GB1592419A - Magnetic alloys - Google Patents
Magnetic alloys Download PDFInfo
- Publication number
- GB1592419A GB1592419A GB1493678A GB1493678A GB1592419A GB 1592419 A GB1592419 A GB 1592419A GB 1493678 A GB1493678 A GB 1493678A GB 1493678 A GB1493678 A GB 1493678A GB 1592419 A GB1592419 A GB 1592419A
- Authority
- GB
- United Kingdom
- Prior art keywords
- incidental impurities
- balance
- iron
- balance iron
- chromium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
(54) MAGNETIC ALLOYS
(71) We, TELCON METALS LIMITED, a British Company, of Manor Royal,
Crawley, Sussex, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to soft magnetic alloys with good mechanical properties.
A known group of magnetic alloys comprises 45-50% iron, 45-50% cobalt and about 1.5-2.5% vanadium with a preferred nominal composition of 49% Fe, 49% Co, 2% V.
This alloy has been used for some time for a variety of purposes, including in particular the manufacture of stator laminations for electric generators used in aircraft. More recently it has proved possible to process this alloy to a condition suitable for rotor laminations also, but this is dependent on critical control of a heat-treatment cycle that is difficult to achieve, especially in the treatment of commercial quantities of the alloy because it may be difficult to obtain sufficiently precise control of the temperature of the charge in furnace and because it will take some time for the charge to reach a uniform temperature; moreover the cycle required varies from cast to cast and has to be determined by trial for every cast.
In the Complete Specification of our copending British Patent Application no.
8948/75 (serial no. 1523881) we have described and claimed a modified range of alloys with similar magnetic properties that can be processed to obtain comparable or better and consistent mechanical properties over a much wider range of processing conditions, comprising 2-8% nickel, 0.5-3% vanadium, 33-55% cobalt, the balance consisting of iron apart from minor alloying ingredients and incidental impurities. We have now found that useful alloys can be made, if desired, with less than 0.5% vanadium (or with no vanadium at all) provided that a certain levels of chromium are present.
The alloys of the invention comprise: 2-8% nickel; up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is not less than 0.5; 33-55% cobalt; and the balance iron apart from minor alloying ingredients and incidental impurities. Minor alloying ingredients that may be present, with the maximum content of each, are as follows: manganese, 1%; carbon, 0.1%; silicon, 1%; niobium, %; zirconium, 0.3%.
Manganese, silicon and carbon in the ranges indicated assist deoxidation during the melting operation. Niobium and zirconium, if used, are preferably both present with a preferred minimum content of 0.02% Nb and 0.07% Zr; these amounts increase the mechanical strength of the alloy.
A preferred range of alloys in accordance with the invention comprises: 3-5% nickel; chromium and optionally vanadium in amounts such that the % content of vanadium plus twice the % content of chromium is in the range 0.5-2.2; 47-50% cobalt; 0.02% manganese, 0-0.02% carbon, 0-0.2% silicon, 0-0.2% niobium, and 0-0.2% zirconium, the balance being iron apart from impurities.
The alloys of the invention can be fabricated by rolling and stamping or by forging, for example by the procedure described in the Complete Specification of the Main
Application.
The following are examples of the invention, given in weight %:
1 Co 48, Cr 0.75 Ni 4.5 incidental impurities 0.2, balance iron
2 Co 45, Cr 0.8 Ni 2.6, incidental impurities 0.2, balance iron
3 Co 47, Cr 0.75 Ni 3.5, incidental impurities 0.2, balance iron
4 Co 45, Cr 0.75 Ni 5.3 incidental impurities 0.2, balance iron
5. Co 47, Cr 0.7 Ni 5, Nb 0.07 incidental impurities 0.2, balance iron
6. Co 47, Cr 0.75 Ni 5, Nb 0.17 incidental impurities 0.2, Balance iron
7. Co 47, Cr 0.33 Ni 7.4 incidental impurities 0.2, Balance iron
8. Co 35, Ni 4.2 Cr 0.8 incidental impurities 0.2, Balance iron
9. Co 48, V 0.75, Cr 0.4 Ni 4.5 incidental impurities 0.2, balance iron
10. Co 45, V 0.8, Cr 0.4 Ni 2.6 incidental impurities 0.2, balance iron
11. Co 47, V 0.7, Cr 0.4, Ni 3.5, incidental impurities 0.2, balance iron
12. Co 45, V 0.7, Cr 0.4, Ni 5.3, incidental impurities 0.2, balance iron
13. Co 47, V 0.7, Cr 0.3, Ni 5, Nb 0.07, incidental impurities 0.2, balance iron
14. Co 47, V 0.75, Cr 0.3, Ni 5, Nb 0.17, incidental impurities 0.2, balance iron
15. Co 47, V 0.33, Cr 0.16, Ni 7.4, incidental impurities 0.2, balance iron
16. Co 35, V 0.8, Cr 0.4, Ni 4.2, incidental impurities 0.2, balance iron
WHAT WE CLAIM IS:
1. A soft magnetic alloy comprising; 2-8% nickel, up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is not less than 0.5; 33-55% cobalt; and the balance consisting of iron apart from minor alloying ingredients and incidental impurities.
