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Research on thermal protection behavior of silicide coating on Nb-W alloys used at high temperature(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2015年03期
Page:
59-65
Research Field:
工艺与材料
Publishing date:

Info

Title:
Research on thermal protection behavior of silicide coating on Nb-W alloys used at high temperature
Author(s):
PAN Zhao-yi;  CAI Gang;  MA Shuang-min;  SONG Guo-xin
Xi’an Space Engine Factory, Xi’an 710100, China
Keywords:
Nb-W alloy;  silicide coating;  thermal protection behavior;  mechanism analysis
PACS:
V252-34
DOI:
-
Abstract:
The Nb-W alloy is an important structured material used for thrust chamber of orbit-attitude control liquid rocket engine. However, it is easy to be oxidized terribly in the oxygen environment, so the anti-oxidation coating must be used to overcome its weakness. Therefore, with method of spraying and vacuum sintering, a silicide coating was prepared on Nb-W alloy to make thermal protection at high temperature. In this paper, the formation of silicide coating, oxidation resistance, thermal shock resistance and anti-ablation were studied to make sure the properties and failure mechanism of silicide coating. The test results indicate that the oxidation time of coating is 11±0.78 h at 1700℃ and 5±0.46 h at 1 800℃; the thermal shocking cycles are 124±9 at 1 600 ℃ to ambient temperature in water; and the thermal shocking cycles are 3410±124 at 1 600～800 ℃ in air. The study results show that the alloy, which have important influence on the research of the new anti-oxidation coatings.

References:

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Last Update: 1900-01-01