CN107176604B - A kind of method that carbon materials surface in situ generates nano-carbide coating - Google Patents

A kind of method that carbon materials surface in situ generates nano-carbide coating Download PDF

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CN107176604B
CN107176604B CN201610133960.4A CN201610133960A CN107176604B CN 107176604 B CN107176604 B CN 107176604B CN 201610133960 A CN201610133960 A CN 201610133960A CN 107176604 B CN107176604 B CN 107176604B
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carbide
oxide
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王文广
马宗义
刘振宇
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Institute of Metal Research of CAS
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Abstract

The invention discloses a kind of methods that carbon materials surface in situ generates nano-carbide coating, belong to the technical field of material such as high-strength, superhard, wear-resisting and heat management.This method is that oxide sol or gel are prepared using sol-gel method, after being uniformly coated to carbon materials surface, handled after drying, sintering process, then through vacuum high-temperature, it realizes in-situ reducing-carburizing reagent, forms in-situ carbon compound nano coating on carbon materials surface.The present invention overcomes carbon materials surface free energy is low between the binders/matrix such as metal, ceramics and macromolecule poor compatibility, interface cohesion is bad the problems such as, the binding force between matrixes and carbon materials such as metal, ceramics and macromolecule is improved, the thermal impedance at interface between carbon materials and metal is reduced.The present invention can effectively improve the mechanics of composite materials such as carbon materials enhancing metal, ceramics and macromolecule, thermally conductive, conductive and wear-resisting etc. performances.

Description

A kind of method that carbon materials surface in situ generates nano-carbide coating
Technical field
The present invention relates to the technical field of material such as high-strength, superhard, wear-resisting and heat management, and in particular to a kind of carbon material Expect the method that surface in situ generates nano-carbide coating.
Background technique
Carbon possesses a variety of C-C bonding modes and crystal structure, can form the carbon material of a variety of configurations and excellent combination property Material, such as carbon fiber, diamond, crystalline flake graphite and multi-walled carbon nanotube, with density is low, thermal expansion coefficient is low, intensity is high, mould It measures the advantages that big, it is especially thermally conductive, electric conductivity is extremely excellent.Carbon materials are not only the important former material in traditional industry field The fields such as material and photoelectricity, national defence and aerospace are the grand strategy goods and materials of the high-tech industry of representative.
Although carbon materials possess many excellent performances, carbon materials are mostly particle or threadiness, are difficult individually to make With.Composite material is a kind of multiphase solid material being composed of two or more physics substance different with chemical property The advantages of expecting, can integrating different materials is learnt from other's strong points to offset one's weaknesses, and is one of important development direction of Material Field.Therefore, carbon materials It is considered as the ideal reinforcement of composite material.But between the other materials such as carbon materials and metal, ceramics, carbon, macromolecule Interface compatibility it is poor, such as wetability, chemical stability and mechanical compatibility between carbon materials and metallic aluminium etc. is all It is poor.In addition, the heat-conducting mode of the materials such as carbon materials and metal, ceramics and macromolecule is also completely different, this leads to carbon material Interface resistance between material and other materials is anti-higher, is unfavorable for giving full play to the characteristic of carbon material high thermal conductivity.
Research shows that can be effectively improved or improve carbon materials and other materials in the modification of carbon material surface alloying coating Compatibility between material.Currently, carrying out the coating modified technology of surface alloying to carbon materials has chemical vapor deposition (CVD), the micro- evaporation plating of physical vapour deposition (PVD) (PVD), magnetron sputtering, vacuum, chemical plating and elements diffusion method etc..Wherein, PVD and The methods of magnetron sputtering is relatively suitable for coating in the outer surface of smooth workpiece or material, and can not be in the inner surface of porous material Uniformly coating is formed, therefore is difficult to apply to the carbon materials such as diamond, carbon fiber, crystalline flake graphite;Chemical vapour deposition technique The process is more complicated, the unfavorable factors such as at high cost also greatly limit its industrial applications.Although in addition, Electroless Cu Plating and Ni Technology is highly developed, but belongs to chemical inertness between Cu, Ni and carbon, is hardly produced metallic compound, can not be fundamentally Solve the problems, such as poor compatibility between the materials such as carbon materials and metal, and the preparation process of the coatings such as chemical plating Ti, Al it is complicated, Cost is also higher, and is easily guided into impurity element, therefore is not also used widely.
