Microstructure and oxidation behaviour of Fe-Cr-silicide coating on a niobium alloy

被引：12
作者：
Alam, Md. Z. [1 ]
Sarin, S. [1 ,2 ]
Kumawat, M. K. [1 ]
Das, D. K. [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
[2] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2016年 / 32卷 / 18期
关键词：
Silicide coating; Niobium alloy; Oxidation; IN-SITU COMPOSITES; PROTECTIVE-COATINGS; MOLTEN-SALT; TEMPERATURES; METALS;
D O I：
10.1080/02670836.2016.1148226
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The cyclic oxidation performance of a Fe-Cr-modified silicide coating on Nb-alloy C-103 was evaluated in air at temperatures between 1100 and 1500 degrees C and the microstructural changes examined. The coating was oxidation resistant and the duration of protection increased from 60 minutes at 1100 degrees C to 255 minutes at 1500 degrees C. The formation of the surface glassy silica layer and its ability to heal the cracks in the coating enhanced the oxidation performance at high temperatures. The outer NbSi2 layer served as a reservoir of Si and sustained the formation of the protective silica scale. Spallation of the silica scale and the concomitant depletion of the NbSi2 layer towards the regeneration of the silica scale limit the oxidation life of the coating.
引用
收藏
页码：1826 / 1837
页数：12
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