采用大气等离子喷涂方法,成功地制备了HA/TiO2复合涂层,对复合涂层的结合强度、微观结构、水浸渍下的表面形貌进行了较为深入的研究. 结果表明,由于TiO2的加入,HA/TiO2涂层的结合强度明显高于纯HA涂层,而且导致涂层破坏机理由粘合破坏向内聚破坏转化. 这是由于HA/TiO2的复合缓和了涂层与基体间的膨胀系数失配现象,改善了涂层与基体之间的结合. SEM观察显示,HA/TiO2涂层表面有一些细小的裂纹,但在去离子水中浸泡后就会消失,而且不容易产生新的裂纹,这说明TiO2的加入不但改善了涂层与基体之间的结合,同时增强了涂层内部颗粒的结合.
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