Formation and oxidation resistance of germanium modified silicide coating on Nb based in situ composites

Formation and oxidation resistance of germanium modified silicide coating on Nb based in situ composites
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铌基原位复合材料上锗改性硅化物涂层的形成及其抗氧化性能

DOI:
10.1016/j.corsci.2013.11.029
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发表时间:
2014-03
期刊:
影响因子:
8.3
通讯作者:
Chungen Zhou
Chungen Zhou
中科院分区:
材料科学1区
文献类型:
--
作者:
Wan Wang;Bifei Yuan;Chungen Zhou

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采用Si-Ge共沉积法,在Nb-Si基合金上于1300 °C下沉积10 h,制备了Ge改性的硅化物涂层。共沉积用包粉由16 Si-8 Ge-5 NaF-71 Al 2 O3(重量%)组成。观察到涂层由外层和过渡层组成。在1250 °C氧化100 h后,衬底和Ge改性硅化物涂层的质量增益分别为190.08和5.42 mg cm-2。该涂层能有效地防止基体氧化。良好的抗氧化性归因于玻璃态GeO 2和SiO2的形成。
Ge-modified silicide coating was prepared on the Nb–Si based alloy by Si–Ge co-deposition at 1300 °C for 10 h. The pack powder for co-deposition consisted of 16Si–8Ge–5NaF–71Al2O3(wt.%). It is observed that the coating is composed of an outer layer and a transitional layer. The mass gain of substrate and Ge-modified silicide coating are 190.08 and 5.42 mg cm−2after oxidation at 1250 °C for 100 h, respectively. The coating can prevent substrate from oxidizing efficiently. The good oxidation resistance is attributed to the formation of glassy GeO2and SiO2.
DOI: --
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