Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1987-09-02
1989-04-11
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 88, 501 89, 501 92, 501 95, 264 60, 264 65, 264 66, 264 67, 4272481, 427249, 4272557, C04B 3556, C04B 3562, C04B 3564, C04B 3580
Patent
active
048206636
ABSTRACT:
A method of manufacturing a shaped ceramic article by hot isostatic pressing comprising the following steps: (a) forming a compact of sinterable ceramic compositions, (b) applying a coating to the compact by vapor deposition of a ceramic composition that does not become vitreous before or during the subsequent isostatic pressing step, and (c) heating and isostatically pressing the coated compacts in an atmosphere that reacts with the coating and/or the compact at pressing temperatures and pressures to cause the compact to approach theoretical density. The method is suitable for forming a fired ceramic compact having a whisker loading in excess of about 12.5 volume percent with substantially isotropic properties due to a substantially random orientation of the whiskers.
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Evans & Charles, "Fracture Toughness Determination by Indentation", J. American Ceramic Society, vol. 59, No. 7-8, pp. 371 and 372.
Billman Elizabeth R.
Mehrotra Pankaj K.
Swiokla Joyce L.
Brunsman David M.
Dixon Jr. William R.
Kennametal Inc.
Prizzi John J.
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