【作者】 汪长安； 陈瑞峰； 刘伟渊； 周立忠； 黄勇；

【Author】 Wang Chang-An~1,Chen Ruifeng~1,Liu Weiyuan~1,Zhou Lizhong~1,Huang Yong~1 (1 State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering,Tsinghua University,Beijing 100084)

【机构】 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室；

【摘要】 凝胶注模工艺通常被用来制备高致密度的陶瓷部件,而在本研究中则介绍了利用该工艺制备轻质（相对密度为8%～40%）氧化铝陶瓷材料的方法。在叔丁醇（TBA）中实现了丙烯酰胺单体聚合,以固相体积分数为5%～15%的Al₂O₃/TBA悬浮体为基础,所获得的超轻质坯体干燥收缩率很小,而且具有较高的强度（1MPa～3MPa）。通过调整初始固相体积分数以及烧结温度,氧化铝陶瓷的气孔率可以在60%～92%内变化,气孔率达到92%的氧化铝烧结体比表面积达到14m²/g,抗压强度超过10MPa。这项工艺方法拓宽了凝胶注模成型工艺的领域,表现出了良好的应用前景。更多还原

【Abstract】 Gel-casting is a conventional technique used to fabricate high density ceramic parts;however,in this work,alumina ceramics with ultra-low density(8%～40%of theoretical density)were successfully fabricated by this method.In this research,polymerization of acrylamide was realized in alumina/t-butyl alcohol(TBA)slurries with solid loading ranging from 5 to 15 vol%.Green bodies with ultra-low density could be dried with very small shrinkage,and relatively high green strengths(1MPa～3MPa)were achieved.By choosing different initial solid loadings and sintering temperatures,the microstructure of sintered porous ceramics could be effectively controlled,with the porosity ranging from 60%to 92%.Sintered alumina showed high open porosity(90%),high specific area(14m~2/g)and high compressive strength(>10MPa).This technique is considered potentially useful in many applications,and introduces a new application field of gel-casting.更多还原