Nickel aluminosilicate glass-ceramics
AssigneeCorning Incorporated
InventorsGeorge H. Beall, Joseph E. Pierson
Life of this patent
Estimating the term…
Abstract
This invention is directed to the production of thermally crystallizable glasses which can be crystallized in situ via heat treatment into glass-ceramic articles containing a nickel spinelloid as the predominant crystal phase. The glasses consist essentially, in weight percent, of 40-60% SiO.sub.2, 10-35% Al.sub.2 O.sub.3, 5-35% NiO, 0-20% MgO, and 0-15% total TiO.sub.2 and/or ZrO.sub.2. The preferred glasses contain at least 2% MgO.
Claims6
A glass-ceramic article containing a nickel spinelloid as the predominant crystal phase, said glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of 40-60% SiO.sub.2, 10-35% Al.sub.2 O.sub.3, 5-35% NiO, 0-20% MgO, and 0-15% total TiO.sub.2 and/or ZrO.sub.2.
A method for making a glass-ceramic article containing a nickel spinelloid as the predominant crystal phase comprising the steps of:
- (a) melting a batch for a glass consisting essentially, expressed in terms of weight percent on the oxide basis, of 40-60% SiO.sub.2, 10-35% Al.sub.2 O.sub.3, 5-35% NiO, 0-20% MgO, and 0-15% total TiO.sub.2 and/or ZrO.sub.2 ;
- (b) cooling said melt to a temperature at least below the transformation range of said glass and simultaneously forming a glass body therefrom of a desired configuration;
- (c) exposing said glass body to a temperature between about 800.degree.-850.degree. C. for a time sufficient to generate the development of nuclei therein;
- (d) exposing said nucleated glass body to a temperature between about 850.degree.-1200.degree. C. for a time sufficient to cause the growth of nickel spinelloid crystals in situ on said nuclei to form a glass-ceramic body;
- and thereafter
- (e) cooling said glass-ceramic body to room temperature.
Dependencies are inferred from the claim text.