高能球磨法制备ZrB2-Al2O3复合粉体

Preparation of ZrB_2-Al_2O_3 composite powder by high energy ball milling

以金属Al粉(w(Al)=99%,粒度≤45μm)、ZrO2粉(w(ZrO2)=99%,粒度≤3.5μm)和B2O3粉(w(B2O3)=98%,粒度≤5μm)为原料,按n(Al)∶n(ZrO2)∶n(B2O3)=10∶3∶3混合后装入高能球磨罐中,在氩气保护条件下以560r.min-1的转速球磨2h后,取样进行XRD和SEM分析。结果表明:采用金属Al粉、ZrO2和B2O3为原料,在2h的较短时间内经高能球磨合成ZrB2-Al2O3复合粉体,其合成机理为机械碰撞诱发的自蔓延反应;所得到的复合粉体中,ZrB2为微米级,Al2O3为纳米级。

ZrB2-Al2O3 composite powders were prepared by Al powder（w（Al）=99% and particle size ≤45 μm）, ZrO2 powder（w（ZrO2） =99% and particle size ≤3.5 μm） and B2O3 powder（w（B2O3） =98% and particle size ≤5 μm） as starting materials with n（Al） ： n（ ZrO2） ： n（B2O3）=10：3：3, mixing, putting into ball milling pot, milling for 2 h in argon atmosphere at 560 r ·min^-1. The prepared powders were analyzed by XRD and SEM. The results show that..the ZrB2 -Al2O3 composite powders can be prepared using Al,ZrO2 and B2O3 powders as starting materials within relatively short time （2 h） by high energy milling;the principle is self- propagating reaction brought out by machinery collides;the grain size of ZrB2（micron-size） is larger than that of Al2O3（nano-size） in the powders.