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Cross-sectional analysis on microstructure of plasma-sprayed HA+TiO_2 composite coatings on titanium substrate

Cross-sectional analysis on microstructure of plasma-sprayed HA+TiO_2 composite coatings on titanium substrate
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摘要 The cross-sectional analysis on hydroxyapatite （HA） coating and HA+TiO2 composite coating was conducted by using electron probe microanalyser （EPMA）. The results reveal that annealing at 650 ℃ leads to the cracking within the HA coating or along the coating/substrate interface. The ribbon-like regions in HA coating are verified to contain less PO4-4 groups resulted from the high temperature melting of HA particles in plasma flame. From the viewpoint of microstructural observation, it can be concluded that the addition of TiO2 into HA coating can effectively strengthen and toughen the whole coating system with a shift of the well-bonded interface from the THA （top HA） coating/HTBC （HA+TiO2 bond coat） interface in the as-sprayed THBC （top HA-HTBC） coating to the HTBC/Ti substrate interface in the heat treated THBC coating. The THA coating bonds well to Ti substrate perhaps via its TiO2 hobnobbing with the Ti oxides formed on the Ti substrate. The cross-sectional analysis on hydroxyapatite (HA) coating and HA+TiO_2 composite coating was conducted by using electron probe microanalyser (EPMA). The results reveal that annealing at 650 ℃ leads to the cracking within the HA coating or along the coating/substrate interface. The ribbon-like regions in HA coating are verified to contain less PO^(4-)_4 groups resulted from the high temperature melting of HA particles in plasma flame. From the viewpoint of microstructural observation, it can be concluded that the addition of TiO_2 into HA coating can effectively strengthen and toughen the whole coating system with a shift of the well-bonded interface from the THA (top HA) coating/HTBC (HA+TiO_2 bond coat) interface in the as-sprayed THBC (top HA-HTBC) coating to the HTBC/Ti substrate interface in the heat treated THBC coating. The THA coating bonds well to Ti substrate perhaps via its TiO_2 hobnobbing with the Ti oxides formed on the Ti substrate.
作者 吕宇鹏 李木森 王建华 孙瑞雪 李士同 朱瑞富
机构地区 School of Materials Science and Engineering School of Stomatology
出处 《中国有色金属学会会刊：英文版》 CSCD 2004年第6期1139-1144,共6页 Transactions of Nonferrous Metals Society of China
基金 Project ( 0 3 2 0 40 10 5 )supportedbytheDepartmentofScienceandTechnologyofShandongProvince China
关键词 羟磷灰石 合成复层 等离子体喷雾 热处理 cross-sectional analysis hydroxyapatite composite coating plasma spraying
分类号 R318.08 [医药卫生—生物医学工程]
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参考文献26

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中国有色金属学会会刊：英文版
2004年 第6期

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