US4011107A
Expired / Lapsed
US
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Boron diffusion coating process
Assignee: Howmet Turbine Components Corp
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Filing: 1975-10-08
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Granted: 1977-03-08
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Expires: 1995-10-08
Abstract
Abstract This invention is addressed to a process for the diffusion coating of metals which are capable of forming a compound or a solid solution with boron by contacting the metal with boron at a temperature greater than 1350° F.
Inventors
- 👤 William J. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:52
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/68; C23C8/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A process for the diffusion coating of metals with boron, comprising the steps of packing a solid metal substrate in which the metal is free from titanium and is capable of forming a compound or solid sollution with boron, said metal being selected from the group consisting of iron alloys, nickel alloys, cobalt alloys, molybdenum, tungsten and alloys thereof having a melting point at a temperature above 1350° F, with a composition consisting essentially of a refractory oxide or refractory salt and boron in an amount within the range of 0.2 to 15% by weight based upon the metal of the oxide or salt and the boron, and heating the pack to a temperature above 1350° F under non-oxidizing conditions to diffusion coat the substrate.
Claim 2
Dependent Claim
125 words
A process for the diffusion coating of metals with boron, comprising the steps of packing a solid metal substrate in which the metal is free from titanium and is capable of forming a compound or solid sollution with boron, said metal being selected from the group consisting of iron alloys, nickel alloys, cobalt alloys, molybdenum, tungsten and alloys thereof having a melting point at a temperature above 1350° F, with a composition consisting essentially of a refractory oxide or refractory salt and boron in an amount within the range of 0.2 to 15% by weight based upon the metal of the oxide or salt and the boron, and heating the pack to a temperature above 1350° F under non-oxidizing conditions to diffusion coat the substrate.
Claim 3
Dependent Claim
30 words
A process as defined in claim 1 wherein the refractory oxide or salt is selected from the group consisting of aluminum oxide, silica, zirconium oxide, calcium fluoride and mixtures thereof.
Claim 4
Dependent Claim
20 words
A process as defined in claim 1 wherein the metal contains a surface coating of boron in an organic binder.
Claim 5
Dependent Claim
25 words
A process as defined in claim 1 wherein the process is carried out at a temperature within the range of 1350° F. to 2500° F.
Claim 6
Dependent Claim
18 words
A process as defined in claim 1 wherein the process is carried out for 0.25 to 25 hours.
Claim 7
Dependent Claim
20 words
A process as defined in claim 1 wherein the process is carried out under a blanket of an inert gas.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |