超重力下燃烧合成Al_2O_3/ZrO_2自生复合陶瓷研究  

Preparation of Al_2O_3/ZrO_2 Composite Ceramics by Combustion Synthesis under High Gravity

作　　者：赵忠民[1] 张龙[1] 张靖[1] 潘传增[1] 宋亚林[1] 朱浩[1] 

机构地区：[1]军械工程学院,河北石家庄050003

出　　处：《稀有金属材料与工程》2008年第A01期745-748,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50672131);国防"十一五"预先研究项目(51312010708)

摘　　要：通过在铝热剂中引入ZrO_2与Y_2O_3混合粉末,引发超重力下燃烧合成,制备出大尺寸、高致密度Al_2O_3/ZrO_2(Y_2O_3)自生复合陶瓷板材。XRD,SEM与EDS显示,自生复合陶瓷是以亚微米ZrO_2四方相纤维成排镶嵌其上、生长方向各异的棒状共晶团及Al_2O_3块晶与ZrO_2四方相不规则粒晶分布其上的共晶团边界构成,复合陶瓷的强化不仅归因于分布在棒状共晶团Al_2O_3基体上的残余压应力与小尺寸共晶团边界,更因共晶团Al_2O_3基体上的残余压应力增韧、共晶团边界上的微裂纹增韧及应力诱发相变增韧引起的高断裂韧性所致。Dense composite ceramics were prepared by combustion reaction of ZrO2 and Y2O3, thermit and Al2O3/ZrO2 （Y2O3） plates under condition of high gravity. XRD, SEM and EDS analysis showed that the composite ceramics consisted of random-orientated rod-shaped colonies. The colonies contained a triangular dispersion of ordered submicron t-ZrO2 fibers in the Al2O3 matrix. They were surrounded by a thin inter-colony regions made up of Al2O3 crystals and the coarse and irregular t-ZrO2 particles. The composite ceramics was reinforced from the high compressive residual stresses in the colonies and thin inter-colony regions, and the contributions from the compressive residual stress toughening, microcrack toughening and stress-induced transformation toughening.

关 键 词：Al2O3/ZrO2(Y2O3) 燃烧合成 超重力 共晶生长 强韧化 

分 类 号：TQ174.1[化学工程—陶瓷工业]