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

页码：182 / 189

页数：8

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