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A kind of preparation method of metal tungsten gradient coating on the surface of carbon/carbon composite material

A technology of carbon composite materials and surface metal, which is applied in the field of preparation of metal tungsten gradient coatings on the surface of carbon/carbon composite materials, can solve the problems of increasing process complexity and cost, and achieve improved spraying effect, compact structure, and prevention of WC The effect of brittle phase formation

Active Publication Date: 2017-08-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the complexity of the process and greatly increases the cost
Therefore, there are still many difficulties in preparing W coatings on the surface of C / C composites.

Method used

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  • A kind of preparation method of metal tungsten gradient coating on the surface of carbon/carbon composite material
  • A kind of preparation method of metal tungsten gradient coating on the surface of carbon/carbon composite material
  • A kind of preparation method of metal tungsten gradient coating on the surface of carbon/carbon composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) According to the specification of 10×10×10mm, the density is ρ=1.70g / cm 3 The C / C composite material is processed into a sample, polished with 80-grit sandpaper to roughen the surface, cleaned and dried;

[0030] 2) Buy Si powder, C powder, Al from the market 2 o 3 Mix powder as raw material in a ratio of 6:1:0.8, and then put the mixed powder in a ball mixer and stir for 0.5h, as embedding powder. Put the C / C sample obtained in step 1 into a graphite crucible, and bury the above powder. Put the crucible into a high-temperature vacuum graphitization furnace under an argon protective atmosphere, and keep it at 1800°C for 2 hours to obtain a C / C composite material sample with a certain thickness of SiC / Si coating. Then use sandpaper to smooth the surface of the coating, clean and dry;

[0031] 3) Mix Si powder, W powder, and C powder purchased from the market in a ratio of 6:6:1, and then put the mixed powder in a ball mixer and stir for 0.5h as embedding powder. ...

Embodiment 2

[0036] 1) According to the specification of φ30×10mm, the density is ρ=1.70g / cm 3 The C / C composite material is processed into a sample, polished with 80-grit sandpaper to roughen the surface, cleaned and dried;

[0037] 2) Buy Si powder, C powder, Al from the market 2 o 3 Mix the powder as raw material in a ratio of 5:1:0.5, and then put the mixed powder in a ball mixer and stir for 0.5h as the embedding powder. Put the C / C sample obtained in step 1 into a graphite crucible, and bury the above powder. Put the crucible into a high-temperature vacuum graphitization furnace under an argon protective atmosphere, and keep it at 1800°C for 2 hours to obtain a C / C composite material sample with a certain thickness of SiC / Si coating. Then use sandpaper to smooth the surface of the coating, clean and dry;

[0038] 3) Mix Si powder, W powder, and C powder purchased from the market in a ratio of 6:6:1, and then put the mixed powder in a ball mixer and stir for 0.5h as embedding powd...

Embodiment 3

[0043] 1) According to the specification of 10×10×10mm, the density is ρ=1.70g / cm 3 The C / C composite material is processed into a sample, polished with 80-grit sandpaper to roughen the surface, cleaned and dried;

[0044] 2) Buy Si powder, C powder, Al from the market 2 o 3 Mix the powder as raw material in a ratio of 5:1:0.5, and then put the mixed powder in a ball mixer and stir for 0.5h as the embedding powder. Put the C / C sample obtained in step 1 into a graphite crucible, and bury the above powder. Put the crucible into a high-temperature vacuum graphitization furnace under an argon protective atmosphere, and keep it at 2000°C for 2 hours to obtain a C / C composite material sample with a certain thickness of SiC / Si coating. Then use sandpaper to smooth the surface of the coating, clean and dry;

[0045] 3) Mix Si powder, W powder, and C powder purchased from the market in a ratio of 6:5:1, and then put the mixed powder in a ball mixer and stir for 0.5h to serve as emb...

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Abstract

The invention relates to a preparation method of a carbon / carbon composite material surface metal tungsten gradient coating, which aims to solve the problems of poor compatibility between the C / C composite material and W, high tendency to generating the WC brittle phase and the like. The method comprises the following steps: previously preparing a SiC / WSi2 transition layer on the C / C composite material surface by a two-step embedding process to improve the physicochemical compatibility between the C / C composite material and metal W; and finally, successfully preparing a W coating on the C / C composite material surface coated with the SiC / WSi2 transition layer by an ultrasonic plasma spraying process, thereby preparing the C-Si-W gradient coating on the C / C composite material surface. The SiC / WSi2 transition layer and sprayed W overcoating have compact structure, and are firmly combined with the base. The C / C composite material with the C-Si-W gradient coating maintains the advantages of high strength, low specific gravity and the like, and also has excellent properties of the metal W.

Description

technical field [0001] The invention belongs to the field of carbon / carbon composite material coating preparation, and in particular relates to a preparation method of a metal tungsten gradient coating on the surface of a carbon / carbon composite material. Background technique [0002] Carbon / carbon (C / C) composites have a series of excellent properties unmatched by other materials, such as low density, high specific strength, large specific modulus, ablation resistance, friction resistance, thermal shock resistance, high damage tolerance, With unique high-temperature mechanical strength retention and good designability, C / C composites show great application prospects whether they are used in aerospace, nuclear, biomedical, and automotive electronics. However, due to the unique preparation process of C / C composite materials and the limitations of the structure and performance of carbon materials, C / C composite materials have some shortcomings that cannot be overcome by themse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/88
Inventor 郭领军彭坚李贺军李克智付前刚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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