US1790704A - Obatobieb - Google Patents
Obatobieb Download PDFInfo
- Publication number
- US1790704A US1790704A US1790704DA US1790704A US 1790704 A US1790704 A US 1790704A US 1790704D A US1790704D A US 1790704DA US 1790704 A US1790704 A US 1790704A
- Authority
- US
- United States
- Prior art keywords
- iron
- nickel
- magnetic
- dust
- cobalt
- 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
Links
- 239000000428 dust Substances 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 239000000463 material Substances 0.000 description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 20
- 239000000696 magnetic material Substances 0.000 description 18
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 14
- 229910052803 cobalt Inorganic materials 0.000 description 14
- 239000010941 cobalt Substances 0.000 description 14
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 12
- 229910052750 molybdenum Inorganic materials 0.000 description 12
- 239000011733 molybdenum Substances 0.000 description 12
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 10
- 229910052797 bismuth Inorganic materials 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 10
- 229910052759 nickel Inorganic materials 0.000 description 10
- 229910052718 tin Inorganic materials 0.000 description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N tin hydride Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 10
- -1 iron-nickel Chemical compound 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000005098 hot rolling Methods 0.000 description 6
- 229910000640 Fe alloy Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000001627 detrimental Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
Classifications
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
Definitions
- the present invention relates to the production of magnetic materials and particularly to a method for producing such materials in finely divided form.
- An ob'ect of the invention is to facilitate the pro uction of finely divided magnetic materials such as are used in loading coils and other cores.
- Another object of the invention is to so 19 condition various magnetic materials such as, for instance, alloys of iron and nickel containing about 78 nickel and the balance iron plus molybdenum, and alloys of iron,
- nickel and cobalt containing about 45% nickel, cobalt and the balance iron, or
- a further objectof the invention is to ingo crease the yield of finely divided dust resulting from working the alloys mentioned in finely divided form.
- the invention is of particular advantage in the manufacture of magnetic loading coil 25 cores in which the core is composed of finelydivided magnetic material, usually referred toas dust. It has been customary to hot roll cast billets of these materials preliminary to the comminuting operation in order to break' so up and transform the cast grain structure which is usually characterized by large primary crystals.
- Iron-nickel alloys have their magnetic and electrical properties beneficially improved by the addition of such elements as cobalt or molybdenum but they are more difficult to reduce to dust of the fineness required for dust core coils when such elements are present.
- cobalt as a. constituent element it is difficult to secure a high yield of dust in finely divided form by the usual hot rolling methods.
- This detrimental effect of cobalt is particularly noticeable and is perhaps enhanced by the resence of elements such as molybdenum, c romium or tungsten, and perhaps others which may be added tomagnetic materials of this type for the purpose of increasing the resistivity thereof.
- the hot rolling operation is eliminated and a high yield in dust is secured by roducing a fine grained brittle structure irectl in the casting, thereby permitting the br 'ng up of the castings themselves without any intervemng hot rolling.
- This is accomplished by the addition of the amounts stated of one or more of the following elements to the molten magnetic material: tin in percentages of 1 to 4%; bismuth in percentages of to 4% and lead in percentages of to 4%. Percentages up to 6% may be employed, but larger quantities do not give an improvement over results obtained with smaller quantities.
- the additionto and thorough mixing of these ingredients with the molten magnetic compositions has a two-fold beneficial First, the addition agents tend during the solidification of the castin thus producing a fine grain structure.
- Method of increasing the yield of fine dust resulting from reducing magnetic materials of the iron-nickel or iron-nickel-cobalt type to finely divided form, which meth- 1 od comprises embodyingin said material a quantity greater than an impurity, but not exceeding about 6%, of one or more of the following elements: tin, bismuth, lead.
- Magnetic material of the iron-nickel or iron-nickel-cobalt type having added to it resistivity increasing material selected from such elements as chromium, molybdenum, or
- tungsten characterized in this that material composed of the following elements is added to embrittle the magnetic material: tin, bismuth, or lead.
Landscapes
- Soft Magnetic Materials (AREA)
Description
Patented Feb; 3, 1931 UNITED S ATES PATEN'P OFFICE JAMES E. HARRIS, 01' NEWARK, NEW- JERSEY, ABBIGNOB '10 BELL TELEPHONE LAB- ORATORIES, INCORPORATED, 01 NEW YORK, N. Y., A CORPORATION 01' NEW YORK No Drawing.
The present invention relates to the production of magnetic materials and particularly to a method for producing such materials in finely divided form.
An ob'ect of the invention is to facilitate the pro uction of finely divided magnetic materials such as are used in loading coils and other cores.
Another object of the invention is to so 19 condition various magnetic materials such as, for instance, alloys of iron and nickel containing about 78 nickel and the balance iron plus molybdenum, and alloys of iron,
nickel and cobalt containing about 45% nickel, cobalt and the balance iron, or
iron plus molybdenum, so that these materials may be more easily produced in finely divided form.
A further objectof the invention is to ingo crease the yield of finely divided dust resulting from working the alloys mentioned in finely divided form.
The invention is of particular advantage in the manufacture of magnetic loading coil 25 cores in which the core is composed of finelydivided magnetic material, usually referred toas dust. It has been customary to hot roll cast billets of these materials preliminary to the comminuting operation in order to break' so up and transform the cast grain structure which is usually characterized by large primary crystals.
