Method for preparing tungsten skeleton coating on surface of carbon/carbon composite material through reactive deposition

A technology of carbon composite material and surface reaction, which is applied in the field of preparation of metal tungsten skeleton coating by reaction deposition on the surface of carbon/carbon composite material, can solve the problems such as not suitable for W coating, achieve low cost, and suppress the generation of WC brittle phase , the effect of uniform pore size distribution

Active Publication Date: 2016-11-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are not suitable for the preparation of W coatings. At present, the preparation of W coatings mainly includes chemical vapor deposition, physical vapor deposition, molten salt electroplating, plasma spraying, etc. Document 3 "C/C composite surfac

Method used

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  • Method for preparing tungsten skeleton coating on surface of carbon/carbon composite material through reactive deposition
  • Method for preparing tungsten skeleton coating on surface of carbon/carbon composite material through reactive deposition
  • Method for preparing tungsten skeleton coating on surface of carbon/carbon composite material through reactive deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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 samples, polished with 80-mesh coarse sandpaper to roughen the surface, cleaned and dried;

[0023] 2) Buy Si powder, C powder, Al from the market 2 O 3 Powder as raw material is mixed in a ratio of 5:1:0.5, and then the mixed powder is placed in a ball mixer and stirred for 0.5h as an embedded 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 and keep it at 1900°C for 2 hours under an argon protective atmosphere to obtain a C / C composite sample with a certain thickness of SiC coating. Then use sandpaper to smooth the coating surface, clean and dry;

[0024] 3) Buy W powder, Al from the market 2 O 3 Pink, NH 4 F powder is used as raw material, and tungsten powder and NHF 4 The powder is mixed by mass fraction 80%, 20%, and then the mixed...

Embodiment 2

[0026] 1) According to φ10mm specification, the density will be ρ=1.70g / cm 3 The C / C composite material is processed into samples, polished with 80-mesh coarse sandpaper to roughen the surface, cleaned and dried;

[0027] 2) Buy Si powder, C powder, Al from the market 2 O 3 Powder as raw material is mixed in a ratio of 5:1:0.5, and then the mixed powder is placed in a ball mixer and stirred for 0.5h as an embedded 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 and keep it at 2000°C for 2h under an argon protective atmosphere to obtain a C / C composite sample with a certain thickness of SiC coating. Then use sandpaper to smooth the coating surface, clean and dry;

[0028] 3) Buy W powder, Al from the market 2 O 3 Pink, NH 4 F powder is used as raw material, and tungsten powder and NHF 4 The powder is mixed at 60% and 40% by mass fraction, and then the mixed powde...

Embodiment 3

[0030] 1) According to the φ20×10mm specification, the density will be ρ=1.70g / cm 3 The C / C composite material is processed into samples, polished with 80-mesh coarse sandpaper to roughen the surface, cleaned and dried;

[0031] 2) Buy Si powder, C powder, Al from the market 2 O 3 Powder as raw material is mixed in a ratio of 5:1:0.5, and then the mixed powder is placed in a ball mixer and stirred for 0.5h as an embedded 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 2100°C for 2 hours to obtain a C / C composite sample with a certain thickness of SiC coating. Then use sandpaper to smooth the coating surface, clean and dry;

[0032] 3) Buy W powder, Al from the market 2 O 3 Pink, NH 4 F powder is used as raw material, and tungsten powder and NHF 4 The powder is mixed at 70% and 30% by mass fraction, and then the...

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Abstract

The invention relates to a method for preparing a tungsten skeleton coating on the surface of a carbon/carbon composite material through reactive deposition. According to the method, a SiC transition layer is prepared by adopting an embedding method, so that physical and chemical compatibility between the C/C composite material and W is improved, meanwhile, the interdiffusion between elemental C and elemental W is prevented, and the generation of a WC brittle phase is inhibited. A porous W coating is deposited on the surface of the C/C composite material by using a series of chemical reactions occurring in a closed alumina crucible, is uniform in pore size distribution and is applicable to the infiltration of a second phase at a later stage. The entire coating and a C/C composite material matrix are combined excellently. The surface reaction deposition method for the W coating can be used for achieving the preparation of the thin-wall W skeleton coating, and the disadvantages that the efficiency of vapor deposition is low and plasma spraying cannot be used for preparing coatings on complicated members are overcome. After the W skeleton coating is prepared on the surface of the C/C composite material through reactive deposition, a foundation for preparing tungsten infiltrated copper and tungsten infiltrated silver coatings on surfaces of C/C composite materials is laid.

Description

Technical field [0001] The invention belongs to the field of coating preparation, and specifically relates to a preparation method of a carbon / carbon composite material surface reaction deposition metal tungsten skeleton coating. Background technique [0002] Tungsten (W) is the metal element with the highest melting point. Because of its high strength, high elastic modulus, low thermal expansion coefficient, low tritium retention rate and particle erosion resistance, it has been widely used in harsh environments such as high temperature and high speed particle erosion. For example, in the patent 1 "Advanced Materials and Processes for Boost Phase Nozzles, Robert Hickman, Timothy McKechnie." PPI company uses vacuum plasma spraying process to prepare W-Re and W-Re-HfC net size nozzles, after the solid rocket engine hot test run Assessment (aluminum-containing propellant, working pressure 9MPa, temperature 3000℃, working time> 2.5s), the ablation rate of the throat is zero, indi...

Claims

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Application Information

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IPC IPC(8): C04B41/90
CPCC04B41/009C04B41/52C04B41/90C04B35/83C04B41/5059C04B41/4545C04B41/4554C04B41/5133C04B41/4582
Inventor 郭领军彭坚寇钢霍彩霞李贺军李克智
Owner NORTHWESTERN POLYTECHNICAL UNIV
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