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US3622374A
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Diffusion coating of ferrous articles
Assignee: RITTER PRAULDER CORP
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Filing: 1969-01-14
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Granted: 1971-11-23
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Expires: 1989-01-14
Abstract
Abstract Improved diffusion coatings on ferrous articles are achieved using pack diffusion techniques when both a source of silicon and boron are present in the pack composition. The silicon comprises from about 1 percent to about 7 percent by weight of the pack composition, and the boron comprises from about 0.5 percent to about 4 percent by weight of the pack composition. Diffusion coatings having a thickness on the order of 30 mils and greater are obtained.
Inventors
- 👤 Earl Grant Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:39
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/40; C23C10/42; C23C12/00; C23C12/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
38 words
The method of claim 1 wherein said silicon comprises from about 1 to about 7 percent by weight of said pack and said boron comprises from about 0.5 percent to about 4 percent by weight of said pack.
Claim 2
Dependent Claim
27 words
The method of claim 2 wherein said silicon comprises 4 percent by weight of said pack and said boron comprises 2 percent by weight of said pack.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said source of silicon is silicon metal.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said source of silicon is silicon carbide.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said source of boron is boron metal.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein said source of boron is boron carbide.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein said source of vaporizable halide is an ammonium halide.
Claim 8
Dependent Claim
12 words
The method of claim 8 wherein said ammonium halide is ammonium chloride.
Claim 9
Dependent Claim
12 words
The method of claim 8 wherein said ammonium halide is ammonium iodide.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein said source of metal for said diffusion is chromium.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein said source of metal for said diffusion is tantalum.
Claim 12
Dependent Claim
15 words
The method of claim 1 wherein said source of metal for said diffusion is titanium.
Claim 13
Dependent Claim
17 words
The method of claim 1 wherein said source of metal for said diffusion is titanium and tantalum.
Claim 14
Dependent Claim
35 words
The method of claim 1 wherein said pack composition and said base imbedded therein are heated to a temperature of between about 1,300* F. to about 2,100* F. thereby to effect diffusion of said metal.
References Cited (Backward Citations)
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |