人工心瓣热解炭涂层的密度和孔隙结构研究  

Density and pore structure of pyrocarbon for mechanical heart valve prostheses

作　　者：张建辉[1] 宋银超 

机构地区：[1]杭州电子科技大学机械工程学院,杭州310018

出　　处：《功能材料》2015年第9期9072-9075,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50975070);浙江省自然科学基金资助项目(LY12E05002)

摘　　要：研究了人工心瓣热解炭涂层的密度和孔隙结构。采用准稳态流化床化学气相沉积工艺制备出人工心瓣用高密度各向同性热解炭涂层,利用密度计、扫描电镜、透射电镜、压汞仪等分析了热解炭涂层的密度和孔隙结构。结果表明:高密度各向同性热解炭的孔隙主要是由类球形生长特性间0.83μm左右的较大孔隙和62nm左右的中等孔隙以及类球形生长特性内缠结体结构所形成的微孔隙构成,缠结体之间形成的微孔隙能够导致热解炭密度的降低,热解炭类球形颗粒的多少也会对高密度各向同性热解炭的密度造成影响。Pyrocarbon for prosthetic heart valves was prepared by quasi-steady-state fluidized bed chemical vapor deposition.The density and the pore structure of pyrocarbon were investigated by densimeter,scanning electron microscope,transmission electron microscope and mercury injection apparatus.Results show that the pore in high density isotropic pyrocarbon deposited at low temperature is mainly composed of the larger pores of about 0.83μm and the medium pores of about 62 nm between particles in sphere-like structure and the micropores derived of entangled structure in spherical particles.The micro-pores from entangled structure can reduce the density of pyrocarbon and the amount of spherical particles in pyrocarbon could affect the density of pyrocarbon.

关 键 词：人工心瓣 热解炭 密度 孔隙结构 

分 类 号：TQ127.11[化学工程—无机化工]