US4400208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of iron, phosphorus, carbon and chromium based amorphous metal alloys, and the alloys obtained
Assignee: Pont a Mousson SA
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Filing: 1982-02-24
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Granted: 1983-08-23
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Expires: 2002-02-24
Abstract
Abstract A process for producing iron, phosphorus, carbon and chromium based amorphous metal alloys of the type in which a metal alloy in the liquid phase is cooled very rapidly to obtain a vitreous structure, wherein the liquid phase is prepared from cast iron, phosphorus and chromium. This process provides a low cost amorphous alloy as compared to that of crystalline products, and one which, however, possesses improved properties. The invention also relates to the amorphous alloy obtained having the following composition by atomic percentage: Cr: 1.5 to 8; C: 8 to 16; P: 4 to 12; Si: up to 3.5; the remainder being iron and the P/C ratio being less than 1.
Inventors
- 👤 Luc Ackermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:30
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
A process for the production of an iron-based amorphous metal alloy containing phosphorus, carbon, chromium, and iron comprising: (a) preparing a liquid phase by melting cast iron, phosphorus and chromium, and (b) rapidly cooling the resulting liquid phase metal alloy to obtain an amorphous structure.
Claim 2
Dependent Claim
45 words
A process for the production of an iron-based amorphous metal alloy containing phosphorus, carbon, chromium, and iron comprising: (a) preparing a liquid phase by melting cast iron, phosphorus and chromium, and (b) rapidly cooling the resulting liquid phase metal alloy to obtain an amorphous structure.
Claim 3
Dependent Claim
54 words
The process of claim 1, wherein the liquid phase is obtained by the addition of phosphorus, at a rate of 3.8 to 11.5% by weight, and of chromium, at a rate of 0 to 12% by weight, to cast iron in a liquid state, said percentages being calculated in relation to the cast iron.
Claim 4
Dependent Claim
25 words
The process of claim 2, wherein the addition of phosphorus is carried out first, the mixture obtained is cleaned, and then the chromium is added.
Claim 5
Dependent Claim
19 words
The process of claim 2, wherein the addition of chromium is carried out first, then the phosphorus is added.
Claim 6
Dependent Claim
62 words
The process of claim 1, wherein the liquid phase is prepared by simultaneous remelting of cast iron in the solid state and of from 0 to 12% by weight of chromium in the solid state, in relation to the cast iron, then from 3.8 to 11.5% by weight of phosphorus in the solid state is added, in relation to the cast iron.
Claim 7
Dependent Claim
31 words
The process of any one of the preceding claims, wherein the cast iron used is a cleaned cast iron directly obtained during high furnace casting which has undergone no prior treatment.
Claim 8
Dependent Claim
53 words
The process of claim 1, wherein the cast iron used has a weight content of carbon of from 2 to 4.5%, of sulfur of less than 0.45%, of silicon of less than 5%, of manganese of less than 4% and is capable of being alloyed with chromium up to a content of 14%.
Claim 9
Dependent Claim
24 words
The process of claims 2 or 5, wherein the phosphorus is added in the form of ferrophosphorus having a minimum phosphorus content of 15%.
Claim 10
Dependent Claim
25 words
The process of claims 2 or 5, wherein the chromium is added in the form of ferrochromium having a minimum chromium content of approximately 50%.
Claim 11
Dependent Claim
30 words
The process of claim 2, wherein the addition of the ferrophosphorus and of the ferrochromium is carried out to cast iron maintained at a temperature of 1250° to 1450° C.
Claim 12
Dependent Claim
49 words
An iron-based amorphous metal alloy of the type containing iron, phosphorus, carbon and chromium having the following composition by atomic percentage: Cr: 1.5 to 8; C: 8 to 16; P: 4 to 12; Si: up to 3.5; the remainder being iron and the P/C ratio being less than 1.
Claim 13
Dependent Claim
49 words
An iron-based amorphous metal alloy of the type containing iron, phosphorus, carbon and chromium having the following composition by atomic percentage: Cr: 1.5 to 8; C: 8 to 16; P: 4 to 12; Si: up to 3.5; the remainder being iron and the P/C ratio being less than 1.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |