Pigmented ceramic piece

Details Pigmented ceramic piece Pigmented ceramic piece

2011-03-01

2011-03-01

Speer, Timothy M (Department: 1784)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

C428S469000, C428S472000

Reexamination Certificate

active

07897253

ABSTRACT:
The invention relates to a piece comprised in part or in full of a pigmented ceramic in which the pigment is comprised of nanoparticles based on a metal from column IB of the periodic table of the elements or of an alkaline metal, or an alloy of both, coated with a layer of silica, the silica being crystalline silica, particularly cristobalite or tridymite. The ceramic is preferably zirconia or alumina. The nanoparticle silica is crystallized, for example, by a thermal treatment in air or under inert gas at temperatures of between 900° C. and 1400° C. The piece is made by sintering a nanoparticle/ceramic mixture in air or under inert gas at temperatures of between 900° C. and 1250° C.

REFERENCES:
patent: 6074754 (2000-06-01), Jacobsen et al.
patent: 07410172 (1996-11-01), None
patent: WO 03/076521 (2003-09-01), None
F. Garcia Santamaria et al. “Synthetic opals based on silica coated gold nanoparticles” Langmuir, vol. 18, Feb. 5, 2002, pp. 4519-4522.
Kobayashi Y et al.: “Silica coating of silver nanoparticles using a modified Stober method” Journal of Colloid and Interface Science, Academic Press, New York, NY, US, vol. 283, No. 2, Mar. 15, 2005, pp. 392-396.
Partial European Search Report dated Nov. 17, 2006, issued in corresponding European Application No. 06 40 5325.

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