Thermal Shock Resistance of Ceramic Foams

Abstract

Thermal shock behavior of a variety of open‐cell ceramic foams was evaluated using infrared heating and forced air cooling. The extent of damage after thermal shock was determined by a nondestructive, dynamic resonance technique. The damage in foams was found to be strongly dependent on cell size and weakly dependent on density. In zirconia‐based foams, damage was found to increase with an increase in zirconia content. A thermal stress resistance parameter R′f was derived to predict the effect of cell size and density on the damage incurred in foams. The experimental results were found to corroborate the predictions fairly well but a better approach was to compare the maximum applied thermal strains with the degree of damage.

Kiln Furnitures

“…5, the data still fall on the same curve as those for 14 % dense material. This is in agreement with Vedula et al [7][8][9], who stated that thermal shock resistance of ceramic foam is not a strong function of density. The projected strength of the higher density YZA at 10 000 cycles is over 700 kPa.…”

“…The struts themselves are much smaller and weaker as a result, and cannot hold up to the stresses generated in the grinding process, so they tend to break instead of being polished. In addition, the thermal shock resis- tance of the foam is reduced as the pore size is decreased, as shown by Vedula et al [7][8][9], and this is an undesirable characteristic. For these cases, experimental reticulated kiln furniture is being tested.…”

“…The foam replication process [10] (see also Chapter 2.1) manufactures cellular ceramics to a selected pore size and geometric shape, and thus makes design work economical and flexible. Molds or forming dies, which tend to be expensive, are not used.…”

Cellular Ceramics in Combustion Environments

“…Porous structures must resist thermo-mechanical stress caused by high temperature gradients, especially during start and modulation of the burner. [18] Depending on the fuel type, fuel/oxidant ratio and the pressure, very different corrosion effects can occur. [19] At high gas velocities and temperatures in combination with aggressive flue gases hot gas corrosion can occur.…”

Thermal shock resistance analysis of a semi-infinite ceramic foam

“…A number of interesting observations were made during the research works aiming at investigating the thermal shock resistance. The thermal shock resistance analysis of ceramic media was mainly focused on the measuring and calculating of Young's modulus and retained strength after thermal shock (Dimitrijevic, Posarac, Majstorovic, Volkov-Husovic, & Matovic, 2009;Ding, Zeng, & Jiang, 2006;Kan, Wei, Meng, & Xu, 2009;Orenstein & Green, 1992;Rendtorff, Garrido, & Aglietti, 2011;Vedula, Green, & Hellman, 1998;You et al, 2005), the length of crack growth (Panda, Kannan, Dubois, Olagnon, & Fantozzi, 2002;Yuan, 2008), and thermal stress resistance parameter (R 0 f ) (Vedula, Green, & Hellman, 1999). It is essential to establish theoretical models for the evaluation of thermal shock resistance behavior of these advanced materials.…”