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二元凝胶法制备Al2O3多孔陶瓷及其表面强化层
作者:      郭露村 
单位:(南京工业大学材料科学与工程学院 南京 211816) 
关键词:多孔陶瓷 发泡注凝法 凝胶体系 表面强化层 
分类号:TQ174
出版年,卷(期):页码:2019,47(9):0-0
DOI:
摘要:

 采用发泡注凝法制备Al2O3多孔陶瓷,研究了丙烯酰胺与明胶所组成的二元凝胶体系对陶瓷浆料黏度、发泡效果、坯体强度及陶瓷显微结构的影响,并对烧结陶瓷体的显气孔率、强度等进行了表征。结果表明:丙烯酰胺具有辅助分散作用,可降低明胶对浆料黏度的影响并改善浆料发泡效果;采用二元凝胶体系可制备具有均匀孔径分布的可适当机械加工陶瓷坯体;经1 600 ℃烧结2 h,可获得显气孔率为70%~90%的Al2O3多孔陶瓷,其中显气孔率最高为90.8%的多孔陶瓷其抗压强度高达3.3 MPa。在此基础上,对其进行了表面强化的研究。通过在其表面流延一层高强度多孔薄层,不仅使材料整体抗弯强度从6.4 MPa提高到10.8 MPa,而且可以有效降低高温气流对材料表面的烧蚀程度。

基金项目:
江苏高校优势学科建设工程资助项目(PAPD)。
作者简介:
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