Glass-ceramics containing NZP-type crystals
AssigneeCorning Glass Works
InventorBruce G. Aitken
Life of this patent
Estimating the term…
Abstract
This invention is directed to the production of glass-ceramic articles wherein a NZP-type crystals constitutes essentially the sole crystal phase. The inventive articles are prepared by heat treating precursor glass articles with compositions having the stoichiometry characterized by the formula A.sub.0-4 B.sub.2 (XO.sub.4).sub.3 wherein A represents at least one monovalent or divalent cation selected from the group consisting of Zn, Mg, Mn, Fe, Co, Ni, Cu, Ca, Cd, Sr, Ba, Tb, Li, Na, and K, B represents at least one trivalent, tetravalent, or pentavalent cation selected from the group consisting of Fe, Ti, Cr, Zr, Nb, Mo, In, Sn, Y, and a RE, and X represents P cations which may be partially replaced by Si cations, and the cation ratio B:X is essentially 2:3.
Claims2
A glass-ceramic article exhibiting a linear coefficient of thermal expansion of about -20 to +65.times.10.sup.-7 /.degree.C. wherein a crystal having the stoichiometry characterized by the formula A.sub.0-4 B.sub.2 (XO.sub.4).sub.3 constitutes essentially the sole crystal phase, wherein a represents a monovalent or divalent cation selected from the group consisting of Zn, Mg, Mn, Fe, Co, Ni, Cu, Ca, Cd, Sr, Ba, Pb, Li, Na, and K, B represents at least one trivalent, tetravalent, or pentavalent cation selected from the group consisting of Fe, Ti, Cr, Zr, Nb, Mo, In, Sn, Y, and an RE, and X represents P cations which may be partially replaced by Si cations, and the cation ratio B:X is essentially 2:3.
Dependencies are inferred from the claim text.