Method for manufacture of porous refractory articles

Details Method for manufacture of porous refractory articles Method for manufacture of porous refractory articles

1988-12-22

1989-11-07

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 84, 501 84, 501 80, C04B 3800, C04B 4191

Patent

active

048789470

ABSTRACT:
The alkali metal content of unfired porous ceramic shapes is substantially reduced by treatment with water to remove excess alkali and treatment with a dilute aqueous solution of an ammonium salt, preferably ammonium chloride, to exchange ammonium ion for remaining alkali metal ion, such that, upon firing, porous ceramic articles are produced having improved stability in high temperature and/or temperature-cycled environments.

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