GB927289A - Improvements relating to permanent magnets - Google Patents
Improvements relating to permanent magnetsInfo
- Publication number
- GB927289A GB927289A GB3268559A GB3268559A GB927289A GB 927289 A GB927289 A GB 927289A GB 3268559 A GB3268559 A GB 3268559A GB 3268559 A GB3268559 A GB 3268559A GB 927289 A GB927289 A GB 927289A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- particles
- heat treatment
- magnet
- tetragonal
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
-
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
-
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
- H01F1/06—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
A permanent magnet has as a constituent a phase which has been produced by a thermal treatment and which contains at least 60% Mn with the remainder substantially Al, the phase having a tetragonal crystal structure with an axes ratio c/a of >1 and <2. An example of this phase is that occurring in a binary Mn-Al alloy (Mn: Al atom ratio 5:4) and having the required structure with an axes ratio about 1.3 and an occupation of the lattice points 0, 0, 0 and 1/2 , \ba1/2 , \ba1/2 with a preference of the Mn atoms for one of these points. The Mn-Al alloy may be heat-treated to obtain the tetragonal phase by either (1) heating at a temperature below 1000 DEG C. for a sufficient time, or (2) cooling between 825 DEG and 600 DEG C. at a rate of 0.5-100 DEG C./second, or (3) cooling to below 825 DEG C. at a rate of more than 100 DEG C./second and then heating between 825 DEG and 600 DEG C. for a sufficient time. Homogenization before and annealing at 200-600 DEG C. after the phase-production heat treatment is beneficial. Particles for the production of the magnet may be produced by either (1) effecting solid state diffusion of powders of the constituent metals or pre-alloys thereof or (2) pulverizing a cast or sintered Mn-Al body with or without a prior heat treatment so that the brittle b phase is obtained. The particles are then heat-treated to produce the tetragonal phase. Alternatively the body may be pulverized after the phase-production heat treatment. The particles are formed into a magnet by compression with or without sintering; they may be oriented in a magnetic field before or during compression. Specification 771,538 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL231826 | 1958-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB927289A true GB927289A (en) | 1963-05-29 |
Family
ID=19751365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3268559A Expired GB927289A (en) | 1958-09-30 | 1959-09-25 | Improvements relating to permanent magnets |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH410215A (en) |
ES (1) | ES252340A1 (en) |
GB (1) | GB927289A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2122220A (en) * | 1982-04-23 | 1984-01-11 | Wolfen Filmfab Veb | Powder for magnetic recording materials |
US11441218B2 (en) | 2017-01-05 | 2022-09-13 | Tdk Corporation | MnAl alloy and production method thereof |
-
1959
- 1959-09-25 GB GB3268559A patent/GB927289A/en not_active Expired
- 1959-09-26 CH CH7869959A patent/CH410215A/en unknown
- 1959-09-28 ES ES0252340A patent/ES252340A1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2122220A (en) * | 1982-04-23 | 1984-01-11 | Wolfen Filmfab Veb | Powder for magnetic recording materials |
US11441218B2 (en) | 2017-01-05 | 2022-09-13 | Tdk Corporation | MnAl alloy and production method thereof |
Also Published As
Publication number | Publication date |
---|---|
ES252340A1 (en) | 1960-03-16 |
CH410215A (en) | 1966-03-31 |
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