US2261425A - Method of making paramagnetic materials - Google Patents
Method of making paramagnetic materials Download PDFInfo
- Publication number
- US2261425A US2261425A US316692A US31669240A US2261425A US 2261425 A US2261425 A US 2261425A US 316692 A US316692 A US 316692A US 31669240 A US31669240 A US 31669240A US 2261425 A US2261425 A US 2261425A
- Authority
- US
- United States
- Prior art keywords
- particles
- paramagnetic materials
- making
- curved
- alcohol
- 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 - Lifetime
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- 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
- B22F1/14—Treatment of metallic powder
Definitions
- This invention relates to the manufacture of cores and other structures formed of comminuted paramagnetic materials.
- the principal object of the present invention is to provide an improved method of "What is claimed is:
- unoxidized spherical or curved parathe powdered particles as by gently agitating a sieve 2 or the like in which the batch is contained.
- the separate particles are rendered molten by' contact with a hot gaseous medium emanating from a flaming liquid fuel 3 such, for example, as alcohol, contained in-a tank or receptacle 4.
- a flaming liquid fuel 3 such, for example, as alcohol, contained in-a tank or receptacle 4. It may be that the particles, upon having the sieve, enter a gaseous strata or zone A wherein they are subject to some degree of oxidation. If this is indeed the case. the oxide or oxides are efiectively reduced upon the conversion of the particles to the molten state, say in the second zone B.
- the now cool rounded or spherical metallic particles are removed from the nonoxidizing medium in which they are'collected, they may v be coated with an insulating substance of a type calculated to ensure high permeability.
- an insulating substance of a type calculated to ensure high permeability.
- the recommended insulating coating materials are iron and zinc salts, which may be formed by treating the particles with phosphoric acid containing some (say 12% by weight) zinc.
- Method of making paramagnetic particles of substantially curved contour which comprises dropping separate molten particles of a magnetic material into flaming alcohol.
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- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
METHOD OF MAKING PARAMAGNETIC MATERIALS Filed Jan. 31, 1940 Enventor Chandler l Vnt orth attorney Patented Nov. 4, i941 METHOD OF ame. PARAMAGNETIC MATERIALS Chandler Wentworth, Haddon Heights, N.J., as-
signor to Radio Corporation of America, a corporation of Delaware Application January 31, 1940, Serial No. 3l6;692 g a 2 Claims. (01.148-1) This invention relates to the manufacture of cores and other structures formed of comminuted paramagnetic materials.
The prior art recognizes that structures formed of curved or'spherical magnetic or paramagnetic particles exhibit a higher resistance to eddy current losses than similar structures formed of irregular or angular particles of the same material. This is so because such curved ,or spher-' ical particles-can be insulated and compressed into a coherent structure with a minimum of damage to the insulation which must necessarily be present between the individual particles in the finished Structure.
While various methods are known for producing such nonangular particles, the usual methods suffer the common disadvantage that their practice results in the production of particles which are coated with an oxide of the metal or alloy of which the particles are formed. It is of course true that such oxide coatings may be utilized as the insulating material which serves to electrically isolate the individual particles in the finished structure; however, the very presence of such oxides results in a structure of lower permeability than would be the case if certain other more efllcient insulating material were to be emp oved.
Accordingly, the principal object of the present invention is to provide an improved method of "What is claimed is:
producing unoxidized spherical or curved parathe powdered particles as by gently agitating a sieve 2 or the like in which the batch is contained. The separate particles are rendered molten by' contact with a hot gaseous medium emanating from a flaming liquid fuel 3 such, for example, as alcohol, contained in-a tank or receptacle 4. It may be that the particles, upon having the sieve, enter a gaseous strata or zone A wherein they are subject to some degree of oxidation. If this is indeed the case. the oxide or oxides are efiectively reduced upon the conversion of the particles to the molten state, say in the second zone B. It is while in the molten state that the particles assume a curved or substantially spherical contourwhich is preserved upon their partial solidification during their passage through the lower temperatures prevailing in the nonoxidizlng gaseous zone 0 immediately above the alcohol or other non-aqueous liquid 3 in which they are collected and cooled.
After the now cool rounded or spherical metallic particlesare removed from the nonoxidizing medium in which they are'collected, they may v be coated with an insulating substance of a type calculated to ensure high permeability. Among the recommended insulating coating materials are iron and zinc salts, which may be formed by treating the particles with phosphoric acid containing some (say 12% by weight) zinc.
1. Method of making paramagnetic particles of substantially curved contour which comprises dropping separate molten particles of a magnetic material into flaming alcohol.
a 2. Method of making unoxidized paramagnetic particles of substantially curved. contour which comprises subjecting separate comminuted particles of a magnetic material to an alcohol flame to render said particles molten and then solidify ingsaid particlesinfluid alcohol. I f cmmmaa vvnu'rwoa'ra.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US316692A US2261425A (en) | 1940-01-31 | 1940-01-31 | Method of making paramagnetic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US316692A US2261425A (en) | 1940-01-31 | 1940-01-31 | Method of making paramagnetic materials |
Publications (1)
Publication Number | Publication Date |
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US2261425A true US2261425A (en) | 1941-11-04 |
Family
ID=23230221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US316692A Expired - Lifetime US2261425A (en) | 1940-01-31 | 1940-01-31 | Method of making paramagnetic materials |
Country Status (1)
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US (1) | US2261425A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2688169A (en) * | 1952-07-11 | 1954-09-07 | Metal Hydrides Inc | Method for melting metal powders |
US2859560A (en) * | 1956-10-02 | 1958-11-11 | Wald Ind Inc | Manufacture of spherical particles |
US3246982A (en) * | 1962-08-16 | 1966-04-19 | Reynolds Metals Co | Method of making a solid length of aluminous metal |
-
1940
- 1940-01-31 US US316692A patent/US2261425A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2688169A (en) * | 1952-07-11 | 1954-09-07 | Metal Hydrides Inc | Method for melting metal powders |
US2859560A (en) * | 1956-10-02 | 1958-11-11 | Wald Ind Inc | Manufacture of spherical particles |
US3246982A (en) * | 1962-08-16 | 1966-04-19 | Reynolds Metals Co | Method of making a solid length of aluminous metal |
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