摘要
陶瓷材料具有高硬度、耐磨、耐腐蚀及耐高温等特点，但其脆性问题始终困绕着人们。近年来的研究发现，当陶瓷材料的晶粒变得很细小（处在纳米量级）时，其强度和断裂韧性均有很大程度提高。本文研究了纳米Ａｌ＿２Ｏ＿３粉的制备及其成型、烧结，研究了用纳米粉Ａｌ_２Ｏ_３烧制成的纳米晶Ａｌ_２Ｏ_３基复合陶瓷的断裂韧性与其晶粒尺寸间的关系。通过研究认为，细化陶瓷材料的晶粒也是解决其脆性，提高其断裂韧性的一条有效途径。
It is recognized that ceramics offer advantages over metals in engineering use, such ashigh hardness, wear resistance, chemical resistivity and high melting temperature. The last researchshows that thinning crystalline grain can greatly increase fracture toughness of ceramics. In this paper,we studied the praparation, shaping and sintering of nanometer-size Al_2O_3 powder and discussed theinfluence of crystalline grain size on fracture toughness of Al_2O_3 matrix nanocrystalline ceramics.
关键词
烧结
断裂韧性
复合陶瓷
纳米晶
纳米
Nanometer-size Al_2O_3 Shaping and sintering,Fracture toughness
