Temperature dependence of mechanical properties of aluminum titanate ceramics
Temperature dependence of mechanical properties of aluminum titanate ceramics
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DOI：
10.1016/j.jeurceramsoc.2006.04.182
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发表时间：
2007-01-01
影响因子：
5.7
通讯作者：
Awaji, Hideo
中科院分区：
文献类型：
--
作者：
Chen, Chun-Hong;Awaji, Hideo
钛酸铝 (Al2TiO5: AT) 是一种合成陶瓷材料，在许多结构应用中具有潜在的应用价值。严重限制多晶 AT 机械性能的一个关键特征是相当大的晶间微裂纹，这是由于烧结后冷却过程中单个晶粒的大热各向异性而发生的。本研究讨论了机械性能的温度依赖性，并提出了对微观结构形态的观察。随着温度的升高，断裂强度和断裂韧性都显着增加。临界正面加工区 (FPZ) 尺寸是根据机械性能估算的。在第一次热处理中，随着温度的升高，观察到 FPZ 尺寸减小。这些现象是根据AT陶瓷断裂表面的应力重新分布和独特的微观特征来解释的。实验结果表明，进一步的热处理提高了断裂强度，降低了断裂韧性，而对FPZ尺寸几乎没有影响。 (c) 2006 Elsevier Ltd. 保留所有权利。
Aluminum titanate (Al2TiO5: AT) is a synthetic ceramic material of potential interest for many structural applications. A critical feature, which greatly limits the mechanical properties of polycrystalline AT, is the considerable intergranular microcracking, which occurs due to the large thermal anisotropy of individual grains during cooling after sintering. This study discusses the temperature dependence of mechanical properties, and presents observations on the microstructure morphology. Both the fracture strength and fracture toughness increased considerably with increasing temperature. The critical frontal process zone (FPZ) size was estimated from the mechanical properties. A decrease in FPZ size was observed with increasing temperature in the first thermal treatment. These phenomena were explained on the basis of the stress redistribution and unique microscopic feature on the fracture surface of AT ceramics. The experimental results revealed that further thermal treatment increased the fracture strength and reduced the fracture toughness, while it had almost no effect on the FPZ size. (c) 2006 Elsevier Ltd. All rights reserved.