Reaction behavior and formation mechanism of ZrC and ZrB2 in the Cu–Zr–B4C system |
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| Affiliation: | 1. College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, China;2. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China;3. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. CNR-ISTEC, Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy;2. Department of Materials Science and Engineering, Missouri University of Science and Technology, 322 McNutt Hall, Rolla, MO 65409, United States |
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| Abstract: | In this work, the formation mechanism of ZrC and ZrB2 in the Cu–Zr–B4C system was studied by differential scanning calorimeter and X-ray diffraction. Moreover, the effect of heating rate on the reaction behavior was also investigated. The results revealed that the heating rate did hardly influence the reaction process and product in the range of 10–30 °C/min. The formation mechanism of ZrC and ZrB2 in the Cu–Zr–B4C system could be ascribed to the solid-state reaction between Zr and B4C particles, and the replacement reactions of B4C with the Cu–Zr liquid and copper zirconium compounds. The addition of Cu in the Cu–Zr–B4C reactants can change the phase evolution route via producing various Cu–Zr intermediate phases and promote the formation of ZrC and ZrB2. |
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