US3765953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Niobium-based oxidation resistant materials and process for their preparation
Assignee: Safran Aircraft Engines SAS
•
Filing: 1971-08-09
•
Granted: 1973-10-16
•
Expires: 1991-08-09
Abstract
Abstract Niobium and niobium-based alloys are protected against oxidation by providing them with a protective coating of mixed metallic oxides of the Beta -Nb2O5 type.
Inventors
- 👤 J Chevillon
- 👤 G Gauje
- 👤 J Grammagnac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:35
CPC Classifications
C; C23; C23C; C23C12/00; C23C8/00; C23C8/02; C23C8/06; C23C8/08; C23C8/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
Niobium or a niobium-based alloy according to claim 1 wherein said protective coating comprises at least 70 percent by weight of mixed metallic oxides of the Beta form.
Claim 2
Dependent Claim
26 words
Niobium or a niobium-based alloy according to claim 2 are 50 parts aluminum and/or silicon to 1 part each of chromium, iron, nickel, titanium and/or cobalt.
Claim 3
Dependent Claim
52 words
Niobium or a niobium-based alloy according to claim 1, wherein the protective coating composition is taken from the group comprising the following combination of metals: Si, Cr, Fe; Si, Cr, Ti; Al, Cr, Ti; Si, Cr, Fe, Co; Si, Cr, Ti, Co; Al, Cr, Ti, Co; or Al, Cr, Ni, Ti, Co.
Claim 4
Dependent Claim
88 words
Process for the manufacture of niobium or a niobium-based alloy comprising the steps of forming a protective coating of the (Nb, Me)2 O5 type wherein Me includes a metal having a major amount of aluminum or silicon alloyed with chromium and at least one other metal taken from the group consisting essentially of iron, titanium, nickel, cobalt, or mixtures thereof; heating and oxidizing said (Nb, Me)2O5 layer at 700* to 1,200*C for a time sufficient to convert a major portion of said layer to the Beta -oxide form.
Claim 5
Dependent Claim
23 words
The process according to claim 5 wherein said protective layer is heated in air at 700*C to 900*C for at least 50 hours.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |