MoSi2 oxidation resistance coatings for Mo5Si3/MoSi2 composites

被引：19

作者：

Yan Jianhui ^{[1
]}

Xu Hongmei ^{[1
]}

Zhang Houan ^{[1
]}

Tang Siwen ^{[1
]}

机构：

[1] Hunan Univ Sci & Technol, Adv Mat Synth & Applicat Technol Lab, Xiangtan 411201, Peoples R China

来源：

RARE METALS | 2009年 / 28卷 / 04期

关键词：

oxidation resistance; coatings; composites; molybdenum disilicide; MOLYBDENUM DISILICIDE COMPOSITES; COMBUSTION SYNTHESIS; MATRIX COMPOSITES; SILICIDES; BEHAVIOR; CREEP;

D O I：

10.1007/s12598-009-0081-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to improve the oxidation resistance properties of 30 at.% Mo5Si3/MoSi2 composite at high temperature in air, a molybdenum disilicide coating was prepared on its surface by a molten salt technology. XRD and SEM analysis showed that only tetragonal MoSi2 phase existed in the coating after being siliconized for 5 h at 900A degrees C. The oxidation film formed on the uncoated sample was not dense, so that oxygen diffused easily through it. The volatilization of MoO3 resulted in the oxidation film separating from the substrate. The MoSi2 coating was proved to be an effective method to prevent 30 at.% Mo5Si3/MoSi2 composites from being oxidized at 1200A degrees C. A dense glassy SiO2 film was formed on the MoSi2 coating surface, which acted as a barrier layer for the diffusion of oxygen atoms to the substrate. The 30at.% Mo5Si3/MoSi2 composites with a MoSi2 coating showed much better oxidation resistance at high temperature.

引用

页码：418 / 422

页数：5

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