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Preparation method of carbon/carbon composite material surface reaction deposition metal tungsten skeleton coating

A carbon composite material and surface reaction technology, which is applied in the preparation field of carbon/carbon composite material surface reaction deposition metal tungsten skeleton coating, can solve the problems such as not suitable for W coating, achieve low cost, uniform pore size distribution, and good bonding Effect

Active Publication Date: 2018-12-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 surface tungsten coating Combination performance improvement" using plasma spraying and physical vapor deposition to prepare W coatings on C / C composites
However, there is no literature on the preparation of porous W-skeleton coatings on C / C composites using the above method.

Method used

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  • Preparation method of carbon/carbon composite material surface reaction deposition metal tungsten skeleton coating
  • Preparation method of carbon/carbon composite material surface reaction deposition metal tungsten skeleton coating
  • Preparation method of carbon/carbon composite material surface reaction deposition metal tungsten skeleton coating

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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 a sample, polished with 80-grit sandpaper to roughen the surface, cleaned and dried;

[0023] 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 and keep it at 1900°C for 2 hours under an argon protective atmosphere to obtain a C / C composite material sample with a certain thickness of SiC coating. Then use sandpaper to smooth the surface of the coating, clean and dry;

[0024] 3) Buy W powder from the market, Al 2 o 3 Powder, NH 4 F powder is used as raw material, first mix tungsten powder and NHF 4 powder according to the mass fraction of 8...

Embodiment 2

[0026] 1) According to the specification of φ10mm, 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;

[0027] 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 and keep it warm at 2000°C for 2 hours under an argon protective atmosphere to obtain a C / C composite material sample with a certain thickness of SiC coating. Then use sandpaper to smooth the surface of the coating, clean and dry;

[0028] 3) Buy W powder from the market, Al 2 o 3 Powder, NH 4 F powder is used as raw material, first mix tungsten powder and NHF 4 Powder is mixed according to mass fraction...

Embodiment 3

[0030] 1) According to the specification of φ20×10mm, 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;

[0031] 2) Buy Si powder, C powder, Al from the market 2 o 3Mix 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 2100°C for 2 hours to obtain a C / C composite material sample with a certain thickness of SiC coating. Then use sandpaper to smooth the surface of the coating, clean and dry;

[0032] 3) Buy W powder from the market, Al 2 o 3 Powder, NH 4 F powder is used as raw material, first mix tungsten powder and NHF 4 powder according to the mass fraction of 70%...

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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 in particular 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 Patent 1 "Advanced Materials and Processes for Boost Phase Nozzles, Robert Hickman, Timothy McKechnie.", PPI Company used the vacuum plasma spraying process to prepare W-Re and W-Re-HfC net size nozzles, which were thermally tested by solid rocket motors. Examination (aluminum-containing propellant, working pressure 9MPa, temperature 3000°C, working time > 2.5s), the throat ablation rate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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