等离子-激光复合制备-NiCrAlY-Al_2O_3层的抗氧化性研究  

Study on Oxidation Resistance of NiCrAlY-Al_2O_3 Coatings Obtained by Plasma-laser Technology

作　　者：武颖娜[1] 张罡[1] 冯钟潮[1] 梁勇[1] 张炳春[1] 巴瑞璋 段爱琴[2] 刘方军[2] 

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]北京航空工艺研究所高能束流加工技术重点实验室,北京100024

出　　处：《金属热处理》2002年第4期8-12,共5页Heat Treatment of Metals

摘　　要：研究了等离子 激光 (plasmasprayingandlaserremelting ,PS&LR)复合制备NiCrAlY Al2 O3 层的抗氧化性能。Al2 O3 的加入量为 (质量分数 ,% ) 10～ 30 ,粒度分 5 0～ 75 μm和 0 31μm两种。 10 0 0℃、10 5 0℃下的等温氧化结果表明 ,PS&LR法制备的涂层氧化速率仅为等离子喷涂层的 1/ 2 ,NiCrAlY Al2 O3 层的氧化速率低于NiCrAlY层 ,且随Al2 O3 第二相含量的增加或粒径的减小 ,涂层氧化速率减小。通过氧化动力学曲线、氧化物的形貌和结构 ,分析了Al2 O3The oxidation resistance of NiCrAlY Al 2O 3 coatings obtained by plasma spraying and laser remelting(PS&LR)processes was studied.The range of content of Al 2O 3 second phase was 10%～30%(wt).And two types of grain size of Al 2O 3 which were 50～75μm and 0 31μm were used.As results of isothermal oxidation experiments at 1000℃ and 1050℃,the oxidation velocity of coatings obtained by plasma laser technology is only one half of that of plasma sprayed coatings.The oxidation velocity of NiCrAlY Al 2O 3 coatings is lower than that of NiCrAlY coatings.And the oxidation velocity of NiCrAlY Al 2O 3 coatings is decreased with the content of Al 2O 3 second phase increasing or the grain size of Al 2O 3 decreasing.By analyzing oxidation kinetics,oxides morphology and structure,the mechanism that Al 2O 3 second phase and laser remelting improved oxidation resistance of NiCrAlY plasma sprayed coatings were discussed.

关 键 词：等离子-激光 NiCrAlY-Al2O3层 抗氧化性 氧化速率 

分 类 号：TG156.99[金属学及工艺—热处理]