等离子喷涂HA/TiO_2复合涂层  

Plasma Sprayed HA/TiO_2 Composite Coatings

作　　者：郑学斌[1] 周霞明[1] 张叶方[1] 丁传贤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》1999年第6期956-962,共7页Journal of Inorganic Materials

摘　　要：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徐层，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．HA/TiO2 composite coatings were fabricated successfully via atmospheric plasma spraying, whose bonding strength, microstructure and surface mophology after immersion in deionized water were investigated. The obtained results reveal that the bonding strengthes of HA/TiO2composite coatings are much higher than that of HA coating and the fracture mechanism of the coating changes from adhesive failure to cohesive failure owing to the addition of TiO2 in the coating. The reason for this is the addition of TiO2 in the coating reduces the mismatch of thermal expansion coefficient between the coating and the substrate. SEM obeservation shows that there are some micro cracks in the composite coatings which disappear after immersion in deionized water for a day, and almost no new cracks generate again. This means that both the adhesive strength and the cohesive strength are improved by the addition of TiO2 in the coating.

关 键 词：HA涂层 强度 等离子喷涂 喷涂 二氧化钛 涂层 

分 类 号：R318.08[医药卫生—生物医学工程] TQ174.759[医药卫生—基础医学]