Influence of water vapor on the isothermal oxidation behavior of low pressure plasma sprayed NiCrAlY coating at high temperature

Influence of water vapor on the isothermal oxidation behavior of low pressure plasma sprayed NiCrAlY coating at high temperature
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水蒸气对低压等离子喷涂NiCrAlY涂层高温等温氧化行为的影响

DOI:
10.1016/s0257-8972(02)00398-5
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发表时间:
2002-11
影响因子:
5.4
通讯作者:
Jingsheng Yu
Jingsheng Yu
中科院分区:
材料科学1区
文献类型:
--
作者:
Chungen Zhou;Jingsheng Yu

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研究了镍基高温合金低压等离子喷涂NiCrAlY涂层在1050 °C、O2、O2和5%H2O混合气体中的氧化行为。NiCrAlY涂层在1050 °C纯O2中的氧化速率很低,氧化动力学符合抛物线规律。NiCrAlY涂层在5%水蒸气中长时间暴露后的氧化动力学几乎服从线性规律。LPPS NiCrAlY涂层在1050 °C纯O2中氧化后表面生成的氧化物主要由Al2O3组成,而在O2和5%H2O混合气体中氧化后表面生成的氧化物主要由NiCr2O4、NiO、Cr2O3和Al2O3组成。结果表明,水蒸气对NiCrAlY涂层氧化的影响可能是由于增加了Ni和Cr离子的迁移。
The oxidation of low pressure plasma sprayed (LPPS) NiCrAlY coatings on nickel base superalloy were studied at 1050 °C in flows of O2, and mixture of O2and 5% H2O under atmospheric pressure. NiCrAlY coating exhibits a very low oxidation rate at 1050 °C in pure O2and the oxidation kinetics accords with a parabolic law. The oxidation kinetics of NiCrAlY coating obeys almost a linear law after long exposure times in the presence of 5% water vapor. The oxide formed on the surface of LPPS NiCrAlY coating after oxidation at 1050 °C in pure O2consisted of Al2O3, whereas the oxide formed on the surface of LPPS NiCrAlY coating after oxidation at 1050 °C in a mixture of O2and 5% H2O is mainly composed of NiCr2O4, NiO, Cr2O3and Al2O3. It is suggested that the effect of water vapor on the oxidation of the NiCrAlY coating may be attributed to the increase in Ni and Cr ions transport.
DOI: 10.1016/0921-5093(89)90411-5
发表时间: 1989-02
影响因子: 6.4
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