人工心瓣含硅热解炭涂层残余应力分析  

Analysis of Residual Stress of Silicon-alloyed Pyrocarbon Coatings for Artificial Heart Valves

作　　者：杨欢[1] 张建辉[1] 

机构地区：[1]杭州电子科技大学机械工程学院,杭州310018

出　　处：《表面技术》2014年第1期7-10,58,共5页Surface Technology

基　　金：国家自然科学基金(50975070);浙江省自然科学基金(LY12E05002)~~

摘　　要：目的研究人工心瓣含硅热解炭涂层的残余应力。方法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。结果试样只包含热解炭与SiC两种物相,SiC颗粒尺寸小于10μm,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 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。Objective To investigate the residual stress of silicon-alloyed pyrocarbon for mechanical heart valves. Methods The silicon-alloyed pyrocarbon coating was prepared by the chemical vapor deposition method, and the composition and structure of the coating were investigated. The residual stress on the surface of the coating was studied by X-Ray diffraction and FEM. Results The results showed that the coating consisted of two phases, pyrolytic carbon and SiC, the SiC particle size was about 10 p,m and uni formly dispersed in the pyrolytic carbon. The results of X-ray diffraction experiment for two samples were -7 MPa and -9 MPa, and the FEM result was about -6 MPa. Conclusion The residual stress of SiC was compressive stress ,and the FEM result was in accordance with the experiment result. The influence of particle size on the material residual stress was not obvious.

关 键 词：人工心瓣 热解炭 SIC 残余应力 X射线衍射 有限元 

分 类 号：TG174.444[金属学及工艺—金属表面处理]