Residual stress evaluation of hydroxyapatite coating Ti implant
Residual stress evaluation of hydroxyapatite coating Ti implant
复制标题
羟基磷灰石涂层钛种植体的残余应力评估
DOI：
10.1299/jsmea.40.328
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Ukai
中科院分区：
文献类型：
--
作者：
S. Tadano;M. Todoh;J. Shibano;T. Ukai
生物活性陶瓷具有与骨结合的能力，已被开发为最有效的植入材料之一。由于这些材料由脆性羟基磷灰石组成，其机械可靠性和可加工性远低于金属。因此，羟基磷灰石陶瓷被用作涂层材料。在涂层过程期间或之后，植入物的涂层中经常发生开裂和撕裂。这些缺陷是由涂层界面附近的残余应力引起的。因此，对该区域残余应力的评估具有重要意义.工作的目的是提出一种方法，同时和非破坏性的三维分布的残余应力在羟基磷灰石涂层和钛基体，使用多色X射线测量。通过该方法，确认了涂层中的陡峭应力梯度和基材表面上的拉伸残余应力的增加。
Bio-active ceramics which have the capability for bonding to bone have been developed as one of the most effective implant materials. Because these materials consist of brittle hydroxyapatite, their mechanical reliability and workability are much lower than those of metal. Therefore, hydroxyapatite ceramics are used as coating materials. During or after the coating process, cracking and tearing often occur in the coating layer of the implant. These defects are caused by the residual stress in the vicinity of the coating interface. It is important to evaluate the residual stress in this region. The purpose of work is to present a method for measuring simultaneously and nondestructively three-dimensional distribution of residual stress in both the hydroxyapatite coating layer and the titanium substrate, using polychromatic X-rays. From this method, the steep stress gradient in the coating layer and the increase in tensile residual stress on the surface of the substrate were confirmed.