A preliminary study of DC magnetron sputtered NiAl-Hf coatings

被引:20
作者
Ning, B [1 ]
Weaver, ML [1 ]
机构
[1] Univ Alabama, Dept Met & Mat Engn, Tuscaloosa, AL 35487 USA
基金
美国国家科学基金会;
关键词
magnetron sputtering; amickel aluminide; bond coat; oxidation;
D O I
10.1016/j.surfcoat.2003.08.071
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Crystalline NiAl-0.1 Hf coatings, similar to20-mum thick, were deposited onto CMSX-4((R)) substrates using direct current (DC) magnetron sputtering. The as-deposited coatings were found to be single phase, consisting of beta-NiAl (B2 structure). Annealing in argon at 1000 degreesC for 1 h resulted in densification of the coatings and in increased adhesion between the coatings and the substrate. Microstructural and compositional changes of the coating system after isothermal oxidation were studied using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques. The mechanical properties of the coatings were studied via nanoindentation in the as-deposited condition, after annealing, and following various oxidation heat treatments. The hardness and modulus of the coatings were observed to correlate with oxidation time. Extended oxidation resulted in decreased hardness due to grain growth, precipitate coarsening and the diffusion of solutes into and out of the coating. The results are discussed relative to conventional CVD aluminide coatings. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:113 / 120
页数:8
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