Using a gelation-freezing method, diatomite-derived porous silica ceramics with high porosities up to 90% were fabricated. Diatomite particles contain large numbers of meso- and micropores, intrinsically reducing the thermal conductivity. In this study, thermal conductivity of the sintered specimens was measured. Results indicate that ceramics had a low thermal conductivity due to their very high porosity....
In this study, the effect of freeze casting method to fabricate thermal insulators is analyzed. Gelation freezing was done to create unique honeycomb-like microstructures with high porosity. A thermal analyzer was used to measure the thermal conductivity of the insulators with the transient plane source (TPS) method. Results showed that the insulators exhibited very low thermal conductivities....
The purpose of this study was to produce high porosity silica thermal insulators through gelation-freezing. The thermal conductivities of the insulators in relation to porosity and microstructure were measured by a thermal constant analyzer based on the transient plane source (TPS) method. The thermal conductivities of the S1 and S10 samples remained fairly constant despite temperature changes, and were mainly affected by solid and gas conduction....
