US4149910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass or ceramic-to-metal composites or seals involving iron base alloys
Assignee: Olin Corp
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Filing: 1975-05-27
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Granted: 1979-04-17
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Expires: 1995-05-27
Abstract
Abstract Glass or ceramic-to-metal composites or seals wherein the glass or ceramic is bonded to an iron base alloy consisting essentially of from 1-5% silicon and from 1-10% chromium, remainder iron. The alloy develops a thermal oxide film which consists essentially of chromium oxide and alpha Fe2O3 which may comprise from 10 to 100% of the oxide film thickness on the metal. The invention also includes a process of bonding the glass or ceramic to the metal which eliminates the need of a prolonged heat treatment performed in a special atmosphere.
Inventors
- 👤 James M. Popplewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:53
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; C03; C03C; C03C27/00; C03C27/04; C03C27/042; C03C27/046; C03C29/00; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/54; C04B2237/82
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A process for forming a glass or ceramic-to-metal composite or seal which comprises: preparing an iron base alloy component by providing a mixture comprising from 1-10% chromium, balance iron, and adding to said mixture from 1-5% silicon as based on the total resulting mixture thereof; oxidizing said iron base alloy component by heating in air at a temperature of up to 800° C. for a maximum of three minutes to form on the surface of said component a thin, adherent oxide film consisting essentially of chromium oxide and αFe 2 O 3 ; and placing a quantity of glass or ceramic metal on the surface of said oxidized iron base alloy component and heating the so-coated component at the sealing temperature of said glass or ceramic for a time sufficient to fuse said glass or ceramic to said iron base alloy component, wherein said composite may be characterized by a high degree of mismatch of coefficient of thermal expansion between said glass or ceramic and said iron base alloy component.
Claim 2
Dependent Claim
170 words
A process for forming a glass or ceramic-to-metal composite or seal which comprises: preparing an iron base alloy component by providing a mixture comprising from 1-10% chromium, balance iron, and adding to said mixture from 1-5% silicon as based on the total resulting mixture thereof; oxidizing said iron base alloy component by heating in air at a temperature of up to 800° C. for a maximum of three minutes to form on the surface of said component a thin, adherent oxide film consisting essentially of chromium oxide and αFe 2 O 3 ; and placing a quantity of glass or ceramic metal on the surface of said oxidized iron base alloy component and heating the so-coated component at the sealing temperature of said glass or ceramic for a time sufficient to fuse said glass or ceramic to said iron base alloy component, wherein said composite may be characterized by a high degree of mismatch of coefficient of thermal expansion between said glass or ceramic and said iron base alloy component.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein said oxide film is thermally formed during the heating of the glass or ceramic component in contact with said iron base alloy component.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the iron base alloy component additionally contains from 0.001-1% aluminum, from 0.001-5% nickel, from 0.001-5% cobalt for added strength and from 0.001-1% carbon for increased wear resistance.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the iron base alloy component consists essentially of from 1-3% silicon, from 1-3% chromium, and the balance essentially iron.
Claim 6
Dependent Claim
144 words
A process for forming a glass or ceramic-to-metal composite or seal which comprises: preparing an iron base alloy component by providing a mixture comprising from 1-10% chromium, balance iron, and adding to said mixture from 1-5% silicon as based on the total resulting mixture thereof; and placing a quantity of glass or ceramic material on the surface of said iron base alloy component and heating said component in air at the sealing temperature of said glass or ceramic for a time sufficient to fuse said glass or ceramic to said component while oxidizing said iron base alloy component to form a thin adherent oxide film consisting essentially of chromium oxide and αFe 2 O 3 , wherein said composite may be characterized by a high degree of mismatch of coefficient of thermal expansion between said glass or ceramic and said iron base alloy component.
Claim 7
Dependent Claim
144 words
A process for forming a glass or ceramic-to-metal composite or seal which comprises: preparing an iron base alloy component by providing a mixture comprising from 1-10% chromium, balance iron, and adding to said mixture from 1-5% silicon as based on the total resulting mixture thereof; and placing a quantity of glass or ceramic material on the surface of said iron base alloy component and heating said component in air at the sealing temperature of said glass or ceramic for a time sufficient to fuse said glass or ceramic to said component while oxidizing said iron base alloy component to form a thin adherent oxide film consisting essentially of chromium oxide and αFe 2 O 3 , wherein said composite may be characterized by a high degree of mismatch of coefficient of thermal expansion between said glass or ceramic and said iron base alloy component.
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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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |