两次离心挂浆工艺制备网眼多孔陶瓷  

Development of Reticulated Porous Ceramics by Two-step Centrifuging Processing

作　　者：蒲锡鹏[1,2] 邱发贵[1] 刘学建[1] 黄莉萍[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]聊城大学材料科学与工程学院

出　　处：《无机材料学报》2005年第6期1431-1437,共7页Journal of Inorganic Materials

基　　金：国家863高技术发展计划(863-3-333030)上海市基础研究项目(04DZ14002)

摘　　要：以具有三维网状结构和贯通气孔的聚氨酯泡沫体为载体,采用两次离心挂浆工艺制备了高气孔率、无堵孔且结构均匀可控的氮化硅网眼多孔陶瓷.借助TG-DSC分析了泡沫体的热分解过程,确定了排胶工艺.借助流变测量和光学显微镜观察了挂浆工艺及浆料粘度对泡沫体挂浆量和多孔结构的影响,并对制品材料的微观结构和性能进行了表征.结果表明,与传统辊压工艺相比,采用两次离心挂浆工艺后,改善了多孔结构的均匀性,显著提高了材料强度,为高强度、结构可控、网眼多孔陶瓷的制备提供了一个有效途径.Silicon nitride reticulated porous ceramics with controlled structure were fabricated by a two-step centrifuging processing, using polyurethane sponge as the template. According to the TG-DSC analysis of the template, the pyrolysis schedule was decided. Effects of centrifuging processing and viscosity on the loading content of slurry on the sponge and macrostructure of porous ceramics were studied. The structure and bond strength of the reticulated porous ceramics were also reported. Compared with the roll-press processing, the reticulated porous ceramics fabricated by the two-step centrifuging processing have higher slurry loading, more uniform structure and higher bending strength.

关 键 词：网眼多孔陶瓷 涂覆 离心工艺 浆料 

分 类 号：TQ174[化学工程—陶瓷工业]