Iron-nickel alloys have their magnetic and electrical properties beneficially improved by the addition of such elements as cobalt or molybdenum but they are more difficult to reduce to dust of the fineness required for dust core coils when such elements are present. In the manufacture of magnetic cores with cobalt as a. constituent element it is difficult to secure a high yield of dust in finely divided form by the usual hot rolling methods. This detrimental effect of cobalt is particularly noticeable and is perhaps enhanced by the resence of elements such as molybdenum, c romium or tungsten, and perhaps others which may be added tomagnetic materials of this type for the purpose of increasing the resistivity thereof.
In accordance with the present invention influence. to prevent the grains from growing too freely Application filed amen 24,1930. mm llo. 438,681.
the hot rolling operation is eliminated and a high yield in dust is secured by roducing a fine grained brittle structure irectl in the casting, thereby permitting the br 'ng up of the castings themselves without any intervemng hot rolling. This is accomplished by the addition of the amounts stated of one or more of the following elements to the molten magnetic material: tin in percentages of 1 to 4%; bismuth in percentages of to 4% and lead in percentages of to 4%. Percentages up to 6% may be employed, but larger quantities do not give an improvement over results obtained with smaller quantities. The additionto and thorough mixing of these ingredients with the molten magnetic compositions has a two-fold beneficial First, the addition agents tend during the solidification of the castin thus producing a fine grain structure. econd, they create incipient points, lines or surfaces of weakness in the surface area of the grains, in that they tend to form inherently brittle combination (or other) products with the matrix of the material, which segregate at the grain boundaries and enable an easy disruption of the crystal structure under the influence of mechanical comminuting agents. Regardless of what the scientific reason may be, the increase of yield of fine dust is a definite experimental fact. In one embodiment of this invention a magnetic composition containing approximately 25% cobalt, 27% iron, nickel, 3% tin and bismuth, after being comminuted in a ball mill, was found to have a yield in dust passing 120 meshes per square inch of about 90.8%.
In another embodiment of this invention a magnetic composition containing ap proximately 25% cobalt, 26% iron, 25% nickel, 4% molybdenum, and 4% lead, comminuted in the same manner, produced a yield of dust inch of 90.6%.
What is claimed is:
1. The method of increasing the yield of fine dust resulting from reducing magnetic materials to finely divided form, which compassing 120 meshes per square prises melting said materials with a quantity greater than an incidental impurity and up to several percent of material composed of one or more of the following elements: tin,
. 5 bismuth, lead.
2. Method of increasing the yield of fine dust resulting from reducing magnetic materials of the iron-nickel or iron-nickel-cobalt type to finely divided form, which meth- 1 od comprises embodyingin said material a quantity greater than an impurity, but not exceeding about 6%, of one or more of the following elements: tin, bismuth, lead.
3. Magnetic material of the iron-nickel or iron-nickel-cobalt type, having added to it resistivity increasing material selected from such elements as chromium, molybdenum, or
tungsten, characterized in this that material composed of the following elements is added to embrittle the magnetic material: tin, bismuth, or lead.
In witness whereof, I hereunto subscribe my name this 20th day of March, 1930.
JAMES E. HARRIS.
Publications (1)
Publication Number | Publication Date |
---|---|
US1790704A true US1790704A (en) | 1931-02-03 |
Family
ID=3420980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US1790704D Expired - Lifetime US1790704A (en) | Obatobieb |
Country Status (1)
Country | Link |
---|---|
US (1) | US1790704A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2589766A (en) * | 1945-05-04 | 1952-03-18 | Bradley Evelyn | Magnetic oil seal construction |
US2816053A (en) * | 1954-04-08 | 1957-12-10 | Yale & Towne Mfg Co | Powdered metal magnet with low residual characteristics |
US3863318A (en) * | 1972-03-06 | 1975-02-04 | Toyota Motor Co Ltd | High temperature-resistant wearproof sintered alloys |
EP0062221A2 (en) * | 1981-04-07 | 1982-10-13 | Eckart-Werke Standard Bronzepulver-Werke Carl Eckart Gmbh & Co. | Process for producing a metal powder or metal alloy powder |
-
0
- US US1790704D patent/US1790704A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2589766A (en) * | 1945-05-04 | 1952-03-18 | Bradley Evelyn | Magnetic oil seal construction |
US2816053A (en) * | 1954-04-08 | 1957-12-10 | Yale & Towne Mfg Co | Powdered metal magnet with low residual characteristics |
US3863318A (en) * | 1972-03-06 | 1975-02-04 | Toyota Motor Co Ltd | High temperature-resistant wearproof sintered alloys |
EP0062221A2 (en) * | 1981-04-07 | 1982-10-13 | Eckart-Werke Standard Bronzepulver-Werke Carl Eckart Gmbh & Co. | Process for producing a metal powder or metal alloy powder |
EP0062221A3 (en) * | 1981-04-07 | 1983-03-30 | Eckart-Werke Standard-Bronzepulver-Werke Carl Eckart | Process for producing a metal powder or metal alloy powder |
EP0152522A2 (en) * | 1981-04-07 | 1985-08-28 | Eckart-Werke Standard Bronzepulver-Werke Carl Eckart Gmbh & Co. | Process for producing a metal powder or metal alloy powder |
EP0152522A3 (en) * | 1981-04-07 | 1985-10-09 | Eckart-Werke Standard-Bronzepulver-Werke Carl Eckart | Process for producing a metal powder or metal alloy powder |
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