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借助XRD、EPMA、TEM和SEM等分析测试手段对铝熔体中原位反应合成TiC进行的研究表明:(1)形成Al3Ti放出的热量可能是引发后续TiC反应的原因之一;(2)整个反应过程中,扩散机制和溶解-析晶机制实际上都存在。在相对较低的温度区时,是由较慢的扩散过程控制整个反应。这时,随压制块温度升高,首先发生3Al(l)+Ti(s)→Al3Ti的反应,然后通过该反应的反应热引发TiC的反应;而高温区时,是由溶解-析晶过程控制整个反应
The results of XRD, EPMA, TEM and SEM analysis on the in-situ reaction of TiC in aluminum melt show that: (1) The formation of Al3Ti is probably one of the reasons for the subsequent TiC reaction; (2) The whole reaction In the process, the diffusion mechanism and dissolution-crystallization mechanism actually exist. At relatively low temperature, the entire reaction is controlled by the slower diffusion process. At this time, as the temperature of the pressing block increases, the reaction of 3Al (l) + Ti (s) → Al3Ti occurs first and then the reaction of TiC is initiated by the reaction heat of the reaction; while in the high temperature zone, the reaction is controlled by the dissolution- The whole reaction