Effect of Al(2)TiO(5) Content and Sintering Temperature on the Microstructure and Residual Stress of Al(2)O(3)-Al(2)TiO(5) Ceramic Composites.
Effect of Al(2)TiO(5) Content and Sintering Temperature on the Microstructure and Residual Stress of Al(2)O(3)-Al(2)TiO(5) Ceramic Composites.
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Al2TiO5含量和烧结温度对Al2O3-Al2TiO5陶瓷复合材料微观结构和残余应力的影响
DOI：
10.3390/ma14247624
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发表时间：
2021-12-11
期刊：
影响因子：
--
通讯作者：
Yao P
中科院分区：
文献类型：
--
作者：
Fan K;Jiang W;Ruiz-Hervias J;Baudín C;Feng W;Zhou H;Bueno S;Yao P
具有不同Al 2 TiO 5含量（10和40体积%）的一系列Al 2 O3-Al 2 TiO 5陶瓷复合材料研究了在不同烧结温度（1450和1550 °C）下制备的SiO2陶瓷。通过扫描电子显微镜、X射线衍射、飞行时间中子衍射和Rietveld分析研究了这些复合材料的微观结构、微晶结构和全厚度残余应力。晶格参数的变化和个别峰位移进行了分析，以计算在Al 2 O3基质和Al 2 TiO 5颗粒的平均相应力，以及峰值特定的残余应力为不同的hkl反射的每个阶段。结果表明，Al 2 TiO 5含量和烧结温度对复合材料的显微结构有影响。此外，随着Al 2 TiO 5晶粒尺寸的增加，发生微裂纹，导致弯曲强度降低。1450和1550 °C的烧结温度确保了Al 2 TiO 5在Al 2 O3-Al 2 TiO 5复合材料的反应烧结和随后的冷却过程中的完全形成。AT在1550 °C烧结时发生部分分解。在Al 2 TiO 5颗粒的平均相残余应力是拉伸的，和那些在Al 2 O3基质中的压缩，几乎平坦的通过厚度的残余应力分布在散装样品。由于热膨胀各向异性在个别阶段，峰值特定的残余应力值的符号和大小高度依赖于个人hkl反射。平均相和峰值特定的残余应力被发现是依赖于Al 2 TiO 5的含量和烧结温度的Al 2 O3-Al 2 TiO 5复合材料，因为不同的发展显微组织可以产生应力释放微裂纹。本工作是有益的发展Al 2 O3-Al 2 TiO 5复合材料的微观结构和残余应力，这是至关重要的，以实现所需的热和机械性能的控制。
A series of Al2O3–Al2TiO5 ceramic composites with different Al2TiO5 contents (10 and 40 vol.%) fabricated at different sintering temperatures (1450 and 1550 °C) was studied in the present work. The microstructure, crystallite structure, and through-thickness residual stress of these composites were investigated by scanning electron microscopy, X-ray diffraction, time-of-flight neutron diffraction, and Rietveld analysis. Lattice parameter variations and individual peak shifts were analyzed to calculate the mean phase stresses in the Al2O3 matrix and Al2TiO5 particulates as well as the peak-specific residual stresses for different hkl reflections of each phase. The results showed that the microstructure of the composites was affected by the Al2TiO5 content and sintering temperature. Moreover, as the Al2TiO5 grain size increased, microcracking occurred, resulting in decreased flexure strength. The sintering temperatures at 1450 and 1550 °C ensured the complete formation of Al2TiO5 during the reaction sintering and the subsequent cooling of Al2O3–Al2TiO5 composites. Some decomposition of AT occurred at the sintering temperature of 1550 °C. The mean phase residual stresses in Al2TiO5 particulates are tensile, and those in the Al2O3 matrix are compressive, with virtually flat through-thickness residual stress profiles in bulk samples. Owing to the thermal expansion anisotropy in the individual phase, the sign and magnitude of peak-specific residual stress values highly depend on individual hkl reflection. Both mean phase and peak-specific residual stresses were found to be dependent on the Al2TiO5 content and sintering temperature of Al2O3–Al2TiO5 composites, since the different developed microstructures can produce stress-relief microcracks. The present work is beneficial for developing Al2O3–Al2TiO5 composites with controlled microstructure and residual stress, which are crucial for achieving the desired thermal and mechanical properties.
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影响因子：
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影响因子：
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作者：
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影响因子：
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作者：
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