研究Si对TiC在铝熔体中稳定性的影响。结果表明:当一定量的Si加入到铝熔体中后,TiC变得不稳定。当熔体温度低于890℃时,TiC会与Al及Si反应生成TiAlxSiy和Al4C3相;而当熔体温度高于890℃时,TiC与Al和Si反应生成Al4C3及Ti3SiC2相。分析认为,Si之所以使TiC在铝熔体中变得不稳定,是由于铝熔体中的Si能够进入到TiC晶格中,并进一步扩散,形成夹杂有一定量Si的TiC。在此过程中,Si会在TiC中引起较大的晶格畸变作用,促进TiC中碳原子的迁移。 The effect of Si on the stability of TiC in aluminum melt was investigated. The results show that TiC becomes unstable when a certain amount of Si is added to the aluminum melt. When the melt temperature is lower than 890 ℃, TiC reacts with Al and Si to form TiAlxSiy and Al4C3 phases. When the melt temperature is higher than 890 ℃, TiC reacts with Al and Si to form Al4C3 and Ti3SiC2 phases. It is considered that the reason why Si becomes unstable in the aluminum melt is that Si in the aluminum melt can enter into the TiC lattice and further diffuse to form TiC mixed with a certain amount of Si. In the process, Si will cause larger lattice distortion in TiC and promote the migration of carbon atoms in TiC.