Morphology, structure and formation mechanism of silicide coating by pack cementation process

被引：27
|
作者：
Xiao Lai-rong [1 ]
Cai Zhi-gang [1 ]
Yi Dan-qing [1 ]
Ying Lei [1 ]
Liu Hui-qun [1 ]
Huang Dao-yuan [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2006年 / 16卷
关键词：
niobium based alloy; pack cementation; silicide coating; formative mechanism;
D O I：
10.1016/S1003-6326(06)60182-9
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The MOSi2 coating on C103 niobium based alloy was prepared by pack cementation method. The formative mechanism, morphology and structure of coating were investigated. The silicide coating was formed by reactive diffusion obeying parabolic rule during pack cementation process. It is found that the composite structural coating is composed of three inferior layers as follows. The main layer is composed of MOSi2, the two phases' transitional layer consists of NbSi2 and a few Nb5Si3 and the diffuse layer is composed of Nb5Si3. The dense amorphous glass layer formed on the surface at high temperature oxidation circumstance can effectively prevent the diffusion of oxygen into coating.
引用
收藏
页码：S239 / S244
页数：6
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