| The wetting phenomena between A1 matrix and metal coated SiC fiber have been studied at 670℃ for 15 min-60 min under vacuum. SiC fibers were coated about 1000Å thickness with Ag, Cu, and Ni metal in high vacuum evaporator. The wetting behavior of Al/metallic thin film/SiC fiber was analysed by SEM, AES, and XRD. The wettability of metal coated SiC fibers was better than as-recieved SiC fiber, especially Ag and Cu coated SiC fibers were more effective. It was considered Chat the driving force for wetting was increased by interfacial reaction between metallic thin film and Al melt. When interfacial reaction involved the eutectic reaction, the interfacial free energy was sufficiently reduced to improve the wetting behavior, and aluminum oxide film was easily broken down by eutectic melt. The wetting behavior of as-recieved SiC fiber was not uniform and the contact angle was larger than 90°. |
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