In situ synthesis mechanism of ZrC-ZrB2/Cu composites prepared by SHS-casting method |
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| Authors: | Mengxian Zhang Xianrui Zhao Hailong Yao Hongtao Wang Shibin Li Chao Yang Qingyu Chen Xiaobo Bai |
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| Affiliation: | 1. Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing, School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang, China;2. School of Naval Architecture & Ocean Engineering, Jiangsu Maritime Institute, Nanjing, China |
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| Abstract: | The self-propogating high-temperature syntheis (SHS) experiments in the glove box indicated that the combustion temperature decreased and the ignition time increased with increasing B4C size in Cu-Zr-B4C system. Once B4C size exceeded 28 μm, the full conversion of ZrC and ZrB2 failed. In situ ZrC and ZrB2 ceramic particle-reinforced Cu matrix composites were produced by the self-propagating high-temperature synthesis reaction of Cu-Zr-B4C system in molten Cu. Moreover, the phase formation mechanism was investigated by the combustion wave quenching experiment of Cu-Zr-B4C powder compact in Cu liquid. Results showed that ZrC and ZrB2 were mainly formed by the dissolution-reaction-precipitation mechanism. A developed method arresting the combustion front of a reactant in molten metal was proposed. |
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| Keywords: | borides carbides composites reaction path self-propagating high-temperature synthesis |
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