粉料和冷等静压对凝胶注模成型Al2O3陶瓷致密化的影响  

Effect of Powder and Cold Isostatic Pressing on Densification of AlO Ceramics Molded by Gelcasting

作　　者：杜苗凤 张培志[1] 郭方全[1] 祁海[1] 韩伟月 何成贵[1] DU Miaofeng;ZHANG Peizhi;GUO Fangquan;QI Hai;HAN Weiyue;HE Chenggui(Shanghai Key Laboratory of Engineering Materials Application and Evaluation,Shanghai Research Institute of Materials,Shanghai 200437,China)

机构地区：[1]上海材料研究所,上海市工程材料应用与评价重点实验室,上海200437

出　　处：《机械工程材料》2020年第10期28-32,共5页Materials For Mechanical Engineering

摘　　要：对平均粒径分别为0.31,0.77μm的2种Al2O3粉体(分别记为1^#和2^#)进行低固相含量(体积分数45%)凝胶注模成型,再经冷等静压(CIP)和常压烧结制备得到2种Al2O3陶瓷,研究了粉料和CIP压力(100~500 MPa)对Al2O3坯体和陶瓷致密化的影响。结果表明:粒径较小Al2O3粉体的分散难度较大,所需聚丙烯酸铵分散剂的添加量较高,所得坯体和烧结陶瓷的相对密度较小;随着CIP压力增加,2种Al2O3坯体的相对密度增大,孔洞减少,而2种烧结陶瓷的相对密度呈现先增大后减小再趋于稳定的变化趋势,当CIP压力为350~400 MPa时陶瓷的相对密度最大,晶间气孔较少。Two kinds of Al2O3 powder with average grain size of 0.31,0.77μm(named as 1#and 2#,respectively)was molded by low solid content(volume fraction of 45%)gelcasting,and then was cold isostaticly pressed(CIP)and pressurelessly sintered to obtain Al2O3 ceramics.Effects of powder and CIP pressure on densification of Al2O3 green body and ceramics were studied.The results show that the Al2O3 powder with smaller grain size was more difficult to disperse,and required higher addition amount of polyacrylate ammonium dispersant;the obtained green body and sintered ceramics had lower relative density.With increasing CIP pressure,the relative densities of the two Al2O3 green bodies increased,and the pores decreased;the relative densities of the two sintered ceramics showed a trend of increase first,then decrease,and then being stable.When the CIP pressures were 350-400 MPa,the two ceramics had the maximum relative densities and less intercrystalline pores.

关 键 词：AL2O3粉体 冷等静压 凝胶注模 团聚体 AL2O3陶瓷 

分 类 号：TB321[一般工业技术—材料科学与工程]