复合添加剂对氧化铝陶瓷烧结性和抗热震性的影响  

Effect of compound additives on sinterability and thermal shock resistance of alumina ceramics

作　　者：李家茂[1] 龙世刚[2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽工业大学冶金与资源学院,安徽马鞍山243002

出　　处：《粉末冶金技术》2009年第4期273-276,共4页Powder Metallurgy Technology

基　　金：安徽省科技厅国际合作资助项目(250806)

摘　　要：研究了复合添加剂MnO2、MgO和Y2O3对Al2O3陶瓷烧结性和抗热震性的影响。试验结果表明:在复合添加剂中引入MgO和Y2O3大幅度提高了Al2O3陶瓷的致密度,促进了陶瓷的烧结,提高了材料的强度。Al2O3陶瓷的抗热震性能也得到提高,当MgO和Y2O3的含量为0.5%时,Al2O3陶瓷的临界热震温差在300℃左右,抗热震性能大大提高;继续增加MgO和Y2O3的含量,其抗热震性有所降低。添加复合添加剂的Al2O3陶瓷的抗热震性受到细晶强化和气孔的共同控制,对抗热震性提高的主要贡献为细晶强化,但气孔也会影响其抗热震性。The effects of compound additives containing MnO2, MgO and Y2O3 on sinterability and thermal shock resistance of alumina ceramics were studied in this paper. The experimental results show that the density of alumina ceramics is obviously improved, the sinterability is promoted and the flexural strength is enhanced by adding MgO and Y2O3 in compound additives. At the same time the thermal shock resistance of alumina ceramics is improved to some extent. The critical temperature difference of alumina ceramics is about 300℃ when the addition of MgO and Y2O3 is 0. 5wt% , so the thermal shock resistance is improved significantly. But the thermal shock resistance is decreased in some degree when the addition of MgO and Y2O3 is over 0.5wt%. The thermal shock resistance of alumina ceramics doped with compound additives is common controlled by fine grained strengthening and porosity. The improvement of the thermal shock resistance can be mainly attribute to fine grained strengthening and partly due to porosity.

关 键 词：复合添加剂 氧化铝陶瓷 烧结性 抗热震性 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ175.713[化学工程—硅酸盐工业]