Oxidation resistance of γ-TiAl based alloy Ti-45Al-8Nb coated with intermetallic Ti-Al-Cr-Y layers and EB-PVD zirconia topcoats at 950 °C in air

被引：42
作者：
Braun, Reinhold [1 ]
Kelm, Klemens [1 ]
Froehlich, Maik [2 ]
Leyens, Christoph [1 ,3 ]
机构：
[1] DLR German Aerosp Ctr, Inst Mat Res, D-51170 Cologne, Germany
[2] Univ Kiel, Inst Expt & Appl Phys, D-24098 Kiel, Germany
[3] Tech Univ Dresden, Inst Mat Sci, D-01062 Dresden, Germany
来源：
SURFACE & COATINGS TECHNOLOGY | 2013年 / 222卷
关键词：
Titanium aluminides; Intermetallic coatings; Thermal barrier coatings; Oxidation resistance; Oxide scale; THERMAL BARRIER COATINGS; ALUMINA SCALE FORMATION; HIGH-TEMPERATURE APPLICATIONS; TITANIUM ALUMINIDES; ENVIRONMENTAL-PROTECTION; ISOTHERMAL OXIDATION; BEHAVIOR; SYSTEMS; 900-DEGREES-C; IMPROVEMENT;
D O I：
10.1016/j.surfcoat.2013.02.014
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Samples of a high niobium bearing gamma-TiAl based alloy were coated with intermetallic Ti-52Al-15Cr-0.4Y (in at.%) layers produced by magnetron sputtering. On some of the specimens thermal barrier coatings of 7 wt.% yttria partially stabilised zirconia were deposited using electron-beam physical vapour deposition. The oxidation behaviour of the coated Ti-45Al-8Nb (at.%) alloy with and without thermal protection was investigated at 950 C under cyclic oxidation conditions in air. The 20 pm thick Ti-Al-Cr-Y layer exhibited excellent oxidation resistance at this exposure temperature associated with the formation of a thin continuous alumina scale. Lifetimes exceeding 1000 cycles of 1 h dwell time at 950 degrees C were determined for the TBC system consisting of zirconia topcoat and Ti-Al-Cr-Y bond coat. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：128 / 134
页数：7
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