This work discusses the reinforcement effect of elongated CeAl₁₁O₁₈ phase on multifunctional Al₂O₃/Ti composites by adding CeO₂ to inhibit interfacial reaction and strengthen interface for inducing optimized performances. For this purpose, Al₂O₃/Ti composite with different contents of CeO₂ was fabricated and the microstructure, mechanical and electrical properties were studied. Results indicated that after CeO₂ was added, elongated CeAl₁₁O₁₈ phase was formed within these composites. Owing to inhibited interfacial reaction between Al₂O₃ and Ti, Ti content was increased and compositions of composites were calculated using Rietveld method based on X‐ray diffraction patterns. Attributed to the strengthening and toughening effects of CeAl₁₁O₁₈ phase, 2 mol% CeO₂ added composite showed the highest flexural strength and fracture toughness of 576 MPa and 5.15 MPa·m^1/2, which increased by 21% and 20% compared to Al₂O₃/Ti composite without CeO₂ addition. In this case, crack bridging by both Ti and CeAl₁₁O₁₈ particles was the major toughening mechanism and the additional fracture toughness caused by CeAl₁₁O₁₈ toughening effect reached a maximum. The role (crack bridging or particle pull‐out mechanism) of CeAl₁₁O₁₈ in toughening Al₂O₃/Ti composites depended on the aspect ratio of these elongated particles, which was directly related to CeO₂ content. Because of the inhibition of interfacial reaction and the increase in Ti content, excellent electrical resistivity of composites after CeO₂ addition was maintained in spite of the formation of insulated CeAl₁₁O₁₈ phase. All samples showed relatively low electrical resistivity of ~10⁻³ Ωcm.

中文翻译：

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CeAl11O18通过添加CeO2在增强Al2O3 / Ti复合材料中的作用

这项工作讨论了延长CeAl ₁₁ O _18相对多功能Al ₂ O ₃ / Ti复合材料的增强作用，方法是添加CeO ₂抑制界面反应并增强界面以诱导最佳性能。为此，制备了不同含量的CeO _2的Al ₂ O ₃ / Ti复合材料，并对其组织，力学性能和电性能进行了研究。结果表明，添加CeO ₂后，在这些复合材料中形成了细长的CeAl ₁₁ O ₁₈相。由于抑制了Al ₂之间的界面反应O ₃和Ti的含量增加，并且使用Rietveld方法基于X射线衍射图计算复合材料的组成。归因于CeAl ₁₁ O ₁₈相的强化和增韧作用，添加2 mol％CeO _2的复合材料显示出最高的弯曲强度和断裂韧性，分别为576 MPa和5.15 MPa·m ^1/2，与之相比分别增加了21％和20％。不含CeO _2的Al ₂ O ₃ / Ti复合材料。在这种情况下，Ti和CeAl ₁₁ O ₁₈颗粒的裂纹桥接是主要的增韧机理，而CeAl ₁₁引起的附加断裂韧性O _18的增韧效果达到最大。CeAl ₁₁ O ₁₈在增韧Al ₂ O ₃ / Ti复合材料中的作用（裂纹桥接或拉出颗粒的机理）取决于这些细长颗粒的长径比，这与CeO ₂含量直接相关。由于抑制了界面反应和Ti含量的增加，尽管形成了绝缘的CeAl ₁₁ O ₁₈相，但在添加CeO ₂之后复合材料仍保持了优异的电阻率。所有样品显示出〜10的相对低的电阻率^-3  Ωcm以下。