Graded glass/ceramic/glass structures for damage resistant...

Details Graded glass/ceramic/glass structures for damage resistant... Graded glass/ceramic/glass structures for damage resistant...

2007-11-20

2010-12-28

Blackwell, Gwendolyn (Department: 1784)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S426000, C428S428000

Reexamination Certificate

active

07858192

ABSTRACT:
The present invention provides a functionally graded glass/ceramic/glass sandwich system especially useful in damage resistant, ceramic dental and orthopedic prosthesis. The functionally graded glass/substrate/glass composite structure comprises an outer (aesthetic) residual glass layer, a graded glass-ceramic layer, and a dense interior ceramic. The functionally graded glass/substrate/glass composite structure may further comprise a veneer on an exterior surface. The present invention also provides a method for preparing a functionally graded glass/ceramic/glass sandwich system. A powdered glass-ceramic composition or a glass tape is applied to the accessible surfaces of a dense alumina substrate to thereby substantially cover the substrate surfaces. The glass of the composition has a CTE similar to that of the substrate material. The glass-ceramic composition is infiltrated into the dense substrate by heating the assembly to temperatures 50-700° C. below the sintering temperature of the substrate.

REFERENCES:
patent: 6641893 (2003-11-01), Suresh et al.
patent: 2003/0029910 (2003-02-01), Goretta et al.
patent: 2005/0027195 (2005-12-01), Moini et al.
patent: 2006/0191916 (2006-08-01), Stephan et al.

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