" the diamond plating for 25-28 pages of the phase of the academic journal " diamond and grinding materials and grinding tool engineering " the 128th published for 2002 In the relationship of a technique and using effect " text, Wang Yanhui et al. is coated with using the micro- evaporation electroplating method of vacuum in diamond surface The diamond drop-off rate in diamond saw blade can be effectively reduced in Ti coating, improves the efficiency and service life of tool.This method Be by diamond and the pioneer containing titanium elements after mixing, can be in short distance using Ti atom under vacuum, hot conditions The principle of interior migration finally deposits Ti coating in diamond surface.However, theoretically the thickness of diamond surface titanium coating divides Cloth Normal Distribution, the i.e. titanium coating apart from titanium elements precursor more near position are thicker.In addition, the academic phase published in 2006 " vacuum slowly vapor deposition parameters on coating quality and the gold of 17-19 pages of the phase of periodical " diamond and grinding materials and grinding tool engineering " the 155th In the influence of a hard rock performance " text, Zhao Yucheng et al. has inquired into influence of the temperature to diamond, finds the condition at 1100 DEG C Under, excessively high temperature, which will increase the extension of diamond internal flaw and the expansion of Ti wrapping layer, leads to the chance of crystal cleavage, leads to gold The impact flexibility of hard rock sharply declines.
22-26 pages of volume 68 of the academic journal " Composites Part B:Engineering " of publication in 2015 “Thermal conductivity of Cu-Zr/diamond composites produced by high In a temperature-high pressure method " text, He etc. is under conditions of 1500 DEG C, 5GPa using infiltration legal system 677W/mK is reached for diamond/Cu-Zr composite material, the thermal conductivity of composite material, this is mainly due to Zr element and exists Being diffused into diamond surface and foring ZrC layers of nanoscale in Cu.
603-609 pages of volume 265 of the academic journal " Applied Surface Science " of publication in 2013 “Preparation of anti-oxidative SiC/SiO2coating on carbon fibers from In a vinyltriethoxysilane by sol-gel method " text, Xia et al. is using sol-gel method in carbon fiber Surface is coated with SiO2Coating, and under the protection of high-purity argon gas 1500 DEG C sintering 2 hours after, obtain SiC/SiO2Compound painting Layer, research shows that the coating can effectively improve the inoxidizability of carbon fiber.The experimental program is using the carbon in carbon fiber as also Former agent, but since there is carbon fiber good thermal stability and the SiC layer being initially formed to hinder the diffusion of carbon atom, even if 1500 DEG C, under conditions of sintering 2 hours still cannot provide raw material of the sufficient free carbon atom as reducing agent and carburizing reagent, lead It causes still to remain part SiO in coating2
Summary of the invention
The object of the present invention is to provide a kind of method that carbon materials surface in situ generates nano-carbide coating, this method Generated in-situ nano-sized carbon can be prepared on the carbon materials such as carbon fiber, diamond, crystalline flake graphite and multi-walled carbon nanotube surface The thickness of compound coating, the coating can be controlled in 10~20nm, and with coating, complete, coating uniform, chemical component are controllable, technique It is simple and reliable, low in cost, preparation temperature is low, is coated the small, carburizing reagent of carbon materials damage completely and has wide range of applications The advantages that.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of method that carbon materials surface in situ generates nano-carbide coating, this method comprises the following steps:
(1) single or doping oxide sol or gel, concentration 0.05 are prepared using traditional sol-gel method ~1.5 mol/Ls;
(2) carbon materials removing surface is clean;The carbon materials are that carbon fiber, graphite, diamond and multi wall carbon are received One or more of mitron;
(3) surface coating processing: according to the difference of coating object, the side such as ultrasonic oscillation, lifting, stirring or spraying is utilized Colloidal sol or gel are uniformly coated to carbon materials surface by method;
(4) be dried: by the carbon materials after the coating processing of surface be placed on 10~80 DEG C of drying, in clean room into Row is dried, and being dried the time is 1 hour~mono- week;
(5) pre-sintering is handled: under the conditions of atmosphere or protective atmosphere, by the carbon materials after coating and drying process It is put into resistance furnace, is warming up to 240-700 DEG C with the rate less than 10 DEG C/min, 20-300 minutes is kept the temperature, in carbon materials table Face forms coating;
(6) operating process of step (3)-step (5) is repeated, until the coating on carbon materials surface reaches required thickness;
(7) in-situ reducing-carburizing reagent: the carbon materials after sintering processes are put into vacuum drying oven, are evacuated in furnace Vacuum degree is less than 5 × 10-1After Pa, after being warming up to 700~1450 DEG C with the rate lower than 20 DEG C/min and keep the temperature 2~48 hours, It is furnace-cooled to room temperature under vacuum condition, completes in-situ reducing-carburizing reagent, finally obtains receiving for growth in situ on carbon materials surface Rice carbide coating.
