低温热处理以及高能球磨对制备超细氧化铝的影响  

Effects of low temperature heat treatment and high energy ball milling on the preparation of ultrafine alumina

作　　者：肖劲[1] 万烨[1] 邓华[1] 李劼[1] 刘业翔[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《粉末冶金技术》2006年第6期449-452,共4页Powder Metallurgy Technology

摘　　要：以Al2(SO4)3与(NH4)2CO3为原料,采用液相沉淀法,制备出前驱物NH4Al(OH)2CO3(碱式碳酸铝铵),利用低温热处理以及高能球磨对前驱物进行了处理,并煅烧得到-αAl2O3。运用XRD、振实密度、SEM等现代分析检测技术对样品进行表征。结果表明:采用低温热处理能改善Al2O3粉体的分散性,并能在一定程度上促进Al2O3的晶型转变;采用高能球磨能在很大程度上改善Al2O3粉体的分散性,并且能极大地促进Al2O3的晶型转变,制备出片状Al2O3粉末。经过低温热处理与高能球磨的前驱物,在1 100℃煅烧2h,能得到无团聚、粒径为500nm左右的片状超细-αAl2O3粉末。Ammonium aluminum carbonate hydroxide （AACH） was synthesized as the precursor by the precipitation reaction of aluminum sulfate and ammonium carbonate. Treated with low temperature heating and high energy ball milling, the precursor was then sintered to get α-Al2O3 powder. The properties of samples were characterized by XRD, tap density and SEM measurements. The results show that low temperature heat treatment can improve the dispersivity of ultrafine flake alumina, and can promote the phase transition of alumina; the dispersivity of the sample can be greatly improved by high energy ball milling, and the phase transition of alumina is also greatly promoted by high energy ball milling. Sintered at 1100℃ for 2h, the precursor treated with low temperature heating and high energy ball milling will be transferred into ultrafine flake α-Al2O3 powder without aggregation and with average particle size being about 500nm.

关 键 词：片状超细Al2O3 低温热处理 高能球磨 晶型转变 

分 类 号：TQ174.4[化学工程—陶瓷工业]