源自钾基地质聚合物复合材料的多孔陶瓷泡沫：热、机械和结构特性,Materials & Design

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源自钾基地质聚合物复合材料的多孔陶瓷泡沫：热、机械和结构特性
Materials & Design ( IF 7.6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.matdes.2020.109355
Tomáš Kovářík , Jiří Hájek , Michal Pola , David Rieger , Miloš Svoboda , Jan Beneš , Pavol Šutta , Kalim Deshmukh , Věra Jandová

摘要多孔地质聚合物因其生产工艺的灵活性和结构特性的多样性而受到广泛关注。本文首先研究并描述了使用复制技术通过浸渍制造基于地质聚合物混合物的陶瓷泡沫的关键参数。评价地质聚合物混合物粘度对白榴石泡沫陶瓷的总孔隙率、孔径和机械强度的影响。使用与时间相关的粘弹性参数（例如 tan δ、G' 和 G"）研究了 70 °C 下的加速凝固步骤。对于基于地质聚合物混合物的高多孔陶瓷的制造，最佳粘度范围为 9 到 15 Pa。 s 在 100 s−1。差热分析 (DTA) 和 X 射线衍射 (XRD) 表明，在高达 1300 °C 的热暴露期间，主要白榴石相在 1073.5 °C 结晶。已经表明，可以使用复制技术制造具有 76 至 79 vol% 开孔率的陶瓷泡沫。扫描电子显微镜 (SEM) 和 X 射线显微计算机断层扫描 (micro-CT) 已经证实了互连的大孔隙，开放孔径可达 2 毫米。本研究介绍了一组将地质聚合物化学与传统泡沫陶瓷生产相结合的新型材料。扫描电子显微镜 (SEM) 和 X 射线显微计算机断层扫描 (micro-CT) 已经证实了互连的大孔隙，开放孔径可达 2 毫米。本研究介绍了一组将地质聚合物化学与传统泡沫陶瓷生产相结合的新型材料。扫描电子显微镜 (SEM) 和 X 射线显微计算机断层扫描 (micro-CT) 已经证实了互连的大孔隙，开放孔径可达 2 毫米。本研究介绍了一组将地质聚合物化学与传统泡沫陶瓷生产相结合的新型材料。

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Cellular ceramic foam derived from potassium-based geopolymer composite: Thermal, mechanical and structural properties

Abstract Porous geopolymers have drawn widespread attention owing to the flexibility of the production processes and the diversity of their structural properties. This paper first investigates and describes the key parameters for the fabrication of ceramic foam based on a geopolymer mixture by impregnation using the replica technique. The influence of geopolymer mixture viscosity on total porosity, pore size and mechanical strength of leucite ceramic foams is evaluated. The accelerated solidification step at 70 °C was investigated using time-dependent viscoelastic parameters such as tan δ, G' and G". For the fabrication of highly porous ceramics based on the geopolymer mixture, the optimum viscosity ranges between 9 and 15 Pa.s at 100 s−1. Differential thermal analysis (DTA) and X-ray diffraction (XRD) indicated the crystallization of the main leucite phase at 1073.5 °C, during the thermal exposure up to 1300 °C. It has been revealed that ceramic foam with an open porosity of 76 to 79 vol% can be fabricated using a replica technique. Scanning electron microscopy (SEM) and X-ray micro-computed tomography (micro-CT) have confirmed interconnected macroporosity with an open pore size up to 2 mm. This study introduces a novel group of materials combining geopolymer chemistry and traditional production of ceramic foams.

更新日期：2021-01-01

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