In above-mentioned steps (1), the single oxide sol or gel, which refer to, has contained only titanium oxide, silica, oxidation The colloidal sol of one or more of chromium, vanadium oxide, zirconium oxide, niobium oxide, tantalum oxide, molybdenum oxide, tungsten oxide and rheium oxide is solidifying Glue;The oxide sol or gel of the doping refer to that addition is as reducing agent in single oxide sol (or gel) The colloidal sol (or gel) formed after the precursor of (carbon), wherein carbon atom in the precursor as reducing agent (carbon) of addition Mole is 0.1 to 10 times of oxide molar amount in colloidal sol or gel, and the precursor as reducing agent (carbon) is sucrose, poly- second The organic matters such as alkene, polyvinyl alcohol.It wherein, is undersaturation as the content of the precursor of reducing agent residual carbon after Pintsch process, Crack total amount of the content lower than carbon required for reduction-carburizing reagent of residual carbon.In addition, the addition of macromolecule organic is also The viscosity that colloidal sol or gel can be improved is conducive to increase coating layer thickness, and the repeatedly processes such as coating are reduced or avoided.
It is described that carbon materials removing surface is clean in above-mentioned steps (2), mainly according to the residual of carbon materials surface Excess or impurity the methods such as burn by pickling, alkali cleaning, organic solvent washing and/or high temperature.The residue on carbon materials surface Or impurity refers to the pollutant etc. introduced during the remaining catalyst of carbon material surface, organic matter etc. and production and storage, The gluing of remaining catalyst, carbon fiber surface on such as multi-walled carbon nanotube.
In above-mentioned steps (7), reducing agent used in the in-situ reducing-carburizing reagent is carbon, and the source of carbon is wrapped The organic matter for including doping in the carbon and/or colloidal sol (or gel) of coated object carbon materials itself cracks under the high temperature conditions to be remained Remaining carbon.
Become titanium carbide, carbonization in the group that carbon materials surface in situ generates nano-carbide coating using the above method One of silicon, chromium carbide, vanadium carbide, zirconium carbide, niobium carbide, tantalum carbide, molybdenum carbide, tungsten carbide and carbonization carbide such as rhenium or Several (as (Ta, Nb) C), nano-carbide coating with a thickness of 10~20nm.
It design principle of the present invention and has the beneficial effect that:
1, by the reaction equation of carbon reduced oxide it is found that its reaction product is gaseous CO, the present invention uses vacuum Method, the CO for generating reaction quickly taken away, leads to the concentration dramatic decrease of reaction product, it is anti-that reduction will be greatly improved in this The speed answered, and ensure that the irreversible of reaction.
2, according to thermodynamic principles, the chemical reaction of carbon reduced oxide needs to be more than that certain reaction temperature just can be into Row must satisfy the Gibbs free energy decline of reaction system, and Gibbs free energy is before a standard atmospheric pressure It puts and carrys out evaluation response maximum system energy.Under vacuum conditions, reaction product CO, which is pumped, is equivalent to reaction system and externally does work, Compared with conventional argon gas protective condition, this will be substantially reduced the reaction temperature of carbon reduced oxide.
3, the temperature of superelevation will lead to diamond graphitization and energy cost and rise, and C-C key is highly stable covalent Key, the constraint that lower temperature cannot allow more carbon atoms to be detached from C-C key become free state carbon atom, furthermore carbon material surface The carbide lamella formed in advance can also hinder carbon atom to spread on the outside of coating, these cause carbon materials and oxide coating it Between reduction and carburizing reagent cannot thoroughly carry out.The present invention is used to mix in the precursor (sol-gel) of oxide coating Miscellaneous sucrose etc. contains carbon macromolecule, cracks remaining carbon as supplementary carbon source using macromolecule under hot conditions, ensure that in situ go back Original-carburizing reagent progress.
