The influence of Ti: Si3N4 ratio on the microstructure evolution of Ti–Si3N4 reaction in Cu melts |
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| Affiliation: | 1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding, 071003, China;2. Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention, North China Electric Power University, Baoding, 071003, China;3. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China |
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| Abstract: | In this work, through the study of the obtained Cu–Ti–Si–N intermediate products by controlling the reaction degree of Ti and Si3N4 powder in Cu melts at 1250～1300 °C, the effects of different Ti: Si3N4 mass ratios on the microstructure evolution of Ti–Si3N4 reaction in Cu melts were verified. When the mass ratio of Ti: Si3N4 is higher, such as 3.09:1, TiN will cooperate with Ti5Si3 and depend on each other to nucleate and grow to form TiN/Ti5Si3 composites. The formed TiN are spherical and wetted by Ti5Si3 to uniformly disperse in Cu melts. As a result, the TiN–Ti5Si3 hybrid reinforced Cu matrix composites will be formed. However, when the mass ratio of Ti: Si3N4 is lower, such as 1.37:1, Ti and Si3N4 will firstly react to form TiN and Ti–Si liquid. The formed TiN are irregularly polygonal and connect with each other. The Ti–Si liquid will combine with Cu melts to form Cu–Ti–Si liquid and finally form δCu4Si, ηCu3Si and τ1-CuSiTi phases during the colling stage. In this case, TiN are difficult to be wetted, and the Ti–Si3N4 compact will keep its original shape and not spread in Cu melts. |
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| Keywords: | TiN Copper matrix composites Microstructures |
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