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。
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.
出处
《中国粉体技术》
CAS
北大核心
2012年第5期65-68,共4页
China Powder Science and Technology
