Drying process to produce crack-free bodies

Details Drying process to produce crack-free bodies Drying process to produce crack-free bodies

1994-09-12

1996-07-23

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Producing or treating inorganic material, not as pigments,...

264430, 264 63, 264 66, 264234, 26417712, 26421112, 264104, 264105, B29C 7100, B29C 4788

Patent

active

055386814

ABSTRACT:
A method for making a dried crack-free body involves forming a wet mixture of powder which can be ceramic, glass-ceramic, glass, molecular sieve, activated carbon, and combinations thereof, plasticizing organic binder which can be cellulose ethers, and/or their derivatives, and vehicle of water and at least one of the additional components of oleic acid, linoleic acid, linotenic acid, ricinoleic acid, or their derivatives, the vehicle content being at least about 35% by weight based on the powder content. The mixture is formed into a green body and dried. If the powder is conducting, the drying is done by a controlled humidity drying procedure which involves i) heating the green body at a temperature of about 35.degree. C. to 90.degree. C. at a relative humidity of about 90% to 95% for a time of about 1 to 7 hours, and thereafter ii) heating the green body at a temperature at about 88.degree. C. to 95.degree. C. at a relative humidity at about 90% to 95% for about 1 to 7 hours. If the powder is non-conducting the drying is done by either microwave or dielectric drying.

REFERENCES:
patent: 3885977 (1975-05-01), Lachman et al.
patent: 5273692 (1993-12-01), Numoto et al.
patent: 5328657 (1994-07-01), Kamel et al.
patent: 5413753 (1995-05-01), Zahr
patent: 5447694 (1995-09-01), Swaroop et al.

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