机械振动对燃烧合成Al_2O_3/ZrO_2(3Y)自增韧复合陶瓷的影响  

Influences of Mechanical Vibration on Al_2O_3/ZrO_2(3Y) Self-Toughening Composite Ceramics Prepared by Combustion Synthesis

作　　者：赵忠民[1] 张龙[1] 杨润泽[1] 许宝才[1] 

机构地区：[1]军械工程学院先进材料研究所,河北石家庄050003

出　　处：《稀有金属材料与工程》2007年第A01期724-726,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目资助(50672131)

摘　　要：基于燃烧合成制备Al2O3/ZrO2(3Y)自增韧复合陶瓷,研究了机械振动工艺对陶瓷显微结构与力学性能的影响。经研究发现,施以机械振动并相应提高振频,可通过引入惯性力,提高陶瓷熔体实际温度,促进陶瓷致密;并且,施以机械振动并相应提高振频,不仅因增大陶瓷熔体过冷度与凝固速率、细化棒晶组织并降低棒晶内纳微米纤维尺寸,使陶瓷得以强化,而且又可通过细化棒晶组织并增大其长径比,增强棒晶裂纹桥接与拔出效应,使材料韧性又得以提升。The mechanical vibration has been utilized to fabricate Al2O3/ZrO2 （3Y）, and the influences of mechanical vibration on the microstructures and mechanical properties of Al2O3/ZrO2 （3Y） have been investigated. The results show that mechanical vibration with increasing frequency can promote ceramic densification by introducing the inertia force to increase actual temperature of the melts. Meanwhile, mechanical vibration with increasing frequency can not only make the composite ceramics reinforced by increasing under-cooling degree and solidification rate of the ceramic melts to refine rod-shaped grains and reduce the size of nano-micron fibers in rod-shaped grains, but also make the enhance toughening contribution from composite ceramics toughened by refining rod-shaped grains and increasing their aspect ratios to crack-bridging and pull-out of rod-shaped grains.

关 键 词：燃烧合成 快速凝固 Al2O3/ZrO2(Y2O3)共晶复合陶瓷 纳米晶结构 机械振动 强韧化 

分 类 号：TQ174.758.2[化学工程—陶瓷工业]