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冷冻注凝制备氮化硅陶瓷基耐高温复合材料

DOI: 10.14062/j.issn.0454-5648.2015.06.03

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Abstract:

采用硅溶胶冷冻胶凝陶瓷成型技术制备Si3N4/BAS陶瓷复合材料,分析了硅溶胶冷冻胶凝技术原理和特点,并对Si3N4/BAS陶瓷复合材料性能及微观形貌进行了研究。结果表明该成型方法所获得的坯体干燥无变形无开裂,收缩率小于1%;陶瓷烧结体密度为2.9g/cm3时,烧结体抗弯强度、弯曲弹性模量、断裂韧性以及洛氏硬度分别为350MPa、193GPa、6.2MPa·m1/2和58。该成型技术实现了陶瓷界多年来对先进陶瓷高效、低成本、原位近净尺寸成型的追求。

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