Sealing materials and glasses
First Claim
1. A fusion sealing material composed of a tin-phosphorus oxyfluoride glass having a low transition temperature and a mill addition selected from the group consisting of Invar, molybdenum, tungsten, lead orthophosphate, magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium, and a crystallized phosphate glass composed essentially of P2 O5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
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Accused Products
Abstract
Mill additions are disclosed which lower the CTE of, and are compatible with, tin-phosphorus oxyfluoride glasses. The sealing materials provide fusion-type seals having a CTE not over about 110×10-7 /°C. and a sealing temperature not over about 350° C.
Also disclosed is a family of glass compositions in the tin-phosphorus oxyfluoride system that exhibit very low glass transition temperatures and coefficients of thermal expansion not over about 160×10-7/°C. (25°-150° C.). In addition to the four basic elements, the glasses contain up to 11% Nb, and may additionally contain up to 10%, taken individually or in combination, of V, Fe and/or Mo to further decrease the Tg and CTE values.
92 Citations
45 Claims
- 1. A fusion sealing material composed of a tin-phosphorus oxyfluoride glass having a low transition temperature and a mill addition selected from the group consisting of Invar, molybdenum, tungsten, lead orthophosphate, magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium, and a crystallized phosphate glass composed essentially of P2 O5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
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21. A fusion seal composed of a tin-phosphorus oxyfluoride glass having a sealing temperature not over about 350°
- C. and a mill addition that is relatively inert to the oxyfluoride glass and that is dispersed therein, the mill addition being selected from the group composed of Invar, molybdenum, tungsten, lead orthophosphate magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium and a crystallized phosphate glass composed essentially of P2 O5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
- View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A glass comprising, in weight percent on an elemental basis as calculated from the batch 20-85% Sn, 2-20% P, up to 11% Nb, 3-20% O, 10-36% F, the total Sn+P+Nb+O+F being at least 75%, the glass having a Tg not over 250°
- C. and a CTE not over 150×
10-7 /+C. - View Dependent Claims (42, 43, 44, 45)
- C. and a CTE not over 150×
Specification