Determination of Anisotropic Factors of Pyrolytic Carbon by Electron Diffraction
ZHANG Jian-hui
ZHA Xiao
SUN Hai-bo
School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China
摘要：The preferred orientation of pyrolytic carbon coating is an important performance parameter for the safe use of artificial mechanical heart valve.In this paper, the selected area electron diffraction (SAED) analysis of pyrolytic carbon coating samples of artificial heart valve was carried out by transmission electron microscopy (TEM), and the experimental method of characterizing the preferred orientation of pyrolytic carbon by electron diffraction spectrum, namely bacon anisotropy factor (BAF), was described,and the orientation angle and BAF corresponding to the electron diffraction spectrum were measured.The results show that the BAF value can directly reflect the anisotropy of pyrolytic carbon in the selected area. The BAF value range is from 1 to infinity, and the higher the preferred orientation is, the greater the value is. The BAF value decreases exponentially with the increase of orientation angle. When the pyrolytic carbon tends to be isotropic, the orientation angle tends to 180 and the BAF value tends to 1.
机标关键词：carbonanisotropicdeterminationdiffractionelectronfactorspyrolytic
分类号：TQ127.1(非金属元素及其无机化合物化学工业)
论文发表日期：2021-09-30
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：6( 105-110 )
英文信息