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Isotropy in large-size Al_2O_3/Y_3Al_5O_(12) eutectic ceramic grown by Horizontal Directional Solidification method

机译:水平定向凝固法生长大尺寸Al_2O_3 / Y_3Al_5O_(12)共晶陶瓷的各向同性

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摘要

The eutectic Al_2O_3/Y_3Al_5O_(12) with the dimension of 150 mm × 90 mm × 20 mm was grown in vacuum by Horizontal Directional Solidification (HDS) method. The thermal and mechanical properties were investigated from room temperature to 1273 K, on specimens whose longitudinal directions were parallel (L-specimen) and perpendicular (T-specimen) to the solidification direction. Even though new preferred orientations of (1 1 2 3) Al_2Cu and (5 3 2) Y_3A1_5O_(12) emerged in L-specimen, neither in T-specimen, isotropic properties of residual stresses in Al_2Cu phase, thermal expansion coefficients, flexural and compressive strengths appeared. For HDS-Al_2O_3/Y_3Al_5O_(12), the reasons of improved Vickers hardness were discussed.
机译:通过水平定向凝固(HDS)方法在真空中生长尺寸为150mm×90mm×20mm的共晶Al_2O_3 / Y_3Al_5O_(12)。研究了从室温到1273 K的热和机械性能,这些试样的纵向与凝固方向平行(L形)和垂直(T形)。即使在L型试样中出现了(1 1 2 3)Al_2Cu和(5 3 2)Y_3A1_5O_(12)的新的优选取向,在T型试样中,Al_2Cu相中残余应力的各向同性性质,热膨胀系数,挠曲强度和出现抗压强度。对于HDS-Al_2O_3 / Y_3Al_5O_(12),讨论了维氏硬度提高的原因。

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