Influence of Sintering Temperature on Fracture Toughness for High Toughness Alumina Ceramics
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摘要: 针对一种通过球磨方法向初始原料氢氧化铝中添加晶种、采用热压方式烧结获得的高韧性Al2O3陶瓷材料,采用三点弯曲试件测定了不同烧结温度下的成组断裂韧度值,研究了烧结温度对该材料断裂韧性的影响规律,得出了断裂韧度随烧结温度增加有先升后降趋势,因而存在最佳烧结温度的结论.同时,通过不同烧结温度下瓷体表面显微结构的观察,分析了上述影响规律产生的机理.Abstract: The fracture toughness of hot-pressed alumina ceramics at different sintering temperatures was examined. The high fracture toughness alumina samples were made from low-temperature-calcined α-alumina powder prepared from aluminum hydroxide by seeding of wet grinding abrasion powder. As the sintering temperature increased, the fracture toughness increased to an optimal temperature and then decreased. The fracture toughness is increased by the formation of elongated grain structure and decreased by abnormal grain growth.
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Key words:
- ceramics /
- sintering /
- fracture toughness
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