人工心瓣含硅热解炭涂层残余应力分析-表面技术.PDF

第43卷摇 第1期 摇 摇 摇 表面技术 摇 摇 2014年02月 SURFACE TECHNOLOGY ·7 · 試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試 人工心瓣含硅热解炭涂层残余应力分析 杨欢,张建辉 (杭州电子科技大学 机械工程学院,杭州310018) 摘摇 要: 目的摇 研究人工心瓣含硅热解炭涂层的残余应力。 方法摇 通过化学气相沉积法制备含硅热解 炭涂层,并对涂层进行物相与结构分析。 利用X射线衍射法测定涂层表面SiC相残余应力,采用有限元 法模拟含硅热解炭涂层表面残余应力情况。 结果摇 试样只包含热解炭与SiC 两种物相,SiC颗粒尺寸小 于10 滋m,分散在热解炭基质中。 X射线衍射法测得两个试样SiC相残余应力值分别为-7,-9 MPa,有限 元分析得出颗粒内残余应力约-6 MPa。 结论摇 SiC相残余应力为压应力,有限元分析结果与实验值有较 好的吻合。 颗粒的尺寸对材料残余应力的影响并不明显。 关键词:人工心瓣;热解炭;SiC;残余应力;X射线衍射;有限元 中图分类号:TG174.444摇 摇 摇 文献标识码:A摇 摇 摇 文章编号:1001鄄3660(2014)01鄄0007鄄04 Analysis of Residual Stress of Silicon鄄alloyed Pyrocarbon Coatings for Artificial Heart Valves YANGHuan,ZHANGJian鄄hui (School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou310018,China) ABSTRACT:Objective Toinvestigatetheresidual stressof silicon鄄alloyedpyrocarbonformechanicalheartvalves. MethodsThe silicon鄄alloyed pyrocarbon coating waspreparedby the chemical vapor deposition method,andthe composition and structureof the coating wereinvestigated. Theresidual stressonthesurfaceofthecoatingwasstudiedbyX鄄Ray diffractionandFEM. ResultsThe results showed that the coating consisted of two phases,pyrolytic carbon and SiC,the SiCparticle sizewas about 10 滋m and uni鄄 formly dispersed in the pyrolytic carbon. The results of X鄄ray diffraction experiment for two samples were -7 MPa and -9 MPa, andthe FEM result was about -6 MPa. Conclusion The residual stress of SiCwas compressive stress,and the FEM result was in accordancewith the experiment result. The influence of particle size on the material residual stresswas not obvious. KEY WORDS:artificial heart valve;pyrocarbon;SiC;res