US4797166A
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Method for producing an at least partly amorphous alloy piece
Assignee: CENDRES & METAUX SA A SWISS CORP
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Filing: 1987-05-11
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Granted: 1989-01-10
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Expires: 2007-05-11
Abstract
Abstract An alloy, e.g. a Cr-Ti alloy, is transformed to a metastable crystal modification, e.g., by heating in an electric arc and quenching in water. The metastable crystal modification is annealed at a temperature which is below the glass temperature, e.g. at 600° C. during 48 hours, causing it to vitrify completely. The inventive method provided the production of large pieces of hard and non-porous amorphous alloy with thicknesses in the centimeter range.
Inventors
- 👤 Martin Von Allmen
- 👤 Andreas Blatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:54
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/006; B22F3/007; C; C22; C22C; C22C45/00; C22C45/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
187 words
A method for producing an at least partly amorphous alloy piece, comprising the steps of preparing an alloy composition of at least two elements of appreciably different atomic radius, at least one of said elements being elected from the group consisting of Si, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Pd, Ag, Hf, Ta, W, Pt or Au, the composition being chosen such that a high -temperature solution crystal or high-temperature compound crystal exists for said composition, heating the composition to an elevated temperature with respect to the glass temperature, so that the composition becomes a high-temperature solution crystal or high-temperature compound crystal, quenching the composition to a temperature below the glass temperature at such a cooling rate, that the high-temperature solution crystal or high-temperature compound crystal is preserved as a metastable crystal phase in at least a part of the composition, annealing the composition under a vacuum or in an inert gas environment at an annealing temperature, which is below the glass temperature by a tolerance of at least a few degrees in order to vitrify the metastable crystal phase.
Claim 2
Independent Claim
187 words
A method for producing an at least partly amorphous alloy piece, comprising the steps of preparing an alloy composition of at least two elements of appreciably different atomic radius, at least one of said elements being elected from the group consisting of Si, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Pd, Ag, Hf, Ta, W, Pt or Au, the composition being chosen such that a high -temperature solution crystal or high-temperature compound crystal exists for said composition, heating the composition to an elevated temperature with respect to the glass temperature, so that the composition becomes a high-temperature solution crystal or high-temperature compound crystal, quenching the composition to a temperature below the glass temperature at such a cooling rate, that the high-temperature solution crystal or high-temperature compound crystal is preserved as a metastable crystal phase in at least a part of the composition, annealing the composition under a vacuum or in an inert gas environment at an annealing temperature, which is below the glass temperature by a tolerance of at least a few degrees in order to vitrify the metastable crystal phase.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein the composition is generated to a temperature below said annealing temperature and reheated to said annealing temperature.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein the high-temperature solution crystal or high-temperature compound crystal has at temperatures below the glass temperature a lower free energy than the glass phase.
References Cited (Backward Citations)
US4226647A
Cited
US4639363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |