摘要
基于燃烧合成理论,在铝热剂中添加ZrO2(4Y)粉末,采用离心技术制备出了高强度、高韧性的Al2O3/YSZ共晶系陶瓷内衬复合管,并研究了离心力、共晶成分对陶瓷内衬显微结构、力学性能及强韧化本质的影响。实验发现,在离心力大于200GPa条件下,熔体以远离平衡态下的共晶方式生长,形成以Al2O3为基体、具有共晶结构的棒晶组织;且存在于棒晶上的ZrO2四方相纤维直径已达到纳微米尺度,使陶瓷基体得以强化和韧化,从而保证Al2O3/YSZ共晶系陶瓷内衬复合管具有较高的综合力学性能。
The Al2O3/YSZ eutectic composite ceramics-lined pipes have been prepared by combustion synthesis. By adding ZrO2 （4Y） to the thermit, the influences of centrifugal force and eutectic composition on the microstructure, mechanical properties, strengthening and toughening of ceramics lining are researched. The growth of melt was based on eutectic transformation under high degree of under-cooling at centrifugal force above 200 GPa. The linings were comprised of rod-shaped Al2O3 matrix eutectic grains. The diameters of tetragonal lattice ZrO2 fiber in rod-shaped grains were on nano-micron scale, causing the strengthening and toughening of ceramics to be promoted. As a result, the Al2O3,rysz eutectic composite ceramics-lined pipes had high comprehensive mechanical properties
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期211-214,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金项目(50672131)
关键词
燃烧合成
Al2O3/YSZ共晶陶瓷
共晶生长
强韧化
combustion synthesis
Al2O3/YSZ eutectic composite ceramics
eutectic growth
strengthening and toughening
