叔丁醇基凝胶注模成型制备氧化铝多孔陶瓷

摘要

Porous alumina ceramics were prepared using Al203 micropowder as starting material and tert-butyl alcohol (TBA) as solvent by get-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.%以微米级Al2O3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Al2O3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Al2O3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1.0 μm逐渐减小至0.78 μm,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.