液相法制备碳碳复合材料Si-W涂层表面氧化层的结构

STRUCTURE OF THE OXIDE FILM ON THE SiW COATING FOR C/C COMPOSITES PREPARED BY LIQUID REACTION FORMATION METHOD

研究了一种液相法及其它方法制备的碳碳复合材料多层防氧化涂层，并用ＸＲＤ，ＳＥＭ，Ｒａｍａｎ光谱和ＥＭＰＡ研究了液相法制备的ＳｉＷ涂层表面氧化后的结构。研究结果表明：氧化后涂层表面生成石英玻璃，且由于Ｗ的高价氧化物进入玻璃的分子网络结构，使其能长时间保持稳定而不析晶。Ｗ离子来自液态Ｓｉ中溶解的Ｗ，扩散使表面Ｗ离子比氧化层内部低很多，氧化后涂层表面的断键程度很高。

A multi layer coating with a SiW outer layer by liquid reaction formation method was prepared for carbon carbon composites,and then the structure of the oxide film on the coating was investigated by XRD,SEM,Raman spectrum and electron probe.The results show that a silica glass layer is formed in the oxidation process.The high valence W ion will get into the molecule net of the silica in the oxidation,and bulk crystallization will not take place in the glass layer for a long time.The broken bonds of the silica surface are much more than those of the fused silica because of the diffusion of W ion.