叔丁醇基凝胶注模成型制备氧化铝多孔陶瓷  

Preparation of porous alumina ceramics by TBA based gel-casting process

作　　者：徐鲲濠[1] 孙阳[1] 黄勇[2] 孙加林[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]清华大学材料科学与工程系新型陶瓷及精细工艺国家重点实验室,北京100084

出　　处：《耐火材料》2011年第2期93-95,99,共4页Refractories

基　　金：国家重点研究发展计划(973计划)(2006CB605207-2)

摘　　要：以微米级A l2O3粉料为原料,叔丁醇为溶剂,采用凝胶注模成型工艺制备了氧化铝多孔陶瓷,并研究了A l2O3浆料的固相体积分数(分别为8%、10%、13%和15%)对1 500℃保温2 h烧后氧化铝多孔陶瓷的气孔率、气孔孔径分布、耐压强度、热导率和显微结构的影响。结果表明:当A l2O3浆料的固相体积分数从8%增加到15%时,氧化铝多孔陶瓷烧结体的总气孔率从71.2%逐渐降低至61.2%,气孔平均孔径从1.0μm逐渐减小至0.78μm,耐压强度从16.0 MPa逐渐增大至45.6 MPa,而热导率从1.03 W.(m.K)-1逐渐增大至1.83W.(m.K)-1。Porous alumina ceramics were prepared using Al2O3 micropowder as starting material and tert-butyl alcohol（TBA） as solvent by gel-casting process.The effects of solid volume percents（8%,10%,13%,and 15%）in Al2O3 slurry on the porosity,pore size distribution,compressive strength,thermal conductivity,and microstructure of porous alumina ceramics fired at 1 500 ℃ for 2 h were investigated.The results show that when solid volume percent increases from 8% to 15%,total porosity of porous alumina ceramics decreases from 71.2% to 61.2%,the mean pore size decreases from 1.0 μm to 0.78 μm,compressive strengths increases from 16.0 MPa to 45.6 MPa,and thermal conductivity increases from 1.03 W·（m·K）-1 to 1.83 W·（m·K）-1.

关 键 词：凝胶注模成型 Al2O3多孔陶瓷 气孔率 孔径分布 耐压强度 热导率 

分 类 号：TQ174.62[化学工程—陶瓷工业]