US5089446A
Expired / Lapsed
US
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Sealing materials and glasses
Assignee: Corning Inc
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Filing: 1990-10-09
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Granted: 1992-02-18
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Expires: 2010-10-09
Abstract
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.
Inventors
- 👤 Lauren K. Cornelius
- 👤 Gaylord L. Francis
- 👤 Paul A. Tick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:06
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C3/00; C03C3/12; C03C3/23; C03C3/247; C03C8/14; C03C8/18
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
94 words
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 P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 2
Dependent Claim
94 words
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 P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 3
Dependent Claim
38 words
A sealing material in accordance with claim 1 wherein the tin-phosphorus oxyfluoride glass composition, in weight percent on an elemental basis, comprises 20-85% Sn, 2-20% P, 3-20% O and 10-36% F, the Sn+P+O+F total being at least 75%.
Claim 4
Dependent Claim
19 words
A sealing material in accordance with claim 1 wherein the tin-phosphorus oxyfluoride glass composition includes up to 11% Nb.
Claim 5
Dependent Claim
28 words
A sealing material in accordance with claim 1 wherein the tin-phosphorus oxyfluoride glass composition includes up to 10%, taken individually or in combination, of Mo, Fe and/or V.
Claim 6
Dependent Claim
15 words
A sealing material in accordance with claim 1 wherein the selected mill addition is Invar.
Claim 7
Dependent Claim
16 words
A sealing material in accordance with claim 1 wherein the selected mill addition is magnesium pyrophosphate.
Claim 8
Dependent Claim
44 words
A sealing material in accordance with claim 1 wherein the selected mill addition is magnesium pyrophosphate with at least a portion of the magnesium cations replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 9
Dependent Claim
18 words
A sealing material in accordance with claim 7 wherein the replacing cation in the magnesium pyrophosphate is cobalt.
Claim 10
Dependent Claim
18 words
A sealing material in accordance with claim 7 wherein the replacing cation in the magnesium pyrophosphate is zinc.
Claim 11
Dependent Claim
60 words
A sealing material in accordance with claim 1 wherein the selected mill addition is composed of at least two different pyrophosphate crystalline materials with at least one being a magnesium pyrophosphate with at least a portion of the magnesium cations being replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 12
Dependent Claim
17 words
A sealing material in accordance with claim 10 wherein one of the crystalline materials is magnesium pyrophosphate.
Claim 13
Dependent Claim
95 words
A sealing material in accordance with claim 1 wherein the selected mill addition is a phosphate selected from the group composed of 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 P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium and the material additionally contains Invar particles.
Claim 14
Dependent Claim
23 words
A sealing material in accordance with claim 1 wherein the mill addition constitutes not more than about 20% by volume of the material.
Claim 15
Dependent Claim
41 words
A sealing material in accordance with claim 1 wherein the material contains an additional additive selected from the oxides of lead, bismuth, antimony, zinc, cadmium and stannous tin in an amount at least sufficient to reduce bubble formation in the seal.
Claim 16
Dependent Claim
15 words
A sealing material in accordance with claim 14 wherein the selected oxide is stannous oxide.
Claim 17
Dependent Claim
44 words
A sealing material in accordance with claim 1 wherein the selected mill addition is a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 18
Dependent Claim
34 words
A sealing material in accordance with claim 16 wherein the mill addition is a crystallized glass composed essentially of MgO and P 2 O 5 in about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 19
Dependent Claim
60 words
A sealing material in accordance with claim 17 wherein the crystallized glass composition further includes at least one oxide selected from the group composed of cobalt, arsenic, zinc, aluminum, iron and zirconium, and the molar ratio of the total of such selected oxide(s) plus MgO to the P 2 O 5 is about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 20
Dependent Claim
14 words
A sealing material in accordance with claim 18 wherein the selected oxide is cobalt.
Claim 21
Dependent Claim
14 words
A sealing material in accordance with claim 18 wherein the selected oxide is zinc.
Claim 22
Dependent Claim
114 words
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 P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 23
Dependent Claim
114 words
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 P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 24
Dependent Claim
31 words
A fusion seal in accordance with claim 21 wherein the oxyfluoride sealing glass comprises 20-85% Sn, 2-20% P, 3-20 % O and 10-36% F, the total Sn+P+O+F being at least 75%.
