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US 4,407,967 AGranted
Method for producing spheroidal ceramics
AssigneeFrenchtown American Corp.
InventorDaniel W. Luks
Life of this patent
Estimating the term…
Abstract
Spray dried spheroidal ceramic particles are fired at about 100.degree. to 150.degree. (C.) less than the optimum firing temperature, so as to achieve about 95% of theoretical density while avoiding more than nominal co-sintering (e.g. sticking together). The fired spheroidal ceramics are useful as such in a variety of applications, and can also be pressed into shapes and re-fired to form porous ceramic filter elements of closely controlled permeability.
Claims8
The method of producing spheroidal ceramic particles comprising:
- preparing a ceramic slip including particles of a particular composition and known curing temperature;
- forming green, spheroidal ceramic particles by spray drying said slip;
- firing said green particles at about 100.degree. to 150.degree. C. below the optimum curing temperature to produce spheroidal particles of less than maximum bulk density and to avoid any substantial sintering together of said particles;
- and
- agitating the fired particles to separate particles that have sintered together during firing into individual spheroidal particles.
2 more elements
The method of producing porous ceramic bodies comprising:
- preparing a ceramic slip including particles of a particular composition and known curing temperature;
- forming green, spheroidal ceramic particles by spray drying said slip;
- firing said green particles at about 100.degree. to 150.degree. C., below the optimum curcing temperature to produce particles of less than maximum bulk density and to avoid any substantial sintering together of said particles;
- and
- agitating the fired particles to separate particles that have sintered together during firing into individual spheroidal particles;
- classifying the separated, fired particles into size fractions;
- mixing a fraction of the fired particles with a binder material;
- forming the particle-binder mixture into a body of desired shape;
- and
- firing the shaped body at the optimum curing temperature to produce a porous ceramic body.
7 more elements
Dependencies are inferred from the claim text.