Microstructure and high-temperature oxidation behavior of NiCrB coating by arc spraying - 文章详情页

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摘要：

In　order　to　improve　the　high-temperature　oxidation　and　wear　resistance　of　the　superheat　tubes　in　waste　incinerators,　NiCrB　coatings　were　prepared　on　SA213-T2　steel　surface　by　arc　spraying　using　two　types　of　NiCrB　cored　wires　with　different　boron　contents.　Microstructure,　high-temperature　oxidation　behavior　and　microhardness　of　the　NiCrB　coatings　were　investigated,　and　compared　with　the　commercial　NiCrTi　coating.　The　results　show　that　the　NiCrB　coatings　exhibit　dense　layered　structure　with　low　oxides　and　porosity　about　3%.　The　microhardness　of　the　NiCrB　coatings　is　obviously　higher　than　that　of　the　NiCrTi　coating.　Thermo-gravimetric　analysis　was　used　to　evaluate　the　high-temperature　oxidation　behavior　of　the　Ni-based　coatings　at　800℃　under　cyclic　oxidation　condition.　The　NiCrB　coating　with　lower　boron　content　exhibits　excellent　high-temperature　oxidation　resistance　comparing　to　that　of　the　NiCrTi　coating.　Due　to　the　compact　Cr2O3　film　formed　on　the　coating　surface,　the　penetration　of　oxygen　to　internal　coating　is　inhibited.　©　2017,　Editorial　Office　of　Transactions　of　Materials　and　Heat　Treatment.　All　right　reserved.

关键词：

High-temperature oxidation; Microhardness; NiCrB cored wire; Wire-arc spraying

作者机构：

[ 1 ] [Wang, G.-H.]Beijing Engineering Research Center of Eco-materials and LCA, Beijing, 100124, China
[ 2 ] [Yao, H.-H.]College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Zhou, Z.]College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Wang, Y.-M.]College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Wu, X.]Beijing Engineering Research Center of Eco-materials and LCA, Beijing, 100124, China
[ 6 ] [He, D.-Y.]Beijing Engineering Research Center of Eco-materials and LCA, Beijing, 100124, China
[ 7 ] [He, D.-Y.]College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China

通讯作者信息：

周正
[Zhou, Z.]College of Materials Science and Engineering, Beijing University of TechnologyChina

电子邮件地址：

zhouzhengbjut@bjut.edu.cn

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