| Formation mechanism of laser-clad gradient thermal barrier coatings |
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| 作者姓名： | 陈国锋 冯钟潮 梁勇 |
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| 作者单位： | CHEN Guo feng，FENG Zhong chao，LIANG Yong Institute of Metals Research，Chinese Academy of Sciences，Shenyang 110015，P.R.China |
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| 摘 要： | 1 ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＺｒＯ2 ｃｅｒａｍｉｃｓｗａｓｓｅｌｅｃｔｅｄａｓｔｈｅｍａｔｅｒｉａｌｏｆｔｈｅｒｍａｌｂａｒｒｉｅｒｃｏａｔｉｎｇｓ (ＴＢＣｓ)ｆｏｒｉｔｓｈｉｇｈｍｅｌｔ ｉｎｇ ｐｏｉｎｔａｎｄｈｉｇｈｅｘｐａｎｓｉｏｎｃｏｅｆｆｉｃｉｅｎｔ1].ＴｈｅｍｅｔｈｏｄｔｏｐｒｏｄｕｃｅＴＢＣｓｗａｓｕｓｕａｌｌｙｐｌａｓｍａｓｐｒａｙｉｎｇｔｅｃｈｎｉｑｕｅ.Ｔｈｅｐｏｒｏｓｉｔｙｉｎｔｈｅｃｏａｔｉｎｇａｎｄｔｈｅｐｏｏｒａｄｈｅｒｅｎｃｅｂｅｔｗｅｅｎｃｏａｔｉｎｇａｎｄｓ…
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Formation mechanism of laser-clad gradient thermal barrier coatings |
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| CHEN Guo-feng,FENG Zhong-chao,LIANG Yong.Formation mechanism of laser-clad gradient thermal barrier coatings[J].Transactions of Nonferrous Metals Society of China,2000,10(1). |
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| Authors: | CHEN Guo-feng FENG Zhong-chao LIANG Yong |
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| Abstract: | The stratified gradient thermal barrier coatings (TBCs) were obtained by laser cladding of ZrO 2 and NiCoCrAlY mixture powder. The coatings were four layer structure: cellular dendritic ZrO 2, dense ZrO 2, Ni based alloy bonding coating and substrate. The formation of the stratified TBCs was attributed to the insolubility of ZrO 2 in the Ni based alloy and the lower density of ZrO 2 than that of Ni based alloy when both of them were in melted condition. The formation of two layered ZrO 2 was related to the presence of Al in the Ni based alloy, i) Al could be preoxidized into Al 2O 3 that could be segregated in the grain boundaries of ZrO 2 during solidification process; ii) Al could be partially preoxidized into Al 2O 3, then Al and Al 2O 3 could be segregated simultaneously at the grain boundaries of ZrO 2 during solidification process. Two formation processes were presented. |
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| Keywords: | laser cladding thermal barrier coatings formation mechanisms |
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