High-Temperature Oxidation Behavior of a Single-Layer IrAl Intermetallic Coating

被引：2
|
作者：
Zhu, Li'an [1 ]
Ye, Yicong [1 ]
Bai, Shuxin [1 ]
Zhang, Hong [1 ]
Zhang, Kaili [1 ]
Ai, Yuanlin [1 ]
Li, Shun [1 ]
Tang, Yu [1 ]
机构：
[1] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Dept Mat Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
OXIDATION OF METALS | 2019年 / 91卷 / 5-6期
基金：
中国国家自然科学基金;
关键词：
Iridium aluminide; Pack cementation; Intermetallics; Cyclic oxidation; IRIDIUM-ALUMINUM;
D O I：
10.1007/s11085-019-09907-z
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In order to improve the high-temperature service property of Ir, a well-bonded single-layer pure IrAl intermetallic coating was prepared on Ir by pack cementation followed by vacuum annealing treatment. The oxidation behavior of the IrAl coating was investigated by cyclic oxidation tests at 1400-2000 degrees C and compared with that of pure Ir. The results showed that the IrAl coating, although containing many cracks, exhibited excellent oxidation resistance over the whole experimental temperature range. The reasons were deduced to be the in situ formation of Al2O3 and the sintering of the cracks in the IrAl layer. The excellent oxidation protective effect of the single-layer IrAl coating can be ascribed to its stable and unique as-oxidized microstructure, i.e., double-layer structure of Al2O3/Ir, which showed excellent compatibility and comprehensive property.
引用
收藏
页码：749 / 766
页数：18
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