Re-fluidising the aged gel for high-density alumina green body

作     者：Xiaolang WU Jin ZHAO Shunzo SHIMAI Xiaojian MAO Jian ZHANG Shiwei WANG Xiaolang WU;Jin ZHAO;Shunzo SHIMAI;Xiaojian MAO;Jian ZHANG;Shiwei WANG

作者机构：State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2022年第11卷第9期

页      面：1375-1382页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This work was supported by the National Natural Science Foundation of China(No.52130207). 

主　　题：high density green body re-fluidising alumina colloid formation 

摘      要：A green body with a density as high as possible is critical to diminish the crisis of deformation or cracking when large-size parts are sintered.Here,a new method,i.e.,re-fluidising the aged ceramic gel is developed to prepare the high-density green body.Alumina slurry with 56 vol%solid loading and copolymers of isobutylene and maleic anhydride were aged without vaporisation and re-fluidised by non-intrusive shearing after removing the exuded water.The re-fluidised slurry was re-casted.The resultant wet gel was dried and deboned at a low temperature.The relative density of the obtained green body was 64.6%,1.5%higher than that without aging and re-fluidising.The linear sintering shrinkage of the body decreased by 0.7%.The enhanced green density is explained from the viewpoint of the solid loading and the structure of the slurry.