Tungsten/iridium composite coating layer for carbon material antioxidation and its preparation method

A carbon material and coating technology, which is applied in the field of tungsten/iridium composite coating for anti-oxidation of carbon materials and its preparation, can solve the problems of low anti-oxidation and anti-scouring performance, high cost, non-wetting, etc., and achieve improved anti-burning Corrosion ability, strong anti-oxidation ability, no stress mutation effect

Inactive Publication Date: 2008-11-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
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AI Technical Summary

Problems solved by technology

The advantage of this method is that the iridium coating is uniform, and a dense iridium coating can be obtained by multiple chemical vapor deposition; the disadvantage of this method is that the cost is high, the price of iridium triacetylacetonate is as high as 1100 yuan / gram, and the iridium coating is not wet with carbon. Wet, high temperature treatment produces a lot of cracking, low anti-oxidation and anti-scourability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 prepares tungsten / iridium composite coating on graphite surface

[0023] (1) Treat the graphite at a high temperature of 2000°C to volatilize the low melting point impurities in the graphite and avoid the poisoning of the tungsten target and the iridium target during the coating preparation process;

[0024] (2) Put the tungsten plate and graphite into the vacuum glow discharge device, use the tungsten plate and graphite as the cathode, the outer shell of the vacuum chamber is the common anode, and the distance between the tungsten plate and the graphite is 40 mm;

[0025] (3) Evacuate to the ultimate vacuum, send in argon, ignite the glow, and the alloy element particles of the source tungsten target are sputtered out and deposited on the graphite surface;

[0026] (4) Power off after 10 hours, inflate, and turn on the vacuum discharge device;

[0027] (5) Replace the tungsten plate with the iridium plate, and adjust the distance between the iridium plate...

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Abstract

This invention relates to a type of carbon material wolfram / iridium smear layer used for antioxygen. The feature is wolfram and carbon material contact directly to form intermediate layer, and iridium and wolfram contact directly to form surface layer.

Description

technical field [0001] The invention relates to a tungsten / iridium composite coating and a preparation method thereof, in particular to a tungsten / iridium composite coating for oxidation resistance of carbon materials and a preparation method thereof. Background technique [0002] Carbon materials include graphite single substance materials and carbon / carbon composite materials, which have low density, high specific strength, thermal shock resistance, creep resistance, and strength increases with temperature between 1000 ° C and 2200 ° C. They have been used in strategic missile warheads , spacecraft return capsule, space shuttle wing leading edge and other aerospace vehicles have been applied. However, since carbon materials react with an oxidizing atmosphere above 400°C to generate carbon monoxide or carbon dioxide volatilization, solving the problem of oxidation resistance of carbon materials is a bottleneck for the wide application of carbon materials. At present, a var...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/18C23C14/34C23C14/54B32B5/14
Inventor 陈照峰陶杰徐重
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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