Development of fibrous monoliths from mullite, alumina, and zirconia powders

摘要

Fibrous monoliths (FMs) based on mullite combined with Al(sub 2)O(sub 3) and Y(sub 2)O(sub 3)-stabilized ZrO(sub 2) have been produced. These FMs incorporate duplex cells in which compressive residual stresses were engineered into the surfaces of the cells. The residual stresses should increase average cell strength, which may allow them to achieve mechanical properties comparable to those of Si(sub 3)N(sub 4)/BN FMs. The expected residual stresses have been calculated, and data on sintering and thermal expansion have been gathered. Prototype FMs were produced and their microstructure examined.