Influence of Si on stability of TiC in Al melts

Si对TiC在铝熔体中稳定性的影响(英文)

The influence of Si on the stability of TiC in Al melts was studied.It is found that TiC particles in Al melts become unstable with the addition of Si.When the melting temperature is below 890 °C,TiC will react with Al and Si to form TiAlxSiy and Al4C3 phases.But if the melt temperature is above 890 ℃,TiC will react with Al and Si to form to Ti3SiC2 and Al4C3.It is considered that the influence of Si on the stability of TiC in Al melts is due to its incursion into TiC crystal lattice during the holding,which will cause serious lattice distortion in TiC and then speed up the out-diffusion of surrounded C atoms.

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。