Tough cordierite glass-ceramics

Details Tough cordierite glass-ceramics Tough cordierite glass-ceramics

2006-05-31

2008-12-16

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S005000, C501S010000

Reexamination Certificate

active

07465687

ABSTRACT:
An internally nucleated, toughened cordierite glass-ceramic is disclosed. The cordierite glass-ceramic has good oxidation resistance and fracture toughness and coefficient of thermal expansion rivaling that of silicon nitride. The glass-ceramic may be cast as a liquid. Annealing produces a material of high crystallinity combining high hardness, high Young's modulus, good thermal stability, high strength, low density and good dielectric properties. The glass-ceramic comprises interlocking crystalline phases dominated by cordierite and a second phase having an elongated or acicular structure. A third phase may comprise a crystalline ceramic that promotes acicularity of the second phase. The third phase is preferably capable of twinning.

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patent: 6171988 (2001-01-01), Fasano et al.
patent: 6300263 (2001-10-01), Merkel
patent: 6495480 (2002-12-01), Goto

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