The optimum ball milling parameters were determined: ball gradation is 1:2:4,rotational speed rate is 170rpm, ratio of ball to powder is 20:1 and milling time is 15h.

• 经过正交试验确定的较优的球磨工艺参数为:磨球级配1:2:4,球磨机转速170rpm,球磨时间15h,球料比20:1。