摘要：以440℃预烧后的AlOOH或无定形Al₂O₃为原料,乙醇为分散剂,采用机械球磨和常压焙烧法制备α-Al₂O₃粉体,探讨矿化剂AlF3及机械球磨对α-Al₂O₃性能的影响,利用扫描电镜、X射线衍射、X射线圆盘式离心粒度分析仪等手段对α-Al2O3粉体分散性、颗粒形貌和物相进行表征。结果表明,焙烧后得到纯α-Al2O3相粉体,且随着AlF3用量的增加,α-Al₂O₃粉体的分散性变差,α-Al₂O₃的形貌由多维向二维转化,从而形成片状α-Al₂O₃;由于机械力化学及F-的作用,球磨4 h出现六方片状α-Al₂O₃,且随着球磨时间的延长,六方片状α-Al₂O₃数量增多,粒径增大。

关键词：氧化铝；矿化剂；机械球磨

Abstract：α-Al₂O₃ powders were prepared by mechanical ball-milling and normal pressure sintering method using AlOOH pre-sintered at 440 ℃ as raw materials and ethanol as dispersants.The effects of AlF3 as mineralizer and mechanical ball-milling on performances of α-Al₂O₃ powders were investigated.SEM,XRD,BI-XDC were adopted to characterize the structural properties of α-Al₂O₃ powders.The results indicate that the pure α-Al₂O₃ phase are obtained after roasting.The dispersivity of α-Al2O3 powders becomes worse with the increasing amount of AlF3.The appearance of α-Al₂O₃ changes from multidimensional to two-dimensional then probably becomes to plate type.Due to the effect of mechanochemistry and F-,hexagonal α-Al₂O₃ platelets appear after milled for 4 h.With the extension of ball-milling time,the amounts and particle size of hexagonal α-Al₂O₃ platelets increase.

Keywords：alumina；mineralizer；ball-milling