2009-06-03 | 2009-10-28 | 南京航空航天大学 | Gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and preparation method thereof |
| CN103521770A (en) * | 2013-09-22 | 2014-01-22 | 成都工具研究所有限公司 | TiCN based metal ceramic |
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| CN101565790A (en) * | 2009-06-03 | 2009-10-28 | 南京航空航天大学 | Gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and preparation method thereof |
| CN103521770A (en) * | 2013-09-22 | 2014-01-22 | 成都工具研究所有限公司 | TiCN based metal ceramic |
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