Method of preparing crack-free monolithic polycrystalline...

Details Method of preparing crack-free monolithic polycrystalline... Method of preparing crack-free monolithic polycrystalline...

C - Chemistry, Metallurgy

04

B

261/33, 261/40

C04B 33/00 (2006.01) B01J 37/00 (2006.01) C04B 35/195 (2006.01)

Patent

CA 1059160

METHOD OF PREPARING CRACK-FREE MONOLITHIC POLYCRYSTALLINE CORDIERITE SUBSTRATES Abstract of the Disclosure Cracking of large monolithic cordierite segments and in particular monolithic honeycombed substrates having a matrix of thin walls forming a multiplicity of open ended cells extending from one end of the substrate to the other end is reduced or eliminated by limiting the amount of raw clay used in formulating the clay-talc-alumina raw material batch. The raw clay may be eliminated entirely but is preferably at least 10% of the whole batch and not more than 31% of the whole batch with the balance of the clay constituent to the raw material batch being calcined clay. The raw material batch is preferably formulated to yield at least 90% cordierite phase upon reaction during sintering.

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