The effect of enamel coating on the oxidation behavior of Ti3Al-based intermetallics at 750°C in air

被引：26
作者：
Xiong, Yuming
Zhu, Shenglong
Wang, Fuhui
Lee, Changhee
机构：
[1] Hanyang Univ, Coll Engn, Div Engn & Mat Sci, Neomat Hybrid Proc Lab, Seoul 133791, South Korea
[2] Chinese Acad Sci, Met Res Inst, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 460卷 / 214-219期
基金：
中国国家自然科学基金;
关键词：
enamel coating; Nb effect; oxidation behavior; Ti3Al alloys;
D O I：
10.1016/j.msea.2007.01.058
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The synergistic effects of alloy element Nb and enamel coating on the oxidation behavior of Ti3Al-based alloys in open air at 750 degrees C were studied in the present paper. The results showed that 17Nb alloyed Ti3Al intermetallics showed better oxidation resistance due to the formation of a compact and adhesive TiO2 scale during oxidation. Enamel coating as a barrier could protect Ti3AlNb alloys from oxidation. The coating kept intact and adhesive during discontinuous oxidation due to its good compatibility and matched thermal expansion coefficient with the substrates of Ti-based alloys. Nevertheless, the enamel coating might be degraded due to the rapid formation of Nb enriched sublayer and depletion layer at the interface of enamel/Ti3Al-23Nb and enamel/Ti3Al-27Nb. In addition, there existed detectable internal oxidation beneath the interface of enamel/Ti3Al-xNb (x = 23 and 27 at.%) due to the inward diffusion of oxygen through the imperfect Nb enriched sublayer during discontinuous oxidation. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：214 / 219
页数：6
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