US4402772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superalloy single crystal articles
Assignee: RTX Corp
•
Filing: 1981-09-14
•
Granted: 1983-09-06
•
Expires: 2001-09-14
Abstract
Abstract A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition is 6% Ta, 9% Cr, 5% Co, 1% Ti, 1% Mo, 7% W, 5.5% Al, 0.15% Hf balance essentially nickel. Material of this composition is cast and solidifed in single crystal form and heat treated to produce an optimum microstructure.
Inventors
- 👤 David N. Duhl
- 👤 Alan D. Cetel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:50
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A heat treated nickel base single crystal superalloy article suited for use at elevated temperatures having a composition consisting essentially of: a. from about 3.5 to about 7% tantalum, b. from about 7.5 to about 11% chromium, c. from about 4 to about 6% cobalt, d. from about 0.6 to about 1.8% titanium, e. from about 0 to about 2.5% molybdenum, f. from about 6 to about 12% tungsten, g. from about 4.5 to about 6.0% aluminum, h. from about 0.05 to about 0.5% hafnium i. balance essentially nickel, said article being free from intentional additions of carbon, boron and zirconium, and said article being free from internal grain boundaries and having an average gamma prime particle size of less than about 0.5 micron and an incipient melting temperature in excess of about 2350° F.
Claim 2
Dependent Claim
135 words
A heat treated nickel base single crystal superalloy article suited for use at elevated temperatures having a composition consisting essentially of: a. from about 3.5 to about 7% tantalum, b. from about 7.5 to about 11% chromium, c. from about 4 to about 6% cobalt, d. from about 0.6 to about 1.8% titanium, e. from about 0 to about 2.5% molybdenum, f. from about 6 to about 12% tungsten, g. from about 4.5 to about 6.0% aluminum, h. from about 0.05 to about 0.5% hafnium i. balance essentially nickel, said article being free from intentional additions of carbon, boron and zirconium, and said article being free from internal grain boundaries and having an average gamma prime particle size of less than about 0.5 micron and an incipient melting temperature in excess of about 2350° F.
Claim 3
Dependent Claim
15 words
An article as in claim 1 in which the tungsten level is less than 10%.
Claim 4
Dependent Claim
15 words
An article as in claim 1 in which the tungsten level is less than 7.5%.
Claim 5
Dependent Claim
23 words
An article as in claim 1 in which the molybdenum level is less than 2% and the chromium level is greater than 7.5%.
Claim 6
Dependent Claim
16 words
An article as in claim 1 in which the tantalum level is less than about 6.5%.
Claim 7
Dependent Claim
33 words
An article as in claim 1 in which the tantalum level is greater than about 3.5%, the hafnium level ranges from about 0.05 to about 0.3%, and the aluminum level ranges from 5-6%.
References Cited (Backward Citations)
US4209348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |