Low CTE-low porosity cordierite bodies and method of making same

Details Low CTE-low porosity cordierite bodies and method of making same Low CTE-low porosity cordierite bodies and method of making same

1998-11-20

2000-06-20

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501118, 501119, C04B 35195

Patent

active

060777966

ABSTRACT:
Low expansion, low porosity cordierite bodies having a CTE at 25-800.degree. C. of <4.times.10-7C-1 and total porosity of <20%, or CTE of >4.times.10-7C-1 but <9.times.10-7C-1 and total porosity of <12%, or a CTE of >9.times.10-7C-1 but <15.times.10-7C-1 and total porosity of <10%. They are produced by selecting cordierite-forming raw materials in specific combinations of talc, spinel, kaolin, calcined kaolin, Al203-forming material, MgO-forming materials, and silica, in various particle size combinations. The raw materials are intimately blended with an effective amount of vehicle and forming aids and plastically shaped into a green body that is dried and fired at a temperature of about 1370.degree. C. to 1435.degree. C. Firing schedules vary according the raw material combination.

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