Bimodal porous ceramics with high strength have been fabricated by conventional powder metallurgy utilizing artificially cultured diatom frustules (DFs). The effect of sintering temperature on thermal behaviors, phase transition, and pore structures features of DFs‐based porous ceramics is investigated between 800 and 1200°C. The phase evolution of DFs powders is investigated with thermal analysis (DIL and DSC‐TG). Phase transition behaviors analyzed with XRD, Raman, and FT‐IR spectra confirm the transformation of quartz into cristobalite phases occurs under 1050°C. Sintering under 950°C could bind DFs powders tightly into high strength porous ceramics while maintain the multilayer pore structures simultaneously, having porosity of 56.4%, compressive strength of 15.0 MPa and surface area of 50.9 m²/g, respectively. Slit‐shaped microstructures and mesopores (2‐50 nm) are observed in DFs‐based porous ceramics sintered under 1050°C. Collapse and blockage of pore structures as well as partial fusion of DFs particles happened at the temperature of 1100°C, indicating the presence of diminished multilayers and particle agglomeration.

中文翻译：

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人工培养的硅藻壳制成的多孔陶瓷的烧结行为和性能

具有高强度的双峰多孔陶瓷已经通过利用人工培养的硅藻壳（DFs）的常规粉末冶金法来制造。在800至1200°C的温度范围内研究了烧结温度对DFs基多孔陶瓷的热行为，相变和孔结构特征的影响。通过热分析（DIL和DSC-TG）研究了DFs粉末的相变。用XRD，拉曼和FT‐IR光谱分析的相变行为证实了在1050°C的温度下石英向方石英相的转变。在950°C的温度下烧结可以将DFs粉末紧密结合到高强度多孔陶瓷中，同时保持多层孔隙结构，孔隙率为56.4％，抗压强度为15.0 MPa，表面积为50.9 m ²/ g。在1050°C下烧结的DFs基多孔陶瓷中观察到狭缝状的微结构和中孔（2-50 nm）。孔结构的塌陷和阻塞以及DFs颗粒的部分融合在1100°C的温度下发生，表明存在减少的多层结构和颗粒附聚。