中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 18 No. 3 June 2008 |
（1. College of Environment and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China;2. School of Materials, Northwestern Polytechnical University, Xi’an 710072, China;3. Department of Chemistry, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University,Xi’an 710069, China）
Abstract: Interfacial reaction and its mechanism of SiC/Ti composite were revealed by chemical kinetic studies. A two-step dynamic model of interfacial reaction in SCS-6 SiC/Ti composites was built up, and the rate constant and the activation energy of the interfacial reactions were obtained based on the quantum chemistry calculation. The results show that the first step, in which the atomic Ti, C and Si are decomposed from Ti matrix and SiC fiber, respectively, is a rate-determined step because the activation energy of the step is much larger than that of the second one in which deferent interfacial reaction products form. The theoretically predicted result of the interfacial reaction is coincident with that of experimental observation.
Key words: quantum chemistry; SiC/Ti composites; interfacial reaction; chemical kinetics
