Abstract
Freeze-casting (FC) is an innovative technique for developing porous ceramics with distinctive pore structures. The homogeneous alumina slurry with increasing solid concentration (50, 60, 70, and 80 wt.%) in water prepared by ball milling has been frozen and subsequently sublimed to produce green bodies, which are further sintered to fabricate lamellar-structured porous ceramics. As the solid content increases from 50 to 80 wt.%, the slurry viscosity increases, while porosity decreases from 70 to 30%. Microstructural investigations of porous ceramics revealed alternating layers of open porosity and a dense lamellar structure. The pores formed during FC were infiltrated with Poly (methyl methacrylate) (PMMA) polymer and composites were characterised by density, compressive strength and hardness measurement. The findings demonstrate that FC composite structural characteristics may be specifically engineered, making them the perfect choice for applications that is needed for high porosity at low or medium load-bearing capacity.
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Acknowledgements
The authors would like to express their heartfelt appreciation to The Director, ARDE, Pune, and Vice-Chancellor, DIAT, Pune, for their assistance with this project. In addition, the DRDO's financial assistance as an SRF fellowship is appreciated.
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Dixit, P., Rawal, B., Panda, H.S. et al. Freeze-Casted Porous Lamellar-Structured Alumina Ceramics and Polymer-Infiltrated Composites: Synergistic Enhancement of Structural Properties. Trans Indian Inst Met 76, 1211–1219 (2023). https://doi.org/10.1007/s12666-022-02831-y
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DOI: https://doi.org/10.1007/s12666-022-02831-y