Preparation of C/SiC Composites at Low Temperature
ZHOU Chang-cheng1,2, ZHANG Chang-rui2, HU Hai-feng2, ZHANG Yu-di2
1. Architectural Engineering Institute of General Logistics Department, Xi’an 710032,China;
2. College of Aerospace & Materials Engineering, National University of Defense Technology,Changsha 410073,China
Abstract：In order to introduce actively cooling technology into ceramic matrix composites, it is essential to decrease the preparation temperature of ceramic matrix composites. The conversion process of the polycarbosilane (PCS) into silicon carbide (SiC) was investigated by TG-DTA, infrared spectrum analysis (IR) and X-ray diffraction (XRD) etc, which indicated the feasibility of transition from PCS to SiC ceramic at low temperatures under 1000℃. The carbon fiber reinforced silicon carbide (C/SiC) composites were hereby prepared at low temperatures as 900℃ through precursor infiltration and pyrolysis (PIP), and polycarbosilane (PCS) acted as precursor, carbon fiber as enhanced fiber. The results show that the mechanical properties of C/SiC composites prepared at 900℃ are excellent, flexural strength of composites prepared at 900℃ reaching 657.8MPa,shear strength 61.02MPa, fracture toughness 22.53MPa·m1/2, and density being only 1.70g/cm3. Furthermore, the fracture surface was analyzed by SEM.
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