陶瓷凝胶再流动结合压滤制备高密度氧化铝素坯  

Fabrication of High-Density Alumina Green Body by Ceramic Gels Re-Fluidising Combined with Filtrating

作　　者：吴晓浪 赵瑾[1,2] 岛井骏藏 毛小建[1,2] 章健[1,2] 王士维 WU Xiaolang;ZHAO Jin;SHIMAI Shunzo;MAO Xiaojian;ZHANG Jian;WANG Shiwei(State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院大学材料科学与光电研究中心,北京100049

出　　处：《硅酸盐通报》2022年第7期2467-2473,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52130207)。

摘　　要：高密度素坯是制备高性能陶瓷的基础,采用再流动结合压滤的方法制备高密度氧化铝素坯,研究了再流动结合压滤对素坯性能的影响。结果表明:脱水收缩1 d的再流动浆料具有更好的可压缩性,随着脱水收缩时间的延长,浆料的可压缩性降低;再流动结合压滤对高固含量浆料的物理力学性能提升效果更明显,与56.0%(体积分数)固含量的浆料直接压滤制备的素坯相比,通过再流动结合压滤制备的素坯相对密度从64.5%提高至65.7%,累积气孔率从0.149 mL/g降低至0.140 mL/g,素坯在1550℃下烧结2 h的烧结收缩率从13.2%降低至12.6%,在1500℃下烧结6 h制备的陶瓷抗弯强度从483 MPa提高至545 MPa。以上结果对大尺寸陶瓷部件制备具有重要意义。High-density green body is the basis to prepare high performance ceramics.Re-fluidising combined with filtrating was applied to prepare high-density alumina green body,and the effect of re-fluidising combined with filtrating on characteristic of green body was investigated.The results show that the re-fluidising slurry after syneresis for 1 d has better compressibility,and the compressibility of the slurry decreases with the extension of syneresis time.Re-fluidising combined with filtrating is an effective method to improve the physical and mechanical properties of slurry,especially for high solid content slurry.Compared with the green body prepared by direct filtration of slurry with 56.0%solid content,the relative density of the green body manufactured by re-fluidising combined with filtrating increases from 64.5%to 65.7%and the cumulative pore volume decreases from 0.149 mL/g to 0.140 mL/g.Correspondingly,the sintering shrinkage ratio of green body decreases from 13.2%to 12.6%when sintering at 1550℃for 2 h,and the flexural strength increases from 483 MPa to 545 MPa after sintering at 1500℃for 6 h.This is important for the preparation of ceramics with large size.

关 键 词：自发凝固成型 压滤 氧化铝 高固含量 高密度 低收缩率 

分 类 号：TQ174[化学工程—陶瓷工业]