Manufacture of Refractory Multilayer Composites with Optimised Thermal and Chemical Properties Via the Tape Casting Process
Using different grain size distributions, the packing density could be controlled and thus, dense and porous tapes could be generated with variable properties. For processing, conventional Al2O3, ZrO2 and MgO powders have been used. Residual stresses were incorporated in multilayer structures via differences in shrinkage or thermal expansion behaviour in order to improve the thermal shock resistance. In addition, a glass layer has been introduced between ceramic layers, which softens at higher temperatures, and therefore deflects or stops cracks. Finally, a green tape was joined with a traditional refractory brick in order to improve the surface of conventional refractories. The influence of these attempts on thermal shock behaviour has been demonstrated for sintered planar tape laminates.