Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1978-04-10
1981-06-23
Parrish, John
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
106 733, 264 65, C04B 3558
Patent
active
042750253
ABSTRACT:
A method of making articles of Group IVb metal diboride powder by cold pressing and sintering is disclosed. Group IVb metal diboride powder is pressed in a mold substantially below sintering temperatures to form a cold pressed green piece having substantially uniform compaction over its major surfaces. The piece is enclosed but not confined in a thermally conductive receptacle which has been pre-fired to remove volatile impurities, and the enclosed piece sintered without the simultaneous application of pressure. The powder and green piece are maintained under inert atmosphere before and during sintering. The method is particularly useful for the production of flat plates, where warpage during sintering may otherwise be a problem.
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Parrish John
PPG Industries Inc.
Stein Irwin M.
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