Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1992-12-24
1994-02-22
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 86, 264338, 249115, C04B 3328
Patent
active
052884430
ABSTRACT:
A mold release agent is provided which is compatible for use with slip casting molds formed from alumina, which are more durable than conventional gypsum molds. The preferred mold release agent is a suspension whose suspended solid matter is water-insoluble, organic, and composed of fine natural or synthetic powders or fibers. The mold release agent forms a layer of particles and/or fibers on the mold cavity surface which promotes the ease by which the cast article can be removed from the alumina mold. The mold release agent is readily burned out during subsequent firing or sintering operations, so as not to leave an undesirable residue in the surface of the fired or sintered ceramic article. Furthermore, the mold release agent does not have an undesirable effect on the microstructure of the as-cast or sintered ceramic article, nor does its use result in any detectible surface or internal cracks in the as-cast or sintered ceramic article.
REFERENCES:
patent: 2498149 (1950-02-01), Bower
patent: 3641229 (1972-02-01), Lawrence et al.
patent: 5156856 (1992-10-01), Iwasaki
James et al., Paper Pulp Linings for Mold Release In Ceramic Bulletin, pp. 712-713, vol. 42, No. 11 (1963).
Coffin, "A Permeable Ceramic Mold Material", Ceramic Bulletin, vol. 45, No. 11 (1966) pp. 1014-1016.
Cowan, "Slip Casting", Treatise on Materials Science and Technology, vol. 9, Ceramic Fabrication Processes (1976), pp. 153-159.
Richerson, "Modern Ceramic Engineering", pp. 193-197.
Derrington James
General Motors Corporation
Grove George A.
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