初始浆料中固相含量对莫来石多孔陶瓷显微结构和性能的影响  

Effects of Solid Loading in Initial Slurry on Microstructure and Properties of Porous Mullite Ceramics

作　　者：李玉涛[1] 汪长安[1] 赵晨辰[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2011年第S1期540-543,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(90816019);"863"计划(2007AA03Z435);"973"计划(2006CB605207-2)

摘　　要：以叔丁醇为溶剂,采用凝胶注模工艺制备莫来石多孔陶瓷,研究不同固相含量对莫来石多孔陶瓷的显微结构、气孔率、气孔尺寸及分布、压缩强度和室温热导率的影响。实验结果表明,莫来石多孔陶瓷的气孔率和开气孔率分别在54.9%~61.2%和50.8~55.5%;气孔分布均匀且呈单峰分布,气孔孔径为2.34~3.52μm;在相同的烧结制度下,固相含量升高,莫来石多孔陶瓷的收缩率变小,气孔率降低,压缩强度和热导率明显升高,最高强度达59.5MPa,最低热导率为0.408W/m·K。Porous mullite ceramics were prepared by gel-casting process with tert-butyl alcohol (TBA) as solvent. The effects of solid loading in initial slurry on microstructure, porosity, pore size distribution, compressive strength and thermal conductivity at room temperature were investigated. The results show that the porosity and open porosity of the porous mullite ceramics are in the range of 54.9%-61.2% and 50.8%-55.5%, respectively; pore size distribution curves show uniform and single-peak distribution and the mean pore size is in the range of 2.34-3.52 μm; with the increase of solid loading, the shrinkage of the mullite green body during sintering is decreased, the porosity decreased, but the compressive strength and the thermal conductivity of the mullite ceramics are increased obviously. The maximum compressive strength reaches 59.5 MPa and the lowest thermal conductivity at room temperature reaches 0.408 W/m·K.

关 键 词：莫来石 多孔陶瓷 气孔结构 压缩强度 热导率 

分 类 号：TQ174.1[化学工程—陶瓷工业]