TiO2添加剂对等离子喷涂生物涂层HAP结合强度的影响

主要研究医用钛合金仿人类关节表面改性的课题。采用等离了喷涂技术，以Ｔｉ６ＡＩ４Ｖ为基体，在表面喷涂一定厚度的与肌肉容易长合的羟基磷灰石（ＨＡＰ）涂层，为了提高涂层的结合强度，加入了ＴｉＯ２添加剂。研究了不同含量的添加剂对涂层结合强度的影响，通过对涂层结合强度测试结果表明，ＴｉＯ２添加剂的加入大大提高了涂层的结合强度，而且ＴｉＯ２添加剂含量的不同，结合强度值也不同。用扫描电镜（ＳＥＭ）观察了涂层的断口形貌，发现涂层发生了部分韧化，主要是未熔的ＴｉＯ２在涂层中起到了增韧的作用。用Ｘ身线衍射（ＸＲＤ）分析了涂层的相结构，发现ＴｉＯ２添加剂直接或间接地使ＨＡＰ分解产生了新相，主要有α－ＴＣＰ等相，形成了相变韧化。

Influence of Additive TiO2 on the Bonding Strength of Plasma-sprayed Biologic HAP Coating

In this paper, the surface modification technology for Tianium alloy used in the fabrication of artificial joint is investigated. A layer of HAP, on which the muscle will grow easily, is coated on the Ti alloy substrate by Plasma spraying. In order to enhance the bonding strength between coating and the base metal, the TiO2 added into the coating as additive. SO, the influence of additive with different content on the bonding strength of the coating is investigated in detail. The bonding strength testing results show that adding additive TiO2 can improve the bonding strength greatly, and with different content of additive will oblaine the dif- ferent result. The fracture appearances are analyzed by means Of SEM, which show that the toughness of the coating is improved by adding the Tio2. Through XRD analysis of the coating, it is found that the TiO2 in the coating can make some of the HAP decompose to produce new phase, such as a -- TCP. It is these new phases that act as the toughenting role.