Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1986-01-03
1989-07-18
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 401, 264 65, 264325, 264332, C04B 3332
Patent
active
048491420
ABSTRACT:
The invention relates to producing relatively flaw free zirconia ceramic shapes requiring little or no matching by superplastic forging of a fully sintered or partially sintered preform. The preform is prepared by providing a starting powder comprising by weight from about 70% to about 100% zirconia and from about 0 to about 30% of stabilizing additives, e.g. commerically available TZ-3Y powder, cold pressing to obtain a preform of green density ranging from about 30% of theoretical density to about 75% of theoretical density and partially or fully sintering at atmospheric pressure, e.g. in argon or air at a temperature ranging from about 900.degree. C. to about 1900.degree. C. The superplastic forging is carried out by isothermally pressing the partially or fully sintered preform into substantially final shape utilizing a temperature and strain rate such that surface cracks do not occur, e.g. utilizing a temperature of 1310.degree. C., a substantially constant displacement rate based on an initial strain rate of 7.times.10.sup.-3 seconds .sup.-1 and open die or closed die processing in a graphite or metal die.
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Panda Prakash C.
Raj Rishi
Seydel Edgar R.
Cornell Research
Derrington James
Jupiter Technologies, Inc.
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