High‐Temperature Mechanical Properties of Ceramic Materials: II, Beta‐Eucryptite
High‐Temperature Mechanical Properties of Ceramic Materials: II, Beta‐Eucryptite
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DOI：
10.1111/j.1151-2916.1959.tb13597.x
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发表时间：
1959-08
影响因子：
3.9
通讯作者：
E. Bush;F. A. Hummel
中科院分区：
文献类型：
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作者：
E. Bush;F. A. Hummel
烧结β-长辉石（Li2O）产生高应力。由于Al2O2-2SiO2的热膨胀具有极端的各向异性，使得其在烧结温度下冷却。这些应力导致晶体大面积破裂，导致室温下异常低的力学性能值。在再加热过程中，许多裂缝重新组合，导致强度和弹性模量随温度升高而增加。由于额外的破裂和裂缝的扩展，在室温载荷作用下-长晶岩蠕变。提出了计算各向异性晶体烧结单相聚集体内应力的公式。
High stresses arise in sintered β-eucryptite (Li2O. Al2O2-2SiO2) during cooling from the firing temperature because of its extreme anisotropy of thermal expansion. These stresses cause extensive fracturing of the crystals, resulting in abnormally low mechanical property values at room temperature. During reheating, many fractures recombine, causing increase in strength and in elastic modulus with increasing temperature. Beta-eucryptite creeps under load at room temperature because of additional fracturing and the propagation of fractures. Equations are presented for calculating internal stresses in sintered single-phase aggregates of anisotropic crystals.