US4637837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for boriding metals and metal alloys by means of solid boriding agents
Assignee: Elektroschmelzwerk Kempten GmbH
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Filing: 1985-06-20
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Granted: 1987-01-20
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Expires: 2005-06-20
Abstract
Abstract A process is provided for boriding metals and metal alloys in a fluidized bed at a temperature of from about 580° to about 1300° C. As a boriding agent, there was used a granular material comprising essentially spherical particles having a particle size of from about 0.025 to about 5.00 mm, which granular material was manufactured by spray drying a preferably aqueous suspension or dispersion based on materials that yield boron, and which can contain fillers, extenders and binders.
Inventors
- 👤 Alfred G. von Matuschka
- 👤 Norbert Trausner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/68; C23C8/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A process for boriding metals and metal alloys using a solid boriding agent comprised of materials that yield boron, said process comprising conducting said boriding in a fluidized bed at a temperature of from about 580° to about 1300° C. using as the solid boriding agent material in granular form and comprised essentially of spherical particles having a particle size of from about 0.025 to about 5.0 mm.
Claim 2
Dependent Claim
68 words
A process for boriding metals and metal alloys using a solid boriding agent comprised of materials that yield boron, said process comprising conducting said boriding in a fluidized bed at a temperature of from about 580° to about 1300° C. using as the solid boriding agent material in granular form and comprised essentially of spherical particles having a particle size of from about 0.025 to about 5.0 mm.
Claim 3
Dependent Claim
22 words
The process according to claim 1 wherein said spherical particles have a particle size of from about 0.05 to about 2.0 mm.
Claim 4
Dependent Claim
21 words
The process according to claim 1 wherein said boriding agent contains materials that yield boron, and activators, fillers, extenders and binders.
Claim 5
Dependent Claim
13 words
The process according to claim 1 wherein said granular material contains boron carbide.
Claim 6
Dependent Claim
12 words
The process according to claim 3 wherein said activator is potassium tetrafluoroborate.
Claim 7
Dependent Claim
12 words
The process according to claim 3 wherein said filler is silicon carbide.
Claim 8
Dependent Claim
12 words
The process according to claim 3 wherein said binder is a saccharide.
Claim 9
Dependent Claim
31 words
The process according to claim 1 wherein said granular material has been prepared by spray drying an aqueous suspension or dispersion of said material using mono- di- or polysaccharides as binders.
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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |