US2149782A - Magnetizable fluid - Google Patents
Magnetizable fluid Download PDFInfo
- Publication number
- US2149782A US2149782A US2149782DA US2149782A US 2149782 A US2149782 A US 2149782A US 2149782D A US2149782D A US 2149782DA US 2149782 A US2149782 A US 2149782A
- Authority
- US
- United States
- Prior art keywords
- fluid
- steel
- mercury
- magnetizable
- magnetizable fluid
- 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
- 239000012530 fluid Substances 0.000 title description 38
- 229910000831 Steel Inorganic materials 0.000 description 26
- 239000010959 steel Substances 0.000 description 26
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 24
- 229910052753 mercury Inorganic materials 0.000 description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910002804 graphite Inorganic materials 0.000 description 12
- 239000010439 graphite Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 239000000428 dust Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 2
- 230000001747 exhibiting Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000001050 lubricating Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
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
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
- H01F1/442—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a metal or alloy, e.g. Fe
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C7/00—Alloys based on mercury
Definitions
- My invention relates generally to magnetizable fluid and particularly to a magnetizable mercury indicating fluid for use in measuring and gauging instruments and in industry wherever a magnetizable fluid may be employed, and an important object of my invention is to provide a fluid of this character which is in a practical and eflicient form and which is relatively stable.
- the present invention provides a fluid which can be moved, distorted and otherwise modified as to volumetric shape and position by the impressing thereon of magnetic lines of force such as are prevalent in the magnetic field of a permanent magnet or of an electromagnet.
- the fluid of the present invention may be caused to rise for indicating and measuring purposes in a tube by placing a suitable magnet around or in the tube above or at an upper part of the column of fluid.
- the magnetizable fluid of the present invention is made up of mercury (quicksilver),
- the steel dust when thoroughly mixed with the mercury becomes suspended and dispersed therein in such a way that when the magnetic field of a permanent magnet or of an electromagnet is brought to bear on the fluid, the steel particles will in moving toward the magnet carry the mercury along with them.
- the steel "dust or powder particles must be sufllciently small to remain dispersed in suspension in the mercury and be of a sufliciently high grade of steel to be 1 sufliciently highly magnetically permeable and exhibit a minimum of residual magnetism.
- powdered graphite is also made an in- 5 gredient of the fluid.
- the graphite acts to procure and maintain the uniform dispersion and suspension of the steel particles throughout the mercury.
- the mercury clings to the particles of powdered graphite, and prevents the steel particles from classifying. 5
- a preferred embodiment of the present inven- 10 tion is composed of:
- a magnetically responsive fluid of the character described comprising approximately from 2 to 14 percent by volume of steel dust, 3 percent byvolume of powdered graphite, and from 83 to percent by volume of quick- 30 silver.
Description
Patented Mar. 7, 1939 UNITED STATES PATENT OFFICE MAGNETIZABLE FLUID Albany, N. Y
No Drawing. Application March 17, 1937,
Serial No. 131,536
4 Claims.
My invention relates generally to magnetizable fluid and particularly to a magnetizable mercury indicating fluid for use in measuring and gauging instruments and in industry wherever a magnetizable fluid may be employed, and an important object of my invention is to provide a fluid of this character which is in a practical and eflicient form and which is relatively stable.
Other important objects of my invention will be apparent from a reading of the following description and example furnished for illustrative purposes.
The present invention provides a fluid which can be moved, distorted and otherwise modified as to volumetric shape and position by the impressing thereon of magnetic lines of force such as are prevalent in the magnetic field of a permanent magnet or of an electromagnet. For instance, the fluid of the present invention may be caused to rise for indicating and measuring purposes in a tube by placing a suitable magnet around or in the tube above or at an upper part of the column of fluid.
The magnetizable fluid of the present invention is made up of mercury (quicksilver),
steel dust or filings or steel powder, and powdered graphite.
The steel dust when thoroughly mixed with the mercury becomes suspended and dispersed therein in such a way that when the magnetic field of a permanent magnet or of an electromagnet is brought to bear on the fluid, the steel particles will in moving toward the magnet carry the mercury along with them. The steel "dust or powder particles must be sufllciently small to remain dispersed in suspension in the mercury and be of a sufliciently high grade of steel to be 1 sufliciently highly magnetically permeable and exhibit a minimum of residual magnetism.
In order to sufficiently lubricate the mercury and steel particles to provide for desired ease of movement of the fluid in its container and to add to the magnetically sensitive character of the fluid, powdered graphite is also made an in- 5 gredient of the fluid.
In addition to exhibiting lubricating properties the graphite acts to procure and maintain the uniform dispersion and suspension of the steel particles throughout the mercury. The mercury clings to the particles of powdered graphite, and prevents the steel particles from classifying. 5
Experiment shows that not more than 14% by volume of steel filings can be suspended by mercury in the present fluid and as little as 2% by volume of steel filings is eflective.
A preferred embodiment of the present inven- 10 tion is composed of:
Per cent by volume Steel dust 14 Powdered graphite 3 15 Mercury (quicksilver) 83 Although I have shown and described herein a preferred embodiment of my invention it is to be definitely understood that I do not desire to limit the application of the invention thereto, and any change or changes may be made in the ingredients and in the manner in which the same are assembled together, within the spirit of the invention and the scope of the subjoined claims.
What is claimed is:
1. A magnetically responsive fluid of the character described, said fluid comprising approximately from 2 to 14 percent by volume of steel dust, 3 percent byvolume of powdered graphite, and from 83 to percent by volume of quick- 30 silver.
2. A magnetically responsive fluid of the character described, said fluid consisting of substan-
Publications (1)
Publication Number | Publication Date |
---|---|
US2149782A true US2149782A (en) | 1939-03-07 |
Family
ID=3430019
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US2149782D Expired - Lifetime US2149782A (en) | Magnetizable fluid |
Country Status (1)
Country | Link |
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US (1) | US2149782A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2500953A (en) * | 1948-09-24 | 1950-03-21 | Max L Libman | Magnetoresistor |
US2744223A (en) * | 1950-11-09 | 1956-05-01 | Bailey Meter Co | Servo system, including electrical inverter circuit |
US2751352A (en) * | 1951-08-23 | 1956-06-19 | Shell Dev | Magnetic fluids |
US2896758A (en) * | 1954-09-24 | 1959-07-28 | Eaton Mfg Co | Magnetic clutch |
DE973130C (en) * | 1947-10-31 | 1959-12-03 | Eaton Mfg Co | Magnetizable substance made of ferromagnetic particles and their use for the transmission or absorption of mechanical energy |
US2983349A (en) * | 1957-10-17 | 1961-05-09 | Gen Electric | Magnetic clutch |
US3289126A (en) * | 1963-01-10 | 1966-11-29 | Fifth Dimension Inc | Mercury switch employing magnetizable fluid |
US5034054A (en) * | 1989-07-03 | 1991-07-23 | Ecoflo, Inc. | Process for treating mercury in preparation for disposal |
-
0
- US US2149782D patent/US2149782A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE973130C (en) * | 1947-10-31 | 1959-12-03 | Eaton Mfg Co | Magnetizable substance made of ferromagnetic particles and their use for the transmission or absorption of mechanical energy |
US2500953A (en) * | 1948-09-24 | 1950-03-21 | Max L Libman | Magnetoresistor |
US2744223A (en) * | 1950-11-09 | 1956-05-01 | Bailey Meter Co | Servo system, including electrical inverter circuit |
US2751352A (en) * | 1951-08-23 | 1956-06-19 | Shell Dev | Magnetic fluids |
US2896758A (en) * | 1954-09-24 | 1959-07-28 | Eaton Mfg Co | Magnetic clutch |
US2983349A (en) * | 1957-10-17 | 1961-05-09 | Gen Electric | Magnetic clutch |
US3289126A (en) * | 1963-01-10 | 1966-11-29 | Fifth Dimension Inc | Mercury switch employing magnetizable fluid |
US5034054A (en) * | 1989-07-03 | 1991-07-23 | Ecoflo, Inc. | Process for treating mercury in preparation for disposal |
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