冷坩埚法制备α-Al_2O_3多晶材料的工艺参数研究  

Study on Process Parameters of Polycrystalline α-Al_2O_3 Prepared by Cold Crucible Method

作　　者：王娇[1,2] 李红军[2] 弓巧侠[1] 徐晓东[2] 张道标[3] 何雪梅[3] 徐军[2] 

机构地区：[1]郑州大学物理工程学院,郑州450001 [2]中国科学院上海硅酸盐研究所协鑫蓝宝石晶体材料研发中心,上海201800 [3]中国科学院上海硅酸盐研究所,上海200050

出　　处：《人工晶体学报》2012年第3期578-583,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(60938001)

摘　　要：采用冷坩埚法制备α-Al2O3多晶料,研究了引燃剂的形态、坩埚下降的速率、加料速率等工艺参数变化对所成形晶碇质量的影响。结果表明:采用的引燃剂为高纯铝片,坩埚下降速率为10 mm/h,采取加料速率为1 kg/min的最佳工艺条件,可制备出高致密度、高纯度的α-Al2O3多晶料。采用排水法测密度,用电感耦合等离子体原子发射光谱仪(ICP-OES)对原料粉和多晶块料中Ca、Fe、Na、Mg、K、Ti、Si、Cr等元素进行测定。结果表明:多晶块料中白色可用部分Ca、Fe、Na、K、Ti、Si、Cr等元素明显降低,说明采用冷坩埚法制备的氧化铝多晶料对原料粉具有一定的提纯作用,并且测量其堆积密度为2.6～2.8 g/cm3。因此采用冷坩埚法制备的α-Al2O3多晶料符合目前生长大尺寸蓝宝石对原料的要求。Polycrystalline α-Al2O3 materials were prepared by cold crucible method.The effects of the ignition agents,the withdrawal velocity,the feeding rate and other process parameters on the quality of crystallization were investigated.The results showed that the optimum conditions for preparing high-density,high-purity polycrystalline α-Al2O3 materials as followed： high-purity aluminum flakes as ignition agents,withdrawal velocity rate in 10 mm/h and feeding rate in 1 kg/min.The density of samples is tested by draining method,the impurities concentrations of Ca,Fe,Na,Mg,K,Ti,Si and Cr in raw powder and polycrystalline α-Al2O3 materials prepared by cold crucible are analyzed by ICP-OES.The concentrations of impurities in polycrystalline α-Al2O3 materials can be decreased comparison with in raw powder,which shows that it is an effective method for the removal of impurities.The bulk density of polycrystalline α-Al2O3 is 2.6-2.8 g/cm3.Polycrystalline α-Al2O3 materials prepared by cold crucible meet the current growth of large-size sapphire for raw materials requirements.

关 键 词：冷坩埚法 Α-AL2O3 多晶制备 

分 类 号：TG156.97[金属学及工艺—热处理]