Al-TiO2-C晶粒细化剂对工业纯铝细化效果的影响

摘要

以TiO2粉、C粉、Al粉为原料,利用放热弥散法制备Al-TiO2-C晶粒细化剂,采用XRD,SEM,EDS等研究不同C与TiO2比例的细化剂的显微组织,并对工业纯铝进行细化实验.结果表明:Al-TiO2-C晶粒细化剂析出相为Al3 Ti,TiC和Al2 O3.当C与TiO2摩尔比为1:25~1:20时,Al-TiO2-C细化剂组织中Al2 O3颗粒数量适中且分布相对弥散.当C与TiO2摩尔比为1:20,该细化剂添加量为0.2%(质量分数)时,可将工业纯铝细化到约142μm,且保温1h未出现细化衰退.%The Al-TiO2-C grain refiners were synthesized by the in-situ exothermic dispersion method by using TiO2 ,C and Al powders as raw materials.The microstructure of Al-TiO2-C refiners with dif-ferent C/TiO2 was investigated by SEM,XRD and EDS.Grain refining test was carried out on indus-trial pure aluminum.The results show that Al-TiO2-C refiners are composed of Al3 Ti,TiC and Al2 O3 .When the mole ratio of C to TiO2 is between 1:25 and 1:20,the amount of Al2 O3 is moder-ate and its distribution is relatively dispersive.An excellent grain refining performance is obtained when adding 0.2% (mass fraction)Al-TiO2-C refiner with C/TiO2 is 1:20,the average grain size is about 142μm and there is no refining recession when holding 1h.