US4098194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypervelocity projectile with aluminum components of high resistance to thermodynamic ablation
Assignee: United States Department of the Army
•
Filing: 1977-06-01
•
Granted: 1978-07-04
•
Expires: 1997-06-01
Abstract
Abstract A hypervelocity projectile is provided with aluminum components, such as s and windshields, which possess a coating having high resistance to thermodynamic ablation on the aluminum components. The coating is formed by first producing a "hard" anodic coating on the aluminum component by anodic oxidation of the aluminum in an acid electrolyte maintained below 10° C, and sealing the hard coating with a hot aqueous solution of an alkali metal silicate of the formula Me 2 O:x.SiO 2 , wherein Me is an alkali metal and x is at least about 2.0, e.g., a 5 - 10% aqueous solution of Na 2 O:x.SiO 2 , wherein x is about 3.25.
Inventors
- 👤 Gary M. Miller
- 👤 Curtis J. Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:29
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/246; F; F42; F42B; F42B10/00; F42B10/02; F42B10/04; F42B10/06; F42B12/00; F42B12/72; F42B12/76; F42B12/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A hypervelocity kinetic energy projectile containing external aluminum stabilizing fins having a coating of high resistance to thermodynamic ablation, said coating consisting essentially of a hard anodic oxide coating sealed by contact with an aqueous solution of an alkali metal silicate of the formula Me 2 O:x.SiO 2 , wherein Me is an alkali metal and x is at least 2.0.
Claim 2
Dependent Claim
61 words
A hypervelocity kinetic energy projectile containing external aluminum stabilizing fins having a coating of high resistance to thermodynamic ablation, said coating consisting essentially of a hard anodic oxide coating sealed by contact with an aqueous solution of an alkali metal silicate of the formula Me 2 O:x.SiO 2 , wherein Me is an alkali metal and x is at least 2.0.
Claim 3
Dependent Claim
13 words
The projectile of claim 1, wherein the alkali metal silicate is sodium silicate.
Claim 4
Dependent Claim
24 words
The projectile of claim 2, wherein the hard anodic oxide coating is obtained by anodizing the aluminum component in an aqueous sulfuric acid electrolyte.
Claim 5
Dependent Claim
43 words
The projectile of claim 3, wherein the hard anodic coating is sealed by contact with an aqueous solution containing about from 5% to 10% by weight of sodium silicate in which the ratio of SiO 2 to Na 2 O is about 3.25:1.
References Cited (Backward Citations)
US1946153A
Cited
US2076898A
Cited
US2151048A
Cited
US2692851A
Cited
US3376205A
Cited
US3812023A
Cited
US3956080A
Cited
US3830666A
Cited
US3846182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |