Modified cordierite precursors

Details Modified cordierite precursors Modified cordierite precursors

1992-11-20

1995-04-25

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501153, 264 65, C04B 3518

Patent

active

054098700

ABSTRACT:
Cordierite-containing articles are produced by a method comprising the steps of providing raw materials including including alumina-yielding ingredients, magnesia-yielding ingredients, and silica-yielding ingredients, suitable to form an analytical batch composition by weight on an oxide basis of 9-20 weight percent MgO, 30-50 weight percent Al.sub.2 O.sub.3, and 41-56.5 weight percent SiO.sub.2. The raw materials include talc having a BET surface area of no greater than about 4.0 m.sup.2 /g, and uncalcined clay having an average particle size of no greater than about 2.0 .mu.m. The raw materials are blended with an effective amount of vehicle and forming aids to form a plastic mixture. The plastic mixture is anisostatically formed into a green body and dried. The dried green body is fired at a temperature and for a time effective to form a cordierite/containing ceramic article. The cordierite-containing articles exhibit a coefficient of thermal expansion of not greater than about 4.0.times.10.sup.-7 /.degree.C. and transverse I ratios of not less than about 0.85. The method of the present invention is particularly useful in forming cordierite honeycomb structures used as catalyst supports for automobiles or as particulate filters for the exhaust fluids of diesel engines.

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