Ni在Al-TiO_2-B_2O_3粉末机械合金化中的加速效应

Acceleration effect of Ni addition to Al-TiO_2-B_2O_3 powder during mechanical alloying

为了制备镍基Al_2O_3-TiB_2金属陶瓷涂层,研究了不同质量分数的Ni对球磨Al-TiO_2-B_2O_3粉末的影响。对球磨后的粉末进行了XRD、SEM、EDS和DSC测试分析。结果表明:加入适量Ni,在机械合金化过程中能够产生加速效应,缩短得到Ni基Al_2O_3-TiB_2金属陶瓷粉体的时间。Ni在机械合金化过程中的加速效应的机制是优先生成了Ni Al化合物,加速了TiO_2和B_2O_3中Ti和B被Al还原出来的反应,促进了化学反应10Al+3TiO_2+3B_2O_3=5Al_2O_3+3TiB_2的进行。

To prepare nickel-based Al2O3-TiB2 cermet coating,effect of different mass fraction of Ni for milling Al-TiO2-B2O3 powder was studied. Milled powder was investigated by SEM、EDS and DSC. The results show that adding an appropriate amount of Ni can produce accelerating effect during mechanical alloying process,shorten the time of obtaining the Ni-based Al2O3-TiB2 metal ceramic powder.Acceleration effect mechanisms of Ni in the mechanical alloying process is preferentially generated Ni Al compound,which accelerate reduction reaction,and promote the chemical reaction of 10 Al ＋ 3TiO2＋ 3B2O3= 5Al2O3＋ 3TiB2.