|Table of Contents|

Failure behavior analysis of silicide coating on Nb-Hf alloy at surface high temperature(PDF)

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

Issue:
2019年02期
Page:
66-73
Research Field:
工艺与材料
Publishing date:

Info

Title:
Failure behavior analysis of silicide coating on Nb-Hf alloy at surface high temperature
Author(s):
PAN Zhaoyi; ZHAO Qingrui;  WANG Guoqiang;  CAI Gang;  SONG Guoxin
(Xi'an Space Engine Company Limited, Xi'an 710100, China)
Keywords:
Nb-Hf alloy;  Silicide coating;  instantaneous high temperature;  oxidation behavior
PACS:
V252
DOI:
-
Abstract:
Nb-Hf alloy is the main structured material of the trust chamber in orbit-attitude controlled liquid rocket engine.The Nb-Hf alloy is easily oxidized in high temperature and aerobic working environment, so it is necessary to coat the alloy surface with high temperature oxidation resistant.In this paper, the oxidation failure behavior of silicide coating on Nb-Hf alloy surface at high temperature is expounded by analyzing its high temperature oxidation, high temperature thermal shock, instantaneous high temperature ablation and hot test behavior.The test results are as follows: under the oxidation conditions below 1 800℃, a dense SiO2 film is formed on the surface of the coating, so that the oxidation life of the coating is longer than 2 h; Under the ultra-high temperature oxidation condition above 1 800℃, a large amount of ablative grid structures are formed inside the coating due to high temperature thermal shock, and no silica oxide film is formed on the surface and the oxidation life is less than 10 s.In the hot test, the oxidation resistance of the coating is better when the outer wall temperature of the thrust chamber is below 1 350℃, while the oxidation resistance of the coating decreases rapidly with the increase of the coating temperature.

References:

[1] 张绪虎,汪翔,贾中华,等.小推力姿/轨控液体火箭发动机材料的研究进展[J].宇航材料工艺,2005(5):11-15.
[2] 肖来荣,许谅亮,易丹青.铌合金表面硅化物涂层热震行为研究[J].稀有金属,2008,32(3):257-262.
[3] 孙佳,王玉,付前刚.铌合金高温热防护及其抗氧化硅化物涂层[J].中国材料进展,2018,37(10):817-825.
[4] FEI X A, NIU Y R.Oxidation behavior of Al2O3 reinforced MoSi2 composite coatings fabricated by vacuum plasma spraying[J]. Ceramics International, 2010, 36(4):2235-2239.
[5] CABOURO G, GALLET S, CHEVALIER S, et al.Dense MoSi(2)produced by reactive flash sintering: Control of Mo/Si agglomerates prepared by high-energy ball milling[J].Powder Technology, 2011, 208(S2): 526-531.
[6] 田进鹏,周小军,赵刚.航天发动机用铌钨合金高温抗氧化复合涂层的制备研究[J].稀有金属与硬质合金, 2016,44(2):18-22.
[7] 潘兆义,蔡刚,马双民,等.硅化物涂层对铌钨合金的热防护行为研究[J].火箭推进,2015,41(3):59-65. PAN Zhaoyi, CAI Gang, MA Shuangmin.Research of thermal protection behavior for silicide coatings on Nb-W alloys used at high temperature[J].Journal of Rocket Propulsion, 2015, 41(3): 59-65.
[8] 潘兆义,蔡刚,宋国新.铌铪合金推力室身部表面高温防护涂层的工艺技术研究[J].火箭推进,2016,42(4):68-73. PAN Zhaoyi, CAI Gang, SONG Guoxin.Research of thermal protection silicide coatings on Nb-Hf alloys used as attitude control engine thrust chamber[J].Journal of Rocket Propulsion, 2016, 42(4):68-73.
[9] 张松,郭喜平.Hf含量对Nb-Si基超高温合金组织的影响[J].稀有金属材料与工程,2015,44(9):2182-2188.
[10] WU W P, ZHAO F C.Growth mechanism of polycrystalline Ir coating by double glow plasma technology[J].Acta Metallurgica Sinica(English Letters), 2012, 25(6): 469-479.
[11] 王 堃,王国强.双组元推力室热防护涂层工艺技术研究[J].火箭推进,2018,44(2):76-81. WANG Kun, WANG Guoqiang.Research on thermal protection coating technique of bipropellant thrust chamber[J].Journal of Rocket Propulsion, 2018, 44(2):76-81.
[12] QIAN J G, XIAO S M, ZHAO T.Effect of technical parameters on surface morphology of electro deposition of Iridium layer in aqueous system[J].Rare Metal Materials and Engineering, 2012, 41(7): 1139-1143.

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Last Update: 2019-04-30