Microstructure and fracture toughness of a spark plasma sintered Al₂O₃-based composite with BaTiO₃ particulates

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• 作者：Rattanachan ; Sirirat ; Miyashita ; Yukio ; Mutoh ; Yoshiharu
• 关键词：Al₂O₃ ; BaTiO₃ ; Composites ; Sintering ; Toughness and toughening
• 刊名：Journal of the European Ceramic Society
• 出版年：2003
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：July, 2003
• 卷：23
• 期：8
• 页码：1269-1276
• 文件大小：787 K

摘要

Dense Al₂O₃-based composites with dispersed BaTiO₃ particulates were fabricated by using spark plasma sintering (SPS) at sintering temperatures between 1100 and 1500 °C with a heating rate of 100 °C/min. High-density of BaTiO₃–Al₂O₃ with various compositions could be achieved by SPS at lower sintering temperatures compared to those by conventional pressure-less sintering (PLS). However, full densification was prevented by the onset of abnormal grain growth in Al₂O₃–BaTiO₃ composites sintered by SPS. It was found that SPS process could accelerate the abnormal grain growth due to the activation and purification of particle surface. The addition of BaTiO₃ in Al₂O₃ matrix improved fracture toughness of the composites fabricated by both SPS and PLS. The highest fracture toughness of 6.04 MPa.m^1/2 was achieved in the composite sintered by SPS process with 5 mol%BaTiO₃, while that of the monolithic Al₂O₃ was about 4.0 MPa.m^1/2.