Compositions: ceramic – Ceramic compositions – Pore-forming
Patent
1987-05-26
1990-02-13
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Pore-forming
501 81, 501 82, 501 94, 501108, 501109, 501110, 501123, 501125, 501127, 501132, 501133, 501152, 501153, 501154, 264 63, C04B 3806, C04B 3510, C04B 3502
Patent
active
049006983
ABSTRACT:
Porous ceramic greenware comprising finely divided ceramic filler, finely divided metal, and polyolefin controls shrinkage in fired shape. In a preferred embodiment the metal and ceramic filler are bound together with the clean burning polyolefin and a plasticizer. After molding the mixture into the final shape, the plasticizer is removed to introduce porosity into the shaped article. Next the article is heated to decompose the polyolefin which can exit as a gas through the pore openings. Finally, the article is fired to a high temperature to oxidize the metal to metal oxide which becomes sintered with the ceramic filler particles to form a sintered porous article where the oxidized metal bonds the filler particles together in the desired shape.
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Bell Mark L.
Cabic Edward J.
Green Anthony J.
W. R. Grace & Co.,-Conn.
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