APPLICATION OF ACTIVE FILLER IN PREPARATION OF FIBER REINFORCED CERAMIC MATRIX COMPOSITES BY POLYMER-INFILTRATION-PYROLYSISII——PREPARATION AND PERFORMANCE TEST OF COMPOSITES

Application of active filler aluminium (Al) in preparation of Jilin carbon fiber (JC) and M40JB fiber reinforced ceramic matrix composites (FRCMCs) by polymer-infiltration-pyrolysis (PIP) was investigated, respectively. The results showed that, after 7 cycles of polymer infiltration-pyrolysis, the flexural strength of the as-fabricated composites reinforced by JC was higher than that of those reinforced by M40JB when active filler was not added. Therefore, JC was more suitable for the reinforcement of FRCMCs than M40JB by PIP process. The flexural strength of the composites with active filler Al decreased drastically for the harmful interphase produced by the reaction between Al and carbon fiber, which was accordingly degenerated badly. The image analysis showed that the reaction layer between M40JB and Al was about 0.94μm. Suitable surface treatment of the carbon fiber such as coating was necessary to prevent the fiber from reacting.