US4004936A
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Low temperature sealed glass compositions and process for their preparation
Assignee: International Business Machines Corp
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Filing: 1976-05-19
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Granted: 1977-01-25
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Expires: 1996-05-19
Abstract
Abstract Low temperature, vitreous-crystalline seal glass compositions and a process for their preparation are described. The composition consists essentially of the following constituents in percent by weight: ______________________________________ Percent by Weight ______________________________________ PbO 63.5-64.6 B 2 O 3 13.0-13.9 Bi 2 O 3 1.2-1.5 ZnO 11.4-11.9 SiO 2 2.4-2.8 Al 2 O 3 0.8-1.0 Cu 2 O 4.3-5.8 ______________________________________
Inventors
- 👤 Jimmie Lee Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:35
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/0745; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A low temperature vitreous/crystalline seal glass composition consisting essentially of the following constituents in percent by weight: ______________________________________
Percent by Weight
______________________________________
PbO 63.5-64.6
B.sub.2 O.sub.3
13.0-13.9
Bi.sub.2 O.sub.3
1.2-1.5
ZnO 11.4-11.9
SiO.sub.2 2.4-2.8
Al.sub.2 O.sub.3
0.8-1.0
Cu.sub.2 O 4.3-5.8
______________________________________ said composition having a softening temperature of from about 400° to 408° C, a glass transition temperature of from about 370° to 375° C, a strain temperature of from about 309° to 326° C, and annealing temperature of from about 332° to 342° C; and a thermal coefficient of expansion of from about 83 × 10 - 7 /° C to 86.5 × 10 - 7 /° C.
Claim 2
Dependent Claim
109 words
A low temperature vitreous/crystalline seal glass composition consisting essentially of the following constituents in percent by weight: ______________________________________
Percent by Weight
______________________________________
PbO 63.5-64.6
B.sub.2 O.sub.3
13.0-13.9
Bi.sub.2 O.sub.3
1.2-1.5
ZnO 11.4-11.9
SiO.sub.2 2.4-2.8
Al.sub.2 O.sub.3
0.8-1.0
Cu.sub.2 O 4.3-5.8
______________________________________ said composition having a softening temperature of from about 400° to 408° C, a glass transition temperature of from about 370° to 375° C, a strain temperature of from about 309° to 326° C, and annealing temperature of from about 332° to 342° C; and a thermal coefficient of expansion of from about 83 × 10 - 7 /° C to 86.5 × 10 - 7 /° C.
Claim 3
Dependent Claim
87 words
The composition of claim 1 wherein said composition consists essentially of, by weight, PbO 64.6%, B 2 O 3 13.9%, ZnO 11.9%, Cu 2 O 4.3%, SiO 2 2.8%, Bi 2 O 3 1.5%, and Al 2 O 3 1.0%, said composition having a softening temperature of about 400° C, a glass transition temperature of about 373° C, an annealing temperature of about 334° C, a strain temperature of about 311° C, and a thermal coefficient of expansion of about 83.5 × 10 - 7 /° C.
Claim 4
Dependent Claim
113 words
A process for preparing a low softening temperature vitreous/crystalline seal glass article which is free of lumps and seeds comprising; forming a homogeneous melt by heating a mixture of constituents consisting essentially of, by weight: ______________________________________
Percent by Weight
______________________________________
PbO 63.5-64.6
B.sub.2 O.sub.3
13.0-13.9
Bi.sub.2 O.sub.3
1.2-1.5
ZnO 11.4-11.9
SiO.sub.2 2.4-2.8
Al.sub.2 O.sub.3
0.8-1.0
Cu.sub.2 O 4.3-5.8
______________________________________ and cooling said melt to form a solid vitreous/crystalline seal glass article having a softening temperature of from about 400° to 408° C, a glass transition temperature of from about 370° to 375° C, a strain temperature of from about 309° to 326° C, and annealing temperature of from about 332° to 342° C.
Claim 5
Dependent Claim
113 words
A process for preparing a low softening temperature vitreous/crystalline seal glass article which is free of lumps and seeds comprising; forming a homogeneous melt by heating a mixture of constituents consisting essentially of, by weight: ______________________________________
Percent by Weight
______________________________________
PbO 63.5-64.6
B.sub.2 O.sub.3
13.0-13.9
Bi.sub.2 O.sub.3
1.2-1.5
ZnO 11.4-11.9
SiO.sub.2 2.4-2.8
Al.sub.2 O.sub.3
0.8-1.0
Cu.sub.2 O 4.3-5.8
______________________________________ and cooling said melt to form a solid vitreous/crystalline seal glass article having a softening temperature of from about 400° to 408° C, a glass transition temperature of from about 370° to 375° C, a strain temperature of from about 309° to 326° C, and annealing temperature of from about 332° to 342° C.
Claim 6
Dependent Claim
86 words
The process of claim 2 wherein said mixture is by weight, PbO 64.6%, B 2 O 3 13.9%, Zno 11.9%, Cu 2 O 4.3%, SiO 2 2.8%, Bi 2 O 3 1.5%, and Al 2 O 3 1.0%, and said article has a softening temperature of about 400° C, a glass transition temperature of about 373° C, and annealing temperature of about 334° C, a strain temperature of about 311° C, and a thermal coefficient of expansion of about 83.5 × 10 - 7 /° C.
References Cited (Backward Citations)
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