Oxidation behavior and microstructural evolution of a slurry sintered Si-Mo coating on Mo alloy at 1650 °C

被引：64
作者：
Cai, Zhenyang [1 ,2 ]
Liu, Sainan [1 ,2 ]
Xiao, Lairong [1 ,2 ]
Fang, Zheng [1 ]
Li, Wei [1 ]
Zhang, Bei [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Minist Educ, Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2017年 / 324卷
基金：
中国国家自然科学基金;
关键词：
Molybdenum alloy; MoSi2; coating; Slurry technique; Oxidation behavior; HIGH-TEMPERATURE OXIDATION; MOLYBDENUM DISILICIDE; MECHANICAL-PROPERTIES; RESISTANT COATINGS; MOSI2; SUBSTRATE; COMPOSITE; PROTECTION; AIR;
D O I：
10.1016/j.surfcoat.2017.05.054
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A high-temperature oxidation-protective Si-Mo coating on a molybdenum alloy substrate was prepared by slurry sintering method. The structure, composition, phase distribution, and oxidation behavior of the coating were studied. The results show that the coating has a double-layer microstructure with an outer MoSi2 layer and an inner Mo5Si3 layer. After oxidation, the coating is composed of a SiO2 outer layer, a MoSi2 middle layer, and a Mo5Si3 inner layer. The mechanism of the phase distribution and the oxidation kinetic equation were also studied. The oxidation rate K-p determined over 12 hat 1650 degrees C, was found to be 0.061 mg(2) cm(-4) h(-1). The excellent oxidation protective ability of the coating at ultra-high temperatures is attributable to the formation of self healing SiO2 on the coating surface after the oxidation of MoSi2. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：182 / 189
页数：8
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