Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D1/00—Electroforming
  • C25D1/04—Wires; Strips; Foils
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D1/00—Electroforming
  • C25D1/20—Separation of the formed objects from the electrodes with no destruction of said electrodes
• • 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
• • 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
  • H01F1/16—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 sheets
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment

Definitions

• This invention relates to magnetic materials and more particularly to sheet materials of low coercivity suitable for the laminated cores of transformers, motors and generators.
• the object of this invention is to provide an improved method of electrolytically producing sheets of magnetic material in which the majority of the crystals are aligned so as to have two cube edges (100) directions parallel or nearly parallel to two directions at right