摘要
通过对仿生法制备的钛基羟基磷灰石(HA)涂层表面裂纹建立简化数学模型,得出线膨胀系数之差与温度变化量是影响裂纹产生的主要原因。通过等时间不同温度梯度干燥的试验,借助SEM扫描电镜分析,结果证明:增加温度梯度的干燥方案会使裂纹数目增加,但可以控制裂纹的尺寸,从而在一定程度上提高HA钙磷涂层与基体的结合强度,同时以37℃作为干燥的最终温度也可以减少干燥后裂纹的产生。
A simplification mathematical model was set up for cracks on the surface of hydroxyapatite coating based on titanium manufactured by bionic method. Then a conclusion was drawn that the main two factors that influenced microcracks formation were linear coefficient of expansion difference and temperature variation. Firstly, desiccation tests under conditions of equal time but different temperature gradiant were made. Then SEM analysis was used to prove that the number of cracks can become larger than before through the desiccation method of increasing temperature gradiant, but the size of cracks can be controlled, and thus the bonding strenghth of Ti-based hydroxyapatite coating and the matrix can be enhanced to some degree.Meanwhile, setting 37 ℃ as the final temperature of desiccation test can reduce the number of cracks.
出处
《热加工工艺》
CSCD
北大核心
2014年第22期145-148,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(50972086)
关键词
羟基磷灰石涂层
表面裂纹
应力强度因子
干燥温度
hydroxyapatite coating
surface crack
stress intensity factor
drying temperature
作者简介
党新安（1958-），男，陕西渭南人，教授，硕士，主要从事仿生人工骨的快速成型技术研究：电话：15829309726；E—mail：cao_xin_722@163．com
