Tapes of TiO₂‐MnO‐doped alumina (d‐Al₂O₃) and pure alumina (Al₂O₃) were shaped via tape casting. Laminates with three different layer numbers and respective thicknesses were produced and sintered at 1200°C. The microstructure and mechanical behavior of laminates were investigated and compared to the respective monolithic references (d‐Al₂O₃ and Al₂O₃). The use of dopants in alumina decreased the initial sintering temperature, leading to higher densification at 1200°C (~98% theoretical density (TD)) when compared to Al₂O₃ (~73% TD). The higher density was reflected in a higher Young's modulus and hardness for doped alumina. A region of diffusion of dopants in pure alumina layers was observed along the interface with doped layers. The mechanical strength of d‐Al₂O₃ samples sintered at 1200°C was not statistically different from Al₂O₃ samples sintered at 1350°C. The strength of laminates composed of doped layers with undoped, porous interlayers did not change. Nevertheless, as the thickness of these porous interlayers increases, a loss of strength was observed. Monolithic references showed constant values of fracture toughness (K_IC), ~2 MPa·m^1/2, and linear crack path. On the other hand, K_IC of laminates increases when the crack propagates from weak Al₂O₃ layers to dense d‐Al₂O₃ layers.

中文翻译：

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掺杂TiO2-MnO的氧化铝/氧化铝层压板的微观结构和力学行为

TiO ₂ -MnO掺杂的氧化铝（d-Al ₂ O ₃）和纯氧化铝（Al ₂ O ₃）的带材通过流延成型。生产具有三种不同层数和各自厚度的层压板，并在1200℃下烧结。研究了层压板的微观结构和力学行为，并将其与相应的整体式参考材料（d-Al ₂ O ₃和Al ₂ O ₃）进行了比较。与Al ₂ O ₃相比，在氧化铝中使用掺杂剂降低了初始烧结温度，从而导致在1200°C下具有更高的致密化（〜98％理论密度（TD））。（〜73％TD）。较高的密度反映出掺杂氧化铝的较高杨氏模量和硬度。沿着与掺杂层的界面观察到纯氧化铝层中掺杂剂的扩散区域。在1200°C下烧结的d-Al ₂ O ₃样品的机械强度与在1350°C下烧结的Al ₂ O ₃样品在统计学上没有差异。由具有未掺杂的多孔中间层的掺杂层组成的层压板的强度没有变化。然而，随着这些多孔中间层的厚度增加，观察到强度损失。整体参考显示出恒定的断裂韧性（K _IC）值，〜2 MPa·m ^1/2和线性裂纹路径。另一方面，K当裂纹从弱的Al ₂ O ₃层扩展到致密的d-Al ₂ O ₃层时，层压板的_IC会增加。