4, the viscosity that sol-gel is improved using the addition of macromolecule organic is conducive to increase coating layer thickness, be reduced Or avoid the repeatedly processes such as coating.
5, for unsaturated state, (i.e. the content of cracking residual carbon is lower than reduction-carburizing reagent institute to the macromolecule carbon source adulterated The total amount of the carbon needed), thus in situ in reduction-carbonation reaction carbon concentration in gradient distribution, i.e., closer to carbon The concentration of material surface carbon is higher, the atom (i.e. oxide reduzate) being reduced can to carbon material surface spread and in turn In-situ preparation carbide.
6, the oxide coating of sol-gel method coating is nano particle composition, utilizes heredity principle, in-situ preparation carbon Compound coating is similarly nanostructure.
7, the method for the present invention can effectively solve phase between nanocarbon/metal, carbon/ceramics, carbon/macromolecule and carbon/carbon interface The problem of capacitive difference improves bond strength, thermal conductivity and the wear-resisting property at interface between carbon and multiple material.In addition, should The in-situ nano carbide coating of technique preparation can also effectively improve the antioxygenic property of carbon materials.
Detailed description of the invention
Fig. 1 is the generated in-situ TiC coating of diamond surface prepared by embodiment 1;Wherein: (a) electron scanning Electronic Speculum (SEM) observe TiC coating cladding diamond grind after pattern, (b) and (c) be respectively TiC/ diamond low power and High power high-resolution atomic response.
Fig. 2 is the SEM pattern of SiC coating cladding diamond broken material prepared by embodiment 2.
Fig. 3 is the generated in-situ nanometer Cr of carbon fiber surface prepared by embodiment 33C2Coating;Wherein: (a) carbon fiber surface In-situ preparation nanometer Cr3C2SEM pattern after coating, the SEM photograph of the carbon fiber surface coating after (b) artificially poking.
Specific embodiment
The present invention can prepare in-situ nano carbide coating on the carbon materials surface of various configuration, below by way of implementation The present invention is further described for example.
Embodiment 1:
The coating object selected in the present embodiment is the bortz powder of 25 μm of commercially available partial sizes, the specific steps are as follows:
(1) the present embodiment is with butyl titanate (Ti (OC4H9)4) it is presoma, and use dehydrated alcohol, deionized water, second Acyl acetone, nitric acid (concentration 69wt.%, analyze pure) and PEG-800 as raw material, wherein butyl titanate, dehydrated alcohol, go The volume ratio of ionized water, acetylacetone,2,4-pentanedione and PEG-800 is 1:9:0.7:0.15:0.25;Dehydrated alcohol is first pressed the 1/3 of total dosage It is two parts with 2/3 point;It is with deionized water that 69wt.% nitric acid is dilute by deionized water and 1/3 dehydrated alcohol mixing wiring solution-forming It is interpreted into the dust technology that concentration is 2.5wt.%, then the pH value for adjusting solution with dust technology is made into solution A to 3.0;By the titanium of weighing Sour four butyl esters, acetylacetone,2,4-pentanedione, are slowly added in remaining 2/3 dehydrated alcohol under rapid stirring, are made into B solution;So Afterwards under fast stirring, solution A is slowly dropped into B solution with buret, then instills PEG-800 (polyethylene glycol), stirring is equal The TiO for the homogeneous transparent that concentration is 0.3 mol/L is obtained after even2Colloidal sol;The colloidal sol of acquisition still aging 24 hours stand-by.
(2) diamond of clean surface is poured into the colloidal sol of step (1) acquisition, after mixing evenly, in 360rpm revolving speed Under conditions of centrifugal filtration after five minutes, take out diamond and be placed in 50 DEG C of drying box and be dried, it is small to be dried 48 When.
(3) after the diamond that step (2) obtain being put into cover and closed preferable graphite crucible, it is placed in resistance furnace In, 1 hour is kept the temperature after being warming up to 350 DEG C under atmospheric environment with the rate of 5 DEG C/min, carries out pre-sintering processing;
(4) finally the graphite crucible for filling diamond is put into vacuum drying oven, be evacuated in furnace vacuum degree less than 1 × 10-1After Pa, after being warming up to 1250 DEG C with the rate of 10 DEG C/min and keep the temperature 4 hours, it is furnace-cooled to room temperature under vacuum condition, completes former Position reduction-carburizing reagent, the final diamond for obtaining surface and being coated with in-situ nano TiC coating.
