PyC的广义小滴沉积模式

通过偏光显微镜、扫描电镜(SEM)、X射线衍射(XDS)及X射线光电子能谱(XPS)考察了热解碳(Pyrocarbon,本文简写为PyC)的织构及生长特征等,提出了一个广义小滴沉积模式.PyC的光滑层(SL)、粗糙层(RL)及各向同性相(ISO)等三种主要织构的形成机制可由此模式得到满意的解释.

DEPOSITION MODEL OF DROPLET IN BROAD SENCE FOR PYROCARBONS

There have been several advanced deposition models for pyrocarbons up to now,but all the models are suitable only for a narrow limit and can not give sufficient explanation for the three main textures,namely smooth laminar (SL),rough lamlnar (RL)and lsotropic carbons (ISO). Based on the droplet model for pyrocarbons that was raised early,in this paper a droplet model in broad sence is given by studying the textures,growth features and the binding of carbon atoms of pyrocarbons on graphite substrate and matrix of unidirectional carbon/carbon composites (ID-C/C) prepared by chemical vapor deposition (CVD). Droplets in broad sense refer to all kinds of sphenoids that are more or less viscous. This model can explain the mechanism of the formation of SL,RL and ISO satisfactorily.