Composites of Al₂O₃/ZrO₂ (containing 25, 50, and 75 vol% ZrO₂) were prepared by mixing Al₂O₃ and ZrO₂ suspensions. The microstructural control via two‐step sintering (TSS) was the main objective of this work. For this purpose, different sintering curves were constructed, aiming to achieve the best temperature combination for the sintering steps that provides higher density and finer microstructure. The results were compared with single‐step sintering (SSS). Furthermore, microhardness and fracture toughness were measured for the best TSS specimens under each composition. The results showed that the high densities were obtained, and the reduction of grain size was greater than 40% for two‐step sintered specimens, compared to SSS ones. Consequently, microhardness values increased. However, fracture toughness values remained unchanged.

中文翻译：

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两步烧结Al2O3 / ZrO2复合材料的组织和力学性能

通过将Al ₂ O ₃和ZrO ₂混合来制备Al ₂ O ₃ / ZrO ₂（包含25、50和75体积％的ZrO ₂）的复合物。暂停。通过两步烧结（TSS）进行微观结构控制是这项工作的主要目标。为此目的，构建了不同的烧结曲线，旨在为烧结步骤实现最佳温度组合，从而提供更高的密度和更精细的微观结构。将结果与单步烧结（SSS）进行了比较。此外，针对每种成分下的最佳TSS样品，测量了显微硬度和断裂韧性。结果表明，与SSS相比，两步烧结试样的密度更高，晶粒尺寸减小幅度大于40％。因此，显微硬度值增加。但是，断裂韧性值保持不变。