Fig. 1 show the pattern and microstructure of 40~50 μm of diamond surface coating TiC coatings in the present embodiment, The TiC coating tight that diamond surface is about 10nm by thickness, and be tightly combined between diamond and TiC layer and (pass through SEM Pattern is difficult to distinguish diamond initial surface and TiC coating, to the diamond of TiC coating cladding, after grinding known to observation (such as Fig. 1 (a): black portions are conductive preferable TiC coating, and brilliant white part is that the diamond of conductive insulation destroys cleavage Face);50vol.% diamond/6061Al composite material is prepared for using powder metallurgic method, performance test shows in diamond table After the coated carbide coating of face, the bending strength and thermal conductivity of the composite material of preparation have significantly promotion (such as table 1).
Embodiment 2:
The coating object selected in the present embodiment is 40~50 μm of commercially available diamond broken materials, the specific steps are as follows:
(1) the present embodiment with ethyl orthosilicate (TEOS) be presoma, and using nitric acid (concentration 69wt.%, analysis It is pure), deionized water, dehydrated alcohol and sucrose as raw material, the wherein molar ratio of TEOS, deionized water, dehydrated alcohol and sucrose For 1:6:25:0.25;Nitric acid is first diluted to the dust technology that concentration is 2.5wt.% with deionized water, then with dust technology distillation Water pH value is adjusted to 3, then TEOS weighing and ethyl alcohol are add to deionized water, and airtight heating is to 70 DEG C and stirs 24 hours, Then sucrose is added and stops stirring to after being completely dissolved, obtains the SiO that concentration is about the homogeneous transparent of 0.15 mol/L2Colloidal sol Stand 48 hours for use.
(2) diamond of clean surface is poured into the SiO of step (1) acquisition2In colloidal sol, after mixing evenly, in 300rpm After five minutes, taking-up single-crystal diamond, which is placed in 50 DEG C of drying box, to be dried, dry for centrifugal filtration under conditions of revolving speed Processing 48 hours.
(3) after the diamond that step (2) obtain being put into cover and closed preferable graphite crucible, it is placed in resistance furnace In, 1 hour is kept the temperature after being warming up to 350 DEG C under atmospheric environment with the rate of 5 DEG C/min, carries out pre-sintering processing;
(4) finally the graphite crucible for filling single-crystal diamond is put into vacuum drying oven, is evacuated in furnace vacuum degree less than 1 ×10-1After Pa, after being warming up to 1350 DEG C with the rate of 10 DEG C/min and keep the temperature 4 hours, it is furnace-cooled to room temperature under vacuum condition, completes In-situ reducing-carburizing reagent, the final diamond for obtaining surface and being coated with in-situ nano SiC coating.
As shown in Fig. 2, diamond broken material is coated completely by generated in-situ nano SiC coating, and SiC coating uniform, It is fine and close;50vol.% diamond/6061Al composite material is prepared for using powder metallurgic method, performance test shows in coating SiC After coating, the thermal conductivity of composite material is promoted (such as table 1) by a relatively large margin.
1 50vol.% diamond of table/6061Al composite material performance characteristic
Embodiment 3:
The coating object selected in the present embodiment is domestic T300 carbon fiber, the specific steps are as follows:
(1) the present embodiment is with chromic nitrate (Cr (NO3)3·9H2It O) is presoma, and (concentration is using deionized water, ammonium hydroxide 25wt.%), sucrose (analysis pure) and PEG-800 be as raw material, wherein the weight of chromic nitrate, deionized water, sucrose and PEG-800 Amount is than being 1:9:0.5:0.5.Under agitation, first chromic nitrate is dissolved into deionized water, then with deionized water by ammonium hydroxide Concentration adjust to 5wt.%, diluted ammonium hydroxide is slowly dropped in chromium nitrate solution, pH to 3.5 is adjusted, and is kept stirring Form within 0.5 hour the Cr for the transparent and stable that concentration is 0.25 mol/L2O3Colloidal sol, 60 DEG C of water-bath agings 1 are small under conditions of stirring When, stand 48 hours it is stand-by.
(2) carbon fiber is put into vacuum drying oven, is evacuated to 1 × 10-1After Pa or more, it is warming up to 400 DEG C and heat preservation 1 is small When, remove the organic binder of carbon fiber surface.
