US1698300A - Method of manufacturing composite metal bodies - Google Patents
Method of manufacturing composite metal bodies Download PDFInfo
- Publication number
- US1698300A US1698300A US166802A US16680227A US1698300A US 1698300 A US1698300 A US 1698300A US 166802 A US166802 A US 166802A US 16680227 A US16680227 A US 16680227A US 1698300 A US1698300 A US 1698300A
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- US
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- Prior art keywords
- pressure
- density
- composite metal
- metal bodies
- manufacturing composite
- 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.)
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- 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
Definitions
- My invention relates to the manufacture of bodies of compressed particles of electrically conductive or magnetic material
- the object of my invention is to provide a method of conducting the pressing operation whereby the properties of the compressed articles will be independent to a large extent of the variations in the processes of pressing which are employed.
- My invention depends upon the discovery of the fact that a point of substantially constant density exists when pulverized material is pressed; that is, when the pressing operation is carried to a certain point the density of the compressed body will be substantially constant over quite a wide range in the pressure employed. For example, if a powder in a mold is'gradually 'pressed with a hydraulic press beginning with zero pressure, the density of the pressedbody first increases rapidly with increasing pressure, it then increases more slowly, and finally remains constant up to a certain pressure. The increase of the density or the decrease of volume is caused in this instance by the shifting of the individualparticles with respect to one another. Until the minimum of volume is reached,-the increase of the pressure will not cause any appreciable increase in the density.
- bodies of pressed powdered. material which consists in applying to a mass of powdered material a pressure ofa value within a range over which the density is substantially independa pressure of a value within a range over ent of the pressure, and below pressures at which appreciable difierences of pressure which a further increase in density will be produce no appreciable. change in the elec- 0 produced. trical and magnetic properties of the body.
Description
Jan. 8, 1929., 1,698,300
W. EH LERS METHOD Off MANUFACTURING COMPOSITE METAL BODIES Filed Feb. 8.,.1927' I'nv ehtQT: Walther" Ehl'er's,
His Attorney Patented Jan. 8, 1 929.
UNITED STATES PATENT ori ice.
WALTHER EHLEBS, or 'corENIcx-BEnLm. GERMANY, ASSIGNOR TO GENERAL fELEczrrarc COMPANY, A conrormrron 0F-NEW YORK.
METHOD OF MANUFACTUQRING COMPOSITE METAL BODIES.
Application filed February 8, 1927, Serial No. 166,802,,ai1d in Germany July 15, 1926.
My invention relates to the manufacture of bodies of compressed particles of electrically conductive or magnetic material,
press employed, the different speeds use for compressing the time consumed with the pressing operation, and the degree of skill of the workman.
The object of my invention is to provide a method of conducting the pressing operation whereby the properties of the compressed articles will be independent to a large extent of the variations in the processes of pressing which are employed.
My invention depends upon the discovery of the fact that a point of substantially constant density exists when pulverized material is pressed; that is, when the pressing operation is carried to a certain point the density of the compressed body will be substantially constant over quite a wide range in the pressure employed. For example, if a powder in a mold is'gradually 'pressed with a hydraulic press beginning with zero pressure, the density of the pressedbody first increases rapidly with increasing pressure, it then increases more slowly, and finally remains constant up to a certain pressure. The increase of the density or the decrease of volume is caused in this instance by the shifting of the individualparticles with respect to one another. Until the minimum of volume is reached,-the increase of the pressure will not cause any appreciable increase in the density.
In the accompan ing drawing, I have indicated a curve s owing the relation between density and pressure, the density being'represented by the ordinates and the pressure b abscissae It will e seen from this curve that the density of the body gradually increases with increase of pressure until a pressure corresponding to P; is reached; The density then remains substantially constant over the range K until the pressure corresponding to P is reached. If beyond this pointthe pressure is increased to very high values the density of the body increases and approaches asymptotically the density S,., which represents the density of the particles of whichthe body is composed.
If in the case illustrated, a pressure corresponding to P is chosen as the pressure,
7 will be. suflicient.
Attempts have been made in the past to manufacture pressed bodies with uniform characteristics which would be little dependent on the variation of pressure by choosing a range of pressure at a point where the DP approaches asymptotically the limiting value S... This process, however, requires the application of exceptionally high pressures whlch should be avoided as far as possible in view of the technical difliculties of producing such high pressures, such for example, as producing molds of sufficient strength. It-will also be' found frequently that the characteristics of the compressed body are less desirable due to the greatdeformation of the powdered particles. Moreover, in.- this part of the curve the density only is comparatively independent of the pressure, while the magnetic and electrical properties of the compressed body are not independent of the pressure. What Iv laim as new and desire to secure by Letters Patentf'of the United States, is:'
constructing bodies of pressed powdered. material which consists in applying to a mass of powdered material a pressure ofa value within a range over which the density is substantially independa pressure of a value within a range over ent of the pressure, and below pressures at which appreciable difierences of pressure which a further increase in density will be produce no appreciable. change in the elec- 0 produced. trical and magnetic properties of the body.
5 3. The method of constructing bodies of In Witness whereof, I have hereunto set pressed magnetic material which consists in my hand this 17th day of January 1927. applying to a mass of powdered material WALTHER EHLERS.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1698300X | 1926-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1698300A true US1698300A (en) | 1929-01-08 |
Family
ID=7739774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US166802A Expired - Lifetime US1698300A (en) | 1926-07-15 | 1927-02-08 | Method of manufacturing composite metal bodies |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1698300A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2818339A (en) * | 1955-02-28 | 1957-12-31 | Harry W Dodds | Method for producing malleable and ductile beryllium bodies |
| US2885287A (en) * | 1954-07-14 | 1959-05-05 | Harold F Larson | Method of forming elongated compacts |
| US3036910A (en) * | 1958-03-13 | 1962-05-29 | Walter W Eichenberger | Synthetic ferro-titanium briquette |
| US3215615A (en) * | 1951-05-04 | 1965-11-02 | British Aluminium Co Ltd | Current conducting element for aluminum production cells |
| US3644216A (en) * | 1963-07-24 | 1972-02-22 | Ugine Kuhlmann | Catalysts |
-
1927
- 1927-02-08 US US166802A patent/US1698300A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3215615A (en) * | 1951-05-04 | 1965-11-02 | British Aluminium Co Ltd | Current conducting element for aluminum production cells |
| US2885287A (en) * | 1954-07-14 | 1959-05-05 | Harold F Larson | Method of forming elongated compacts |
| US2818339A (en) * | 1955-02-28 | 1957-12-31 | Harry W Dodds | Method for producing malleable and ductile beryllium bodies |
| US3036910A (en) * | 1958-03-13 | 1962-05-29 | Walter W Eichenberger | Synthetic ferro-titanium briquette |
| US3644216A (en) * | 1963-07-24 | 1972-02-22 | Ugine Kuhlmann | Catalysts |
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