EVALUATION OF MECHANICAL CHARACTERISTICS OF BIO-CERAMIC FUNCTIONALLY GRADIENT COATING IMPLANT

生物陶瓷功能梯度涂层植入物的机械特性评估

基本信息

批准号：
11650073
负责人：
SHIBANO Jun-ichi
金额：
$ 2.05万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The purpose of research is to evaluate the mechanical characteristics of a bio-ceramic functionally gradient coating implant from a point of view of residual stress and adhesion strength. The bio-ceramic functionally gradient coating specimen was made using atmospheric plasma-spray processing. Four layers in which the volume mixture ratio of the hydroxyapatite and the titanium gradually change were subsequently coated on the surface of titanium substrate. The thickness of each layer was 20μm. The mechanical characteristics of the functionally gradient coating specimen were compared with those of the specimen coated only with hydroxyapatite.(1) The residual stress generated in the coating layer was measured using X-ray diffraction method. The characteristic X-ray of Mo-Kα was used. The (002) lattice plane of hydroxyapatite was selected in this experiment. The following results were confirmed.(a) Compressive residual stress of 224MPa existed in the functionally gradient coating layer.(b) … More Compressive residual stress of 295MPa in the coating layer of the specimen coated only with hydroxyapatite was measured.(c) The compressive residual stress in the coating layer of the bio-ceramic coating specimen decrease when using a functionally gradient coating.(2) The adhesion strength of the coating layer was evaluated using three-point bending method. The bending specimen of 60×10×2mm^3 was coated with hydroxyapatite and titanium in the same manner as state above. The span for three-point bending was 42mm. The specimen was loaded until the maximum deflection became 3mm. The size of delaminated area of coating layer was measured. The following results were confirmed.(a) The delaminated areas of the functionally gradient coating specimen and the specimen coated only with hydroxyapatite were 4.6mm^2 and 10.9mm^2, respectively.(b) The functionally gradient coating specimen is superior in the adhesion strength of coating layer in comparison with the specimen coated only with hydroxyapatite. Less

研究的目的是从残余应力和粘附强度的角度评估生物陶瓷功能梯度涂层植入物的机械特性，生物陶瓷功能梯度涂层样本采用大气等离子喷涂工艺制成四层。随后将羟基磷灰石和钛渐变的体积混合比涂覆在钛基体表面上，每层厚度为20μm，并与功能梯度涂层试样的力学特性进行比较。 (1)采用X射线衍射法测定涂层中产生的残余应力，采用Mo-Kα的特征X射线。本实验证实了以下结果。(a) 功能梯度涂层中存在 224MPa 的残余压应力。(b) … 更多残余压应力测得仅涂覆羟基磷灰石的样品涂层中的压力为295MPa。(c)使用功能梯度涂层时，生物陶瓷涂层样品涂层中的残余压应力降低。(2)涂层的附着强度采用三点弯曲法对 60×10×2mm^3 的弯曲试样按上述方法涂覆羟基磷灰石和钛。三点弯曲为42mm，测量涂层的最大挠度为3mm，确认了以下结果。仅涂覆羟基磷灰石的试样厚度分别为4.6mm^2和10.9mm^2。(b)与功能涂层梯度试样相比，涂层的附着强度优于功能涂层梯度试样。仅涂有羟基磷灰石。