Mechanical properties and Young's modulus of plasmasprayed hydroxyapatite coating on Ti substrate in simulated body fluid

被引:54
作者
Yang, YC [1 ]
Chang, E
Lee, SY
机构
[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan
[2] Natl Sun Yat Sen Univ, Inst Mat Engn, Kaohsiung 804, Taiwan
关键词
plasma spray; hydroxyapatite; Young's modulus; residual stress; bonding strength; simulated body fluid;
D O I
10.1002/jbm.a.10145
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
This study evaluated the Young's modulus, residual stress and strain, bonding strength, and microstructure of the plasma-sprayed hydroxyapatite coating (HAC) on Ti6A14V substrate with and without immersion in Hank's balanced salt solution (HBSS). The purpose was to explore the possible correlation of HAC durability and mechanical properties of the coating. The results show that the residual stress and strain, Young's modulus, and bonding strength of the HAC after immersion in HBSS are substantially decreased. The decayed Young's modulus and mechanical properties of HACs are accounted for by the degraded interlamellar or cohesive bonding in the coating due to the increased porosity after immersion that weakens the bonding strength of coating and substrate system. The biologic implications of the research are discussed in detail. This study contributes to the arguments that the method to alleviate the dissolution of HAC will increase the bonding strength of the coating system after immersion, which together with the controlled residual stress and strain in the coating might promote the long-term stability of the HA-coated implant. (C) 2003 Wiley Periodicals, Inc.
引用
收藏
页码:886 / 899
页数:14
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