期刊
VACUUM
卷 164, 期 -, 页码 286-292出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2019.03.037
关键词
Silicide coating; Vacuum sintering; High temperature oxidation; Spark plasma sintering
资金
- National Natural Science Foundation of China [51601219]
- Natural Science Foundation of Jiangsu Province, China [BK20160261]
- China Postdoctoral Science Foundation [2018M630624]
In order to develop the oxidation-resistant coatings for Nb based alloy at high temperatures, multi-component silicide coatings, Si-Cr-Ti coatings with and without Mo or W addition, were fabricated by spark plasma sintering process. The sintered Si-Cr-Ti coating mainly consists of single NbSi2 phase with solid solution of Ti and Cr (i.e. (Nb,Ti,Cr)Si-2), while MoSi2 or WSi2 are also found in the coatings with addition of Mo or W respectively. The oxidation resistance of the coatings was tested in air at 1450 degrees C for 24 h. The (Nb,Ti,Cr)Si-2 coating shows insufficient protection and the formed complex oxides scale turns to powders. With adding Mo or W in the coatings, dense oxide scales are formed, and the W-added coating exhibits better oxidation resistance due to the formation of a more continuous and thinner SiO2 layer.
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