2. A soft magnetic alloy comprising: 2-8% nickel; up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is not less than 0.5; 33-55% cobalt; 0-1% manganese; 0-0.1% carbon; 0-i% silicon; 0-i% niobium; 0-0.3% zirconium; the balance being iron apart from incidental impurities.
3. An alloy as claimed in Claim 2 comprising at least 0.02% niobium and at least 0.07% zirconium.
4. A soft magnetic alloy comprising: 3-5% nickel; up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is in the range 0.5-2.2; 47-50% cobalt; 0-0.7% chromium; 0-0.2% manganese; 0-0.02% carbon; 0-0.2% silicon; 0-0.2% niobium; 0-0.2% zirconium; the balance being iron apart from impurities.
5. A soft magnetic alloy having substantially the composition of any one of examples 1-16.
6. A rotor lamination for an electric generator made of the alloy claimed in any one of the preceding claims.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1 Co 48, Cr 0.75 Ni 4.5 incidental impurities 0.2, balance iron
2 Co 45, Cr 0.8 Ni 2.6, incidental impurities 0.2, balance iron
3 Co 47, Cr 0.75 Ni 3.5, incidental impurities 0.2, balance iron
4 Co 45, Cr 0.75 Ni 5.3 incidental impurities 0.2, balance iron
5. Co 47, Cr 0.7 Ni 5, Nb 0.07 incidental impurities 0.2, balance iron
6. Co 47, Cr 0.75 Ni 5, Nb 0.17 incidental impurities 0.2, Balance iron
7. Co 47, Cr 0.33 Ni 7.4 incidental impurities 0.2, Balance iron
8. Co 35, Ni 4.2 Cr 0.8 incidental impurities 0.2, Balance iron
9. Co 48, V 0.75, Cr 0.4 Ni 4.5 incidental impurities 0.2, balance iron
10. Co 45, V 0.8, Cr 0.4 Ni 2.6 incidental impurities 0.2, balance iron
11. Co 47, V 0.7, Cr 0.4, Ni 3.5, incidental impurities 0.2, balance iron
12. Co 45, V 0.7, Cr 0.4, Ni 5.3, incidental impurities 0.2, balance iron
13. Co 47, V 0.7, Cr 0.3, Ni 5, Nb 0.07, incidental impurities 0.2, balance iron
14. Co 47, V 0.75, Cr 0.3, Ni 5, Nb 0.17, incidental impurities 0.2, balance iron
15. Co 47, V 0.33, Cr 0.16, Ni 7.4, incidental impurities 0.2, balance iron
16. Co 35, V 0.8, Cr 0.4, Ni 4.2, incidental impurities 0.2, balance iron
WHAT WE CLAIM IS:
1. A soft magnetic alloy comprising; 2-8% nickel, up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is not less than 0.5; 33-55% cobalt; and the balance consisting of iron apart from minor alloying ingredients and incidental impurities.
2. A soft magnetic alloy comprising: 2-8% nickel; up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is not less than 0.5; 33-55% cobalt; 0-1% manganese; 0-0.1% carbon; 0-i% silicon; 0-i% niobium; 0-0.3% zirconium; the balance being iron apart from incidental impurities.
3. An alloy as claimed in Claim 2 comprising at least 0.02% niobium and at least 0.07% zirconium.
4. A soft magnetic alloy comprising: 3-5% nickel; up to 0.8% vanadium and 0.161.5% chromium subject to the proviso that the % content of vanadium plus twice the % content of chromium is in the range 0.5-2.2; 47-50% cobalt; 0-0.7% chromium; 0-0.2% manganese; 0-0.02% carbon; 0-0.2% silicon; 0-0.2% niobium; 0-0.2% zirconium; the balance being iron apart from impurities.
5. A soft magnetic alloy having substantially the composition of any one of examples 1-16.
6. A rotor lamination for an electric generator made of the alloy claimed in any one of the preceding claims.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1493678A GB1592419A (en) | 1978-04-17 | 1978-04-17 | Magnetic alloys |
| FR7909360A FR2423550B1 (en) | 1978-04-17 | 1979-04-12 | MAGNETIC ALLOY HAVING GOOD MECHANICAL PROPERTIES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1493678A GB1592419A (en) | 1978-04-17 | 1978-04-17 | Magnetic alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1592419A true GB1592419A (en) | 1981-07-08 |
Family
ID=10050163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1493678A Expired GB1592419A (en) | 1978-04-17 | 1978-04-17 | Magnetic alloys |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2423550B1 (en) |
| GB (1) | GB1592419A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471899A (en) * | 2020-04-27 | 2020-07-31 | 江苏精研科技股份有限公司 | High-performance soft magnetic alloy powder and preparation process for preparing complex parts |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL128067A (en) * | 1998-02-05 | 2001-10-31 | Imphy Ugine Precision | Iron-cobalt alloy |
-
1978
- 1978-04-17 GB GB1493678A patent/GB1592419A/en not_active Expired
-
1979
- 1979-04-12 FR FR7909360A patent/FR2423550B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471899A (en) * | 2020-04-27 | 2020-07-31 | 江苏精研科技股份有限公司 | High-performance soft magnetic alloy powder and preparation process for preparing complex parts |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2423550A1 (en) | 1979-11-16 |
| FR2423550B1 (en) | 1985-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19960302 |