Formation and oxidation resistance of Hf and Al modified silicide coating on Nb-Si based alloy

Formation and oxidation resistance of Hf and Al modified silicide coating on Nb-Si based alloy
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Nb-Si基合金Hf、Al改性硅化物涂层的形成及抗氧化性能

DOI:
10.1016/j.corsci.2014.06.011
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发表时间:
2014-09
期刊:
影响因子:
8.3
通讯作者:
周春根
周春根
中科院分区:
材料科学1区
文献类型:
--
作者:
周春根

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结果表明,该涂层由厚的(Nb, X) si2外层、(Ti, Nb) 5si4中间层和薄的不连续的(Cr, Al)2(Nb, Ti)内层组成。在1250℃等温氧化100 h后,涂层的质量增加仅为4.12 mg/cm2,在氧化垢与涂层的界面处形成了“氧化钉”。该涂层由于改善了氧化皮与涂层之间的附着力而表现出良好的抗循环氧化性。
Codeposition of Si, Al and Hf were prepared by pack cementation at 1300 °C for 10 h. The results show that the coating is composed of a thick (Nb, X)Si2outer layer, a (Ti, Nb)5Si4middle layer and a thin discontinuous (Cr, Al)2(Nb, Ti) inner layer. The mass gain of the coating is only 4.12 mg/cm2after isothermal oxidation at 1250 °C for 100 h. Some “oxide pegs” form at the interface of the oxide scale and coating. The coating exhibits good cyclic oxidation resistance due to the improved adhesion between the oxide scale and coating.
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