Effects of surface modification on isothermal oxidation behavior of HVOF-sprayed NiCrA1Y coatings
<正>NiCrAlY coatings were deposited on Ni-based superalloy by high-velocity oxygen-fuel spraying(HVOF).Surface modification by means of grit-blasted,shot-peened and ground methods was used in order to study the effect of surface conditions on the isothermal oxidation behavior of HVOF-sp...
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Published in | 自然科学进展:英文版 no. 2; pp. 173 - 179 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
2011
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Subjects | |
Online Access | Get full text |
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Summary: | <正>NiCrAlY coatings were deposited on Ni-based superalloy by high-velocity oxygen-fuel spraying(HVOF).Surface modification by means of grit-blasted,shot-peened and ground methods was used in order to study the effect of surface conditions on the isothermal oxidation behavior of HVOF-sprayed NiCrAlY coatings at 1 050℃.The results showed that surface modification had an obvious effect on the isothermal oxidation behavior of the coatings.There was a large decrease in growth rate compared with the as-sprayed coating.The scale formed on the grit-blasted and shot-peened coatings was a mixture of Al2O3 and NiCr2O4,while the oxide formed on the ground coating was composed mainly of Al2O3.After surface modification,the content of NiCr2O4 spinels decreased compared with the as-sprayed coating. |
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Bibliography: | Li-yong NI,Zi-long WU,Chun-gen ZHOU Key Laboratory of Aerospace Materials and Performance(Ministry of Education), Department of Materials Science and Engineering,Beihang University,Beijing 100191,China 11-3853/N |
ISSN: | 1002-0071 |