摘要
研究了在用熔体反应法制备Ａｌ－Ｔｉ－Ｃ中间合金过程中ＴｉＣ形成的热力学与动力学．实验结果表明：在８５０℃的Ａｌ熔体中，石墨颗粒周围的 Ｋ２ＴｉＦ６与 Ａｌ发生剧烈的化学反应放出大量的热，在熔体中形成大量的局部高温微区．在这些高温微区内，熔体中的 Ｔｉ或 ＴｉＡ１３达到了与 Ｃ形成 ＴｉＣ的热力学条件，从而在石墨颗粒周围生成大量 ＴｉＣ粒子．根据熔体化学反应的热力学条件，提出了 ８５０℃ 下在 Ａｌ－Ｔｉ－Ｃ中间合金中 ＴｉＣ形成的动力学模型。ＴｉＣ形成的最佳反应时间为 ３－５ ｍｉｎ，此时形成的 ＴｉＣ晶核最有效，制备的 Ａｌ－Ｔｉ－Ｃ中间合金细化效果最佳．
The thermodynamics and the kinetic of forming TiC in Al-Ti-C system have been studied. The experiment shows that abundant heat was given out through the reaction between K2TiF6 and Al melt at 850 ℃, which resulted in local high temperature zones around graphite particles in melt in very short time and promoted Ti or TiA13 to react with C in melt according to the thermodynamics reactive conditions of forming TiC, therefore, a large number of TiC particles were formed around glaphite particles. The dynamical model of forming TiC at 850 ℃ was set up according to thermodynamics conditions and kinetic theory of melt chemical reaction. The optimal reacting time is 3-5 min, and the formed TiC nucleus are most efficient to the refining effect of the Al-Ti-C master alloys.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第10期1025-1029,共5页
Acta Metallurgica Sinica
基金
山东省优秀青年科学家科研奖励基金! 9814
