Corning Incorporated

William E Horsfall

Ronald Leroy Stewart

David J Kerko

Thomas G Havens

Michael David Harris

The present invention relates to glass, glass-ceramic materials, lamp reflectors and processes for making them. The glass material has a composition, by weight of the total composition, comprising 56-67% SiO; 9-22% AlO; 3.4-3.8% LiO; 1.8-2.6% ZnO; 1.5-2.5% MgO; 3.3-5% TiO; 0-2.5% ZrO; 1.5-3% BO; 0-6% PO; 0-0.6% F; less than 500 ppm Fe; and components resulting from effective amount of at least one refining agent. The glass-ceramic material of the present invention contains &#x3b2;-spodumene solid solution as the predominant crystalline phase, and can be obtained by proper thermal treatment of the glass-ceramic material.

Lamp reflector substrate, glass, glass-ceramic materials and process for making the same

The present invention relates to glass, glass-ceramic materials, lamp reflectors and processes for making them. The glass material has a composition, by weight of the total composition, comprising 56&#x2013;67% SiO; 9&#x2013;22% AlO; 3.4&#x2013;3.8% LiO; 1.8&#x2013;2.6% ZnO; 1.5&#x2013;2.5% MgO; 3.3&#x2013;5% TiO; 0&#x2013;2.5% ZrO; 1.5&#x2013;3% BO; 0&#x2013;6% PO; 0&#x2013;0.6% F; less than 500 ppm Fe; and components resulting from effective amount of at least one refining agent. The glass-ceramic material of the present invention contains &#x3b2;-spodumene solid solution as the predominant crystalline phase, and can be obtained by proper thermal treatment of the glass-ceramic material.

The present invention relates to glass, glass-ceramic materials, lamp reflectors and processes for making them. The glass material has a composition, by weight of the total composition, comprising 56&#x2013;67% SiO; 9&#x2013;22% AlO; 3.4&#x2013;3.8% LiO; 1.8&#x2013;2.6% ZnO; 1.5&#x2013;2.5% MgO; 3.3&#x2013;5% TiO; 0&#x2013;2.5% ZrO; 1.5&#x2013;3% BO; 0&#x2013;6% PO; 0&#x2013;0.6% F; less than 500 ppm Fe; and components resulting from effective amount of at least one refining agent. The glass-ceramic material of the present invention contains &#x3b2;-quartz solid solution as the predominant crystalline phase, and can be obtained by proper thermal treatment of the glass-ceramic material. The glass-ceramic material is particularly suitable for heat-resistant lamp reflectors which require a high surface smoothness Ra of lower than 75 nm, a low CTE between 25 and 300&#xb0; C. of less than 10&#xd7;10K, and IR transmission at about 1050 nm of over 80% at a thickness of 3 mm.

A glass polarizer and a method of making the polarizer, the polarizer being produced from an R O&mdash;Al O &mdash;B O &mdash;SiO glass containing limited amounts of ZrO and TiO , and having a silver halide liquidus temperature and a rutile liquidus temperature, both temperatures being not over 995&deg; C.

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Corning, NY, United States of America

William E Horsfall