Characterization and oxidation resistance of B-modified Mo3Si coating on Mo substrate

被引：11
作者：
Deng, Xinke [1 ]
Zhang, Guojun [1 ]
Wang, Tao [1 ]
Ren, Shuai [1 ]
Li, Zhibo [1 ]
Song, Peng [1 ]
Shi, Yao [1 ]
机构：
[1] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Shaanxi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 807卷
基金：
中国国家自然科学基金;
关键词：
PTA process; B-modified Mo3Si coating; Refractory metals; Oxidation resistance; MECHANICAL-PROPERTIES; WEAR-RESISTANCE; MICROSTRUCTURE; ALLOYS; BORON; BEHAVIOR; TZM;
D O I：
10.1016/j.jallcom.2019.151693
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A B-modified Mo3Si coating was fabricated on a pure Mo substrate by the plasma transferred arc (PTA) cladding process. The microstructure, phase constitution, and oxidation resistance of the coating were studied to determine the effect of B addition. The microstructure characterization shows that the coarse Mo3Si dendrites and few small dispersed Mo5Si3 particles are uniformly distributed in the Mo3Si/ Mo5SiB2 eutectics matrix. Compared to both the pure Mo and Mo3Si reference materials, the B-modified Mo3Si coating exhibits a drastic improvement in oxidation resistance, which can be ascribed to a complete surface coverage by a borosilicate glass scale produced during the high temperature oxidation exposure to air at 1300 degrees C. Upon oxidation small additions of B into Mo3Si compound promotes the rapid formation of a dense and continuous borosilicate glass scale and improves its viscous flow on the coating surface, restricting the inward oxygen diffusion to the oxidation interface, and thereby enhancing its oxidation resistance. (C) 2019 Elsevier B.V. All rights reserved.
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页数：9
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