GB731743A - Process of preparing carbonyl iron powders of improved high frequency characteristics - Google Patents
Process of preparing carbonyl iron powders of improved high frequency characteristicsInfo
- Publication number
- GB731743A GB731743A GB7248/53A GB724853A GB731743A GB 731743 A GB731743 A GB 731743A GB 7248/53 A GB7248/53 A GB 7248/53A GB 724853 A GB724853 A GB 724853A GB 731743 A GB731743 A GB 731743A
- Authority
- GB
- United Kingdom
- Prior art keywords
- powder
- per cent
- powders
- carbonyl iron
- tetrasilicate
- 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
- H01F1/20—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 in the form of particles, e.g. powder
- H01F1/22—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 in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—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 in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The electromagnetic properties of carbonyl iron powder are improved by coating the powder which has a carbon content of 0.1 to 1.2 per cent with either an iron phosphate, alkali metal tetrasilicate, or a silicone resin and heating the coated powder to a temperature of 450-600 DEG C. until the carbon content of the powder is less than 0.1 per cent. The coating substance, in amount 0.1 to 0.5 per cent by weight of the powder, may be waterglass, potassium or lithium tetrasilicate, methyl silicone resin, dimethyl, diethyl, dipropyl or dibutyl chloro silanes, polymers of methyl silicone triol and phenyl silicone triol, trimethyl, triethyl, tripropyl or tributyl chlorosilanes, dissolved in a lower alkyl chlorinated hydrocarbon, e.g. chloroform, carbon tetrachloride, ethylene chloride, 1,1-dichloroethane, or 1,1,1-trichloroethane. The coated powder is then dried and reduced in hydrogen of at least 99 per cent purity. The powders may be treated with phosphoric acid to form iron phosphate before reduction. The finished reduced powders are stated to be insulated and suitable for manufacturing into high-frequency cores. U.S.A. Specifications 1,759,659, 2,375,998, 2,381,366, 2,383,817 and 2,508,705 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US731743XA | 1952-03-25 | 1952-03-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB731743A true GB731743A (en) | 1955-06-15 |
Family
ID=22112169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7248/53A Expired GB731743A (en) | 1952-03-25 | 1953-03-16 | Process of preparing carbonyl iron powders of improved high frequency characteristics |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB731743A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2545640A1 (en) * | 1983-05-05 | 1984-11-09 | Gen Electric | MAGNETIC CORE IN IRON POWDER |
| CN108046230A (en) * | 2017-12-16 | 2018-05-18 | 蒋央芳 | A kind of method that one-step method prepares nanometer anhydrous iron phosphate |
| CN112374547A (en) * | 2020-11-13 | 2021-02-19 | 航天特种材料及工艺技术研究所 | Carbonyl iron powder composite wave-absorbing material and preparation method thereof |
-
1953
- 1953-03-16 GB GB7248/53A patent/GB731743A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2545640A1 (en) * | 1983-05-05 | 1984-11-09 | Gen Electric | MAGNETIC CORE IN IRON POWDER |
| CN108046230A (en) * | 2017-12-16 | 2018-05-18 | 蒋央芳 | A kind of method that one-step method prepares nanometer anhydrous iron phosphate |
| CN108046230B (en) * | 2017-12-16 | 2021-01-29 | 蒋央芳 | Method for preparing nano anhydrous iron phosphate by one-step method |
| CN112374547A (en) * | 2020-11-13 | 2021-02-19 | 航天特种材料及工艺技术研究所 | Carbonyl iron powder composite wave-absorbing material and preparation method thereof |
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