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Abstract Fundamental requirements of ultra-high temperature ceramic (UHTC) thermal insulators are excellent thermal stability above 1800 °C, good thermal insulation capability, and high mechanical reliability. We report foam-gelcasting-freeze drying method to… Click to show full abstract
Abstract Fundamental requirements of ultra-high temperature ceramic (UHTC) thermal insulators are excellent thermal stability above 1800 °C, good thermal insulation capability, and high mechanical reliability. We report foam-gelcasting-freeze drying method to fabricate porous multicomponent (Hf1/3Ta1/3Nb1/3)C UHTC with superhigh porosity (90.0-94.0%). The as-prepared samples show low density (0.70–1.17 g/cm3), moderately high compressive strength (0.34–1.34 MPa), low thermal conductivity (0.089–0.098 W/(m•K)), and excellent ultra-high temperature stability (low shrinkage of
Journal Title: Materialia
Year Published: 2021
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