Claim 25
Dependent Claim
18 words
A fusion seal in accordance with claim 21 wherein the oxyfluoride glass composition contains up to 11% Nb.
Claim 26
Dependent Claim
27 words
A fusion seal in accordance with claim 21 wherein the oxyfluoride glass composition contains up to 10%, taken individually or in combination, of Mo, Fe and/or V.
Claim 27
Dependent Claim
22 words
A fusion seal in accordance with claim 21 wherein the mill addition constitutes not more than 20% by volume of the seal.
Claim 28
Dependent Claim
15 words
A fusion seal in accordance with claim 21 wherein the selected mill addition is Invar.
Claim 29
Dependent Claim
16 words
A fusion seal in accordance with claim 21 wherein the selected mill addition is magnesium pyrophosphate.
Claim 30
Dependent Claim
44 words
A fusion seal in accordance with claim 21 wherein the selected mill addition is magnesium pyrophosphate with at least a portion of the magnesium cations replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 31
Dependent Claim
18 words
A fusion seal in accordance with claim 28 wherein the replacing cation in the magnesium pyrophosphate is cobalt.
Claim 32
Dependent Claim
18 words
A fusion seal in accordance with claim 28 wherein the replacing cation in the magnesium pyrophosphate is zinc.
Claim 33
Dependent Claim
60 words
A fusion seal in accordance with claim 21 wherein the selected mill addition is composed of at least two different pyrophosphate crystalline materials with at least one being a magnesium pyrophosphate with at least a portion of the magnesium cations being replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 34
Dependent Claim
17 words
A fusion seal in accordance with claim 31 wherein one of the crystalline materials is magnesium pyrophosphate.
Claim 35
Dependent Claim
95 words
A fusion seal in accordance with claim 21 wherein the selected mill addition is a phosphate selected from the group composed of 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 P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium and the material additionally contains Invar particles.
Claim 36
Dependent Claim
42 words
A fusion seal in accordance with claim 21 wherein the mill addition further contains an oxide selected from the oxides of lead, bismuth, antimony, zinc, cadmium and stannous tin in an amount at least sufficient to reduce bubble formation in the seal.
Claim 37
Dependent Claim
15 words
A fusion seal in accordance with claim 34 wherein the selected oxide is stannous oxide.
Claim 38
Dependent Claim
44 words
A fusion seal in accordance with claim 21 wherein the selected mill addition is a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 39
Dependent Claim
34 words
A fusion seal in accordance with claim 36 wherein the mill addition is a crystallized glass composed essentially of MgO and P 2 O 5 in about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 40
Dependent Claim
60 words
A fusion seal in accordance with claim 37 wherein the crystallized glass composition additionally contains at least one oxide selected from the group composed of cobalt, arsenic, zinc, aluminum, iron and zirconium, and the molar ratio of the total of such selected oxide(s) plus MgO to the P 2 O 5 is about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 41
Dependent Claim
14 words
A fusion seal in accordance with claim 38 wherein the selected oxide is cobalt.
Claim 42
Dependent Claim
14 words
A fusion seal in accordance with claim 38 wherein the selected oxide is zinc.
Claim 43
Dependent Claim
51 words
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.
Claim 44
Dependent Claim
51 words
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.
Claim 45
Dependent Claim
25 words
A glass in accordance with claim 41 wherein the composition additionally contains up to 10%, taken individually or in combination, of Mo, Fe and/or V.
Claim 46
Dependent Claim
79 words
A glass in acordance with claim 41 wherein the composition additionally contains up to 20% total of cation modifiers selected in the indicated proportions from the group consisting of up to 25% Pb, up to 12% Zr, up to 3% Ti, up to 1% Ca, up to 3% Ba, up to 2% Zn, up to 10% Fe, the Ti+Ca+Ba+Zn+Fe being up to 10% , up to 4% Al, up to 1% Si and up to up to 3% Na+Li+K.
Claim 47
Dependent Claim
19 words
A glass in accordance with claim 41 comprising 50-75% Sn, 2-11% P, 2-10% Nb, 4-13% O, and 14-25% F.
Claim 48
Dependent Claim
23 words
A glass in accordance with claim 41 wherein the composition additionally contains 10%, taken individually or in combination, of Mo, Fe and/or V.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |