1. Design, fabrication, microstructure, and properties of highly porous alumina whisker foam ceramic
- Author
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Hongyu Chen, Salvatore Grasso, Xi Luo, Detian Wan, Chunfeng Hu, Yiwang Bao, Shuai Fu, Qingguo Feng, Baotong Hu, and Juntao Wu
- Subjects
Materials science ,business.industry ,Process Chemistry and Technology ,Sintering ,Microstructure ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Compressive strength ,Whisker ,Thermal insulation ,visual_art ,Materials Chemistry ,Ceramics and Composites ,visual_art.visual_art_medium ,Slurry ,Ceramic ,Composite material ,Porosity ,business - Abstract
In this study, a new type of highly porous ceramic was successfully fabricated from α-Al2O3 whiskers and nano-sized Al2O3 particle slurry by vacuum infiltration with the subsequent annealing in air. It was found that with an increase in the alumina slurry amount or sintering temperature, the porosity of the foam ceramic decreased while its compressive strength increased. The optimal alumina slurry content and sintering temperature were equal to 4 g, and 1350 °C, respectively. The as-synthesised porous foam ceramic exhibited a low density of 0.65 g/cm3, high porosity of 83.51%, high compressive strength of 3.84 MPa, and low thermal conductivity of 1.37 W/m⋅K at room temperature, suggesting its potential applications in high-temperature gas filtration and thermal insulation materials.
- Published
- 2022