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

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...

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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