(3) Cr will be housed2O3The container of colloidal sol is placed in ultrasonic oscillation sink, and then the carbon fiber handled well is soaked Enter into colloidal sol, carbon fiber is pulled out from colloidal sol with the speed of 1.6mm/s after ultrasonic oscillation 5 minutes, it is clean to be placed in drying Net place is dried.
(4) after the carbon fiber that step (3) obtain being put into cover and closed preferable graphite crucible, it is placed in resistance furnace In, 1 hour is kept the temperature after being warming up to 350 DEG C with the rate of 5 DEG C/min, carries out pre-sintering processing;
(5) finally the carbon fiber that step (4) obtain is put into vacuum drying oven, is evacuated in furnace vacuum degree less than 1 × 10- 1After Pa, after being warming up to 1000 DEG C with the rate of 10 DEG C/min and keep the temperature 4 hours, it is furnace-cooled to room temperature under vacuum condition, completes in situ Reduction-carburizing reagent, the final surface that obtains are coated with in-situ nano Cr3C2The carbon fiber of coating.
As shown in figure 3, carbon fiber surface in-situ preparation nanometer Cr3C2After coating, coating is evenly distributed, wraps up tightly;Through After artificially poking, it can be observed that Cr3C2Coating layer thickness is about tens nanometers.

Claims (3)

1. a kind of method that carbon materials surface in situ generates nano-carbide coating, it is characterised in that: this method includes as follows Step:
(1) using the oxide sol or gel of sol-gel method preparation doping, concentration is 0.05~1.5 mol/L;Institute The oxide sol or gel for stating doping are after adding in single oxide sol or gel as the precursor of reducing agent It is formed, the added precursor as reducing agent is sucrose, polyethylene or polyvinyl alcohol;The single oxide sol or Gel, which refers to, has contained only titanium oxide, silica, chromium oxide, vanadium oxide, zirconium oxide, niobium oxide, tantalum oxide, molybdenum oxide, tungsten oxide With the colloidal sol or gel of one or more of rheium oxide ingredient;It is added in the oxide sol or gel of the doping Mole as carbon atom in the precursor of reducing agent is 0.1 to 10 times of oxide molar amount in colloidal sol or gel;
(2) carbon materials removing surface is clean;
(3) surface coating processing:, will be molten using ultrasonic oscillation, lifting, stirring or spraying method according to the difference of coating object Glue or gel are uniformly coated to carbon materials surface;
(4) it is dried: the carbon materials after the coating processing of surface being placed on 10~80 DEG C of drying, are done in clean room Dry processing;
(5) pre-sintering is handled: under the conditions of atmosphere or protective atmosphere, the carbon materials after coating and drying process being put into In resistance furnace, it is warming up to 240-700 DEG C with the rate less than 10 DEG C/min, 20-300 minutes are kept the temperature, in carbon materials surface shape At coating;
(6) operating process of step (3)-step (5) is repeated, until the coating on carbon materials surface reaches required thickness;
(7) in-situ reducing-carburizing reagent: will be pre-sintered that treated that carbon materials are put into vacuum drying oven, be evacuated in furnace true Reciprocal of duty cycle is less than 5 × 10-1After Pa, after being warming up to 1000~1450 DEG C with the rate lower than 20 DEG C/min and keep the temperature 2~48 hours, very It is furnace-cooled to room temperature under empty condition, completes in-situ reducing-carburizing reagent, the nanometer of growth in situ is finally obtained on carbon materials surface Carbide coating;
Reducing agent used in the in-situ reducing-carburizing reagent is carbon, and the source of carbon is to adulterate in colloidal sol or gel Organic matter cracks remaining carbon under the high temperature conditions;
The nano-carbide coating with a thickness of 10~20nm.
2. the method that carbon materials surface in situ according to claim 1 generates nano-carbide coating, it is characterised in that: Carbon materials described in step (2) are one or more of carbon fiber, graphite, diamond and multi-walled carbon nanotube.
3. the method that carbon materials surface in situ according to claim 1 generates nano-carbide coating, it is characterised in that: The group of the nano-carbide coating becomes titanium carbide, silicon carbide, chromium carbide, vanadium carbide, zirconium carbide, niobium carbide, tantalum carbide, carbon Change one or more of molybdenum, tungsten carbide and carbonization rhenium.
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