摘要
以氢氧化铝为原料,将其洗涤预处理后在1 200,1 230,1 250,1 350,1 430℃下煅烧,然后再球磨不同时间制得Al2O3粉体,研究了原料预处理、煅烧温度及球磨时间对煅烧后Al2O3产物中α相的转化率、比表面积及粒径的影响。结果表明:原料预处理可以明显降低原料中Na2O的含量,从而提高煅烧后Al2O3产物中α相的转化率,并降低产物中Na2O的含量;最佳的煅烧温度为1 250℃,该温度下制备的α-Al2O3具有较高的转化率和较好的活性,经球磨8h后,其粒径可以达到亚微米级。
Aluminum hydroxides as raw material were calcined at 1 200,1 230,1 250,1 350,1 430 ℃ after pretreatment of washing.Sub-micron alumina were prepared after grinding for different periods of time.The effect of pretreatment of raw materials,calcination temperature and grinding time on theα-phase conversion rate,specific surface area and particle size of Al2O3.The results show that the pretreatment of raw material obviously reduced the content of Na2 O in raw material,and then improved the conversion rate ofα-phase and reduced the content Na2 O in products.The optimum calcination temperature was 1 250 ℃,at which theα-Al2O3 of high conversion rate and good activity could be obtained,and particles were in sub-micron size after grinding for 8h.
出处
《机械工程材料》
CAS
CSCD
北大核心
2015年第2期42-44 59,59,共4页
Materials For Mechanical Engineering
