Preparation and characterization of highly porous Yb2SiO5 ceramics using water-based freeze-casting
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This study introduces a new, highly porous Yb2SiO5 ceramic prepared using a water-based freeze-casting technique. The prepared porous Yb2SiO5 ceramic had ultra-high porosity (82–86 %) and tailored pore structures. The effects of sintering temperature on the pore structure, thermal conductivity, and mechanical properties of these ceramics were investigated. The sample with 15 vol% solid content prepared at 1450 °C had ultra-low linear shrinkage (4.85 %), ultra-high porosity (83.95 %), high compressive strength (2.15 MPa), and low thermal conductivity (0.121 W/m K). In addition, this sample showed a relatively high compressive strength (1.15 MPa) at 1500 °C. These results highlight the potential application of highly porous Yb2SiO5 ceramics as thermal insulator materials in ultra-high temperature environments.
KeywordsPorous ceramics Freeze casting Ultra-high porosity Mechanical properties
This work was supported by the National Natural Science Foundation of China (11227801 and 11472038) and the Fundamental Research Fund for the Central Universities (Grant No. 2014RC047).
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