Ceramic-coated support for powder metal sintering
AssigneeSaint-Gobain/Norton Industrial Ceramics Corporation
InventorGlenn J. Sundberg
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Abstract
This invention relates to an apparatus comprising: a) a article having a composition selected from the group consisting of graphite, carbon/carbon, carbon/graphite, and mixtures thereof, and b) a ceramic coating thereon, wherein the ceramic coating comprises a material selected from the group consisting of: i) a ceramic having an average thermal expansion coefficient of between 2 and 8.times.10.sup.-6 /.degree. C. between 22.degree. C. and 1200.degree. C. which is also phase stable in the temperature range of 22.degree. C. and 1450.degree. C., and ii) alumina having at least 99% purity.
Claims8
A process comprising the step of:
- (a) sintering a metal-bearing compact in an apparatus comprising:
- (i) an article having a composition selected from the group consisting of graphite, carbon/carbon, carbon/graphite, and mixtures thereof, and
- (ii) a ceramic coating thereon, wherein the ceramic coating comprises magnesia and alumina present in a molar ratio of between 3:1 and 1:3
- at a temperature of at least 1200.degree. C. to form a fully dense component.
Dependencies are inferred from the claim text.