莫来石溶胶涂层炭纤维及其表征方法

MULLITE SOLGEL COATINGS ON CARBON FIBERS AND THEIR CHARACTERIZATION

采用溶胶－凝胶（ｓｏｌ－ｇｅｌ）技术，以正硅酸乙酯和硝酸铝为基本原料，按莫来石（３Ａｌ２Ｏ３·２ＳｉＯ２）的组成配制成溶胶。将此溶胶对炭纤维进行涂覆并无机化，得到在纤维单丝表面分布与结合良好的氧化物涂层。此涂层对炭纤维的高温抗氧化性有明显提高。运用Ｘ—衍射、ＳＥＭ、ＴＧ／ＤＴＡ、ＦＴＩＲ、涂层厚度估算等方法对炭纤维涂层进行了表征。

A binary oxide sol was prepared using Si(OEt)_4,and Al(NO_3)_3.Welldistributed and dense Al_2O_3SiO_2 or mullite coating on carbon fibers was obtained by solgel and inorganization processes. The coating protects the carbon fiber efficiently from the deterioration at high temperatures up to 700℃ in air. The structural and morphological features of the coating were characterized by XRD,SEM,TG/DTA and FTIR etc.