摘要
在 Al2 O3中加入一定量的苏州土和 Mg O,使 Al2 O3陶瓷在 14 5 0～ 15 5 0℃的温度范围内烧结。利用 XRD、SEM等手段进行测试 ,结果表明在烧成过程中苏州土、Mg O与 Al2 O3反应生成低共熔相和一定量的尖晶石小晶粒 ,填充在 Al2 O3晶粒之间 ,有效地降低 Al2 O3陶瓷的烧结温度 ;控制苏州土和 Mg O的外加量 ,能够调节 Al2 O3晶界上形成的尖晶石量和液相量 ,可有效抑制 Al2 O3晶粒的长大 ,使 Al2 O3陶瓷晶粒细小且分布均匀 ,有利于陶瓷显微结构的改善。Al2 O3晶粒的均匀化、细晶化 ,能够显著提高 Al2 O3陶瓷的强度 ,降低其热膨胀系数 ,从而提高 Al2 O3陶瓷的热稳定性。
The Al_2O_3 ceramics,together with Suzhou clay and MgO was sintered at the temperature between 1 450~1 550 ℃. Using XRD,SEM and other tests,the results showed the Suzhou clay and MgO can react with the Al_2O_3 and create some thin spinal grains filling in the Al_2O_3 grains boundary,and thus reducing the sintering temperature effectively. By adjusting the content of Suzhou clay and MgO,the growth of the Al_2O_3 grains can be controlled well,which can make the Al_2O_3 grains to grow and distribute uniformly. Thus,it improved the microstructure of the ceramic. At the same time,the strength of Al_2O_3 ceramic can be enhanced and its thermal expansion coefficient can be reduced evidently,resulting in the improvement of the thermal stability of the Al_2O_3 ceramic.
出处
《武汉理工大学学报》
CAS
CSCD
2004年第5期25-28,共4页
Journal of Wuhan University of Technology
基金
武汉科技大学高温陶瓷与耐火材料湖北省重点实验室开放基金 (G0 2 0 4 )
关键词
蓄热体
AL2O3陶瓷
烧结性
抗热震性
regenerative body
Al_2O_3 ceramics
sintering performance
thermal shock resistance
