US4816216A
Expired / Lapsed
US
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Interdiffusion resistant Fe--Ni alloys having improved glass sealing
Assignee: Olin Corp
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Filing: 1985-11-29
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Granted: 1989-03-28
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Expires: 2005-11-29
Abstract
Abstract The present invention relates to an iron-nickel alloy containing from about 30% to about 60% nickel, from about 0.001% to about 0.15% nitrogen, at least one element selected from the group consisting of from about 1% to about 10% molybdenum and from about 0.001% to about 2% aluminum and the balance essentially iron. The alloys demonstrate improved resistance to intermetallic compound formation, improved glass to metal sealing properties, and improved wirebonding performance. The alloys of the present invention have particular utility as a lead frame material for semiconductor packages.
Inventors
- 👤 Chung-Yao Chao
- 👤 John F. Breedis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:53
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C38/00; C22C38/08; H; H10; H10W; H10W70/00; H10W70/40; H10W70/456; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5524; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
67 words
A silicon free iron-nickel alloy for use in electrical and electronic applications having improved resistance to intermetallic compound formation, said alloy consisting essentially of from about 30% to about 60% nickel, from about 0.005% to about 0.15% nitrogen, at least one element selected from the group consisting of from about 1% to about 105 molybdenum and from about 0.001% to about 2% aluminum, and the balance iron.
Claim 2
Dependent Claim
67 words
A silicon free iron-nickel alloy for use in electrical and electronic applications having improved resistance to intermetallic compound formation, said alloy consisting essentially of from about 30% to about 60% nickel, from about 0.005% to about 0.15% nitrogen, at least one element selected from the group consisting of from about 1% to about 105 molybdenum and from about 0.001% to about 2% aluminum, and the balance iron.
Claim 3
Dependent Claim
36 words
The alloy of claim 1 wherein said at least one element comprises molybdenum, said molybdenum increasing the nitrogen solubility and/or diffusivity of the alloy and being present in an amount in accordance with the following equation:
Claim 4
Dependent Claim
20 words
The alloy of claim 1 wherein said at least one element consists of from about 1% to about 4% molybdenum.
Claim 5
Dependent Claim
13 words
The alloy of claim 1 further comprising: said alloy having a single phase.
Claim 6
Dependent Claim
16 words
The alloy of claim 1 further comprising: said alloy having a face centered cubic metallurgical structure.
Claim 7
Dependent Claim
22 words
The alloy of claim 1 further consisting essentially of said nitrogen being present in an amount from about 0.005% to about 0.05%.
Claim 8
Dependent Claim
25 words
The alloy of claim 1 wherein the ratio of iron to nickel in said alloy is in the range of about 1.1:1 to about 1.6:1.
Claim 9
Dependent Claim
48 words
The alloy of claim 1 further consisting essentially of at least one additional element selected from the group consisting of from an effective amount up to about 1.05 manganese and from an effective amount up to about 0.1% magnesium for reducing the effects of sulfur impurities during casting.
Claim 10
Dependent Claim
22 words
The alloy of claim 3 further consisting essentially of said nitrogen being present in an amount from about 0.005% to about 0.05%.
Claim 11
Dependent Claim
49 words
A silicon free iron-nickel alloy for use in electrical and electronic applications having improved resistance to intermetallic compound formation, said alloy consisting essentially of from about 30% to about 60% nickel, from about 0.005% to about 0.15% nitrogen, from about 0.3% to about 1.05 aluminum, and the balance iron.
Claim 12
Dependent Claim
49 words
A silicon free iron-nickel alloy for use in electrical and electronic applications having improved resistance to intermetallic compound formation, said alloy consisting essentially of from about 30% to about 60% nickel, from about 0.005% to about 0.15% nitrogen, from about 0.3% to about 1.05 aluminum, and the balance iron.
Claim 13
Dependent Claim
56 words
A silicon free iron-nickel alloy for use in electrical and electronic applications having improved resistance to intermetallic compound formation, said alloy consisting essentially of from about 30% to about 60% nickel, from about 0.005% to about 0.15% nitrogen, from about 1% to about 4% molybdenum, from about 0.3% to about 1.0% aluminum, and the balance iron.
Claim 14
Dependent Claim
56 words
A silicon free iron-nickel alloy for use in electrical and electronic applications having improved resistance to intermetallic compound formation, said alloy consisting essentially of from about 30% to about 60% nickel, from about 0.005% to about 0.15% nitrogen, from about 1% to about 4% molybdenum, from about 0.3% to about 1.0% aluminum, and the balance iron.
Claim 15
Dependent Claim
28 words
The alloy of claim 11 further consisting essentially of: the ratio of iron to nickel in said alloy being in the range of about 1.1:1 to about 1.6:1.
Claim 16
Dependent Claim
48 words
The alloy of claim 11 further consisting essentially of at least one additional element selected from the group consisting of from an effective amount up to about 1.0% manganese and from an effective amount up to about 0.1% magnesium for reducing the effects of sulfur impurities during casting.
Claim 17
Dependent Claim
22 words
The alloy of claim 10 further consisting essentially of: said nitrogen being present in an amount from about 0.005% to about 0.5%.
Claim 18
Dependent Claim
29 words
The alloy of claim 14 further consisting essentially of: the ratio of iron to nickel in said alloy being in the range of from about 1.1:1 to about 1.6:1.
Claim 19
Dependent Claim
21 words
The alloy claim 1 further consisting essentially of said nickel being present in an amount from about 39% to about 55%.
Claim 20
Dependent Claim
36 words
The alloy of claim 1 wherein said alloy consists essentially of from about 395 to about 47% nickel, from about 1% to about 5.1% molybdenum and an amount of nitrogen in accordance with the following equation:
Claim 21
Dependent Claim
22 words
The alloy of claim 1 further consisting essentially of said nitrogen being present in an amount from about 0.01% to about 0.15%.
Claim 22
Dependent Claim
9 words
A lead frame comprising the alloy of claim 1.
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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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |