Patent US4997718A successfully refreshed from Google Patents.
US4997718A
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Silver phosphate glass die-attach composition
Assignee: Vlsi Packaging Materials Inc
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Filing: 1989-11-08
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Granted: 1991-03-05
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Expires: 2009-11-08
Abstract
Abstract Extremely low-melting oxide glasses useful in silver/glass die-attach materials are disclosed. These glasses are composed of silver oxide, phosphorus oxide and a third component comprising PbO, CdO, ZnO or combination thereof. Their melting point lies in the 200°-300° C. range.
Inventors
- 👤 Maurice E. Dumesnil
- 👤 Leo Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:25
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C8/00; C03C8/14; C03C8/18; C03C8/24; H; H10; H10W; H10W72/00; H10W72/071; H10W72/073; H10W72/07331; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/353
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
70 words
A low-melting glass composition consisting essentially of, in weight per cent calculated on an oxide basis: ______________________________________
(a) Ag.sub.2 O:
40 to 70%
(b) P.sub.2 O.sub.5 :
20 to 40%
(c) PbO: 0.1 to 25%
(d) Bi.sub.2 O.sub.3 :
0 to 20%
(e) Nb.sub.2 O.sub.5 :
0 to 5%
(f) Ta.sub.2 O.sub.5 :
0 to 5%
(g) Al.sub.2 O.sub.3 :
0 to 5%
(h) Cu.sub.2 O:
0 to 5%.
______________________________________
Claim 2
Dependent Claim
70 words
A low-melting glass composition consisting essentially of, in weight per cent calculated on an oxide basis: ______________________________________
(a) Ag.sub.2 O:
40 to 70%
(b) P.sub.2 O.sub.5 :
20 to 40%
(c) PbO: 0.1 to 25%
(d) Bi.sub.2 O.sub.3 :
0 to 20%
(e) Nb.sub.2 O.sub.5 :
0 to 5%
(f) Ta.sub.2 O.sub.5 :
0 to 5%
(g) Al.sub.2 O.sub.3 :
0 to 5%
(h) Cu.sub.2 O:
0 to 5%.
______________________________________
Claim 3
Dependent Claim
23 words
The low-melting glass composition of claim 1 wherein the weight per cent of each of (d), (e), (f), (g) and (h) is 0%.
Claim 4
Dependent Claim
55 words
A low-melting glass composition consisting essentially of in weight per cent calculated on an oxide basis; ______________________________________
(a) Ag.sub.2 O
50 to 60%
(b) P.sub.2 O.sub.5
25 to 35%
(c) PbO 5 to 20%
(d) Bi.sub.2 O.sub.3
0 to 10%
(e) Al.sub.2 O.sub.3 :
0 to 3%
(f) Nb.sub.2 O.sub.3 :
0 to 3%.
______________________________________
Claim 5
Dependent Claim
55 words
A low-melting glass composition consisting essentially of in weight per cent calculated on an oxide basis; ______________________________________
(a) Ag.sub.2 O
50 to 60%
(b) P.sub.2 O.sub.5
25 to 35%
(c) PbO 5 to 20%
(d) Bi.sub.2 O.sub.3
0 to 10%
(e) Al.sub.2 O.sub.3 :
0 to 3%
(f) Nb.sub.2 O.sub.3 :
0 to 3%.
______________________________________
Claim 6
Dependent Claim
29 words
The glass of claim 1 mixed with about 1 to 50% by weight, based on the mixture, of a refractory filler powder with a low coefficient of linear expansion.
Claim 7
Dependent Claim
28 words
The glass of claim 2 mixed with about 1 to by weight, based on the mixture, of a refractory filler powder with a low coefficient of linear expansion.
Claim 8
Dependent Claim
28 words
The glass of claim 3 mixed with about 1 to by weight, based on the mixture, of a refractory filler powder with a low coefficient of linear expansion.
Claim 9
Dependent Claim
21 words
The glass of claim 1 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 10
Dependent Claim
21 words
The glass of claim 2 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 11
Dependent Claim
21 words
The glass of claim 3 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 12
Dependent Claim
40 words
A composition comprising a glass consisting essentially of: ______________________________________
(a) Ag.sub.2 O
40 to 70%
(b) P.sub.2 O.sub.5
20 to 40%
(c) Bi.sub.2 O.sub.3
0.1 to 25%
______________________________________ mixed with 50 to 90% by weight of silver or gold powder.
Claim 13
Dependent Claim
40 words
A composition comprising a glass consisting essentially of: ______________________________________
(a) Ag.sub.2 O
40 to 70%
(b) P.sub.2 O.sub.5
20 to 40%
(c) Bi.sub.2 O.sub.3
0.1 to 25%
______________________________________ mixed with 50 to 90% by weight of silver or gold powder.
Claim 14
Dependent Claim
19 words
The composition of claim 2 blended with an organic liquid to form a printing ink or a dotting paste.
Claim 15
Dependent Claim
19 words
The composition of claim 2 blended with an organic liquid to form a printing ink or a dotting paste.
Claim 16
Dependent Claim
19 words
The composition of claim 3 blended with an organic liquid to form a printing ink or a dotting paste.
Claim 17
Dependent Claim
19 words
The composition of claim 7 blended with an organic liquid to form a printing ink or a dotting paste.
Claim 18
Dependent Claim
19 words
The composition of claim 10 blended with an organic liquid to form a printing ink or a dotting paste.
Claim 19
Dependent Claim
22 words
An article of manufacture comprising an electronic part bonded to a metal, glass or ceramic substrate with the composition of claim 1.
Claim 20
Dependent Claim
22 words
An article of manufacture comprising an electronic part bonded to a metal, glass or ceramic substrate with the composition of claim 3.
Claim 21
Dependent Claim
22 words
An article of manufacture comprising an electronic part bonded to a metal, glass or ceramic substrate with the composition of claim 7.
Claim 22
Dependent Claim
22 words
An article of manufacture comprising an electronic part bonded to a metal, glass or ceramic substrate with the composition of claim 10.
Claim 23
Dependent Claim
23 words
An article of manufacture comprising a metal, glass or ceramic body coated with an electrically conductive pattern of the composition of claim 7.
Claim 24
Dependent Claim
23 words
An article of manufacture comprising a metal, glass or ceramic body coated with an electrically conductive pattern of the composition of claim 10.
Claim 25
Dependent Claim
9 words
A solid silver/glass preform of composition of claim 7.
Claim 26
Dependent Claim
9 words
A solid silver/glass preform of composition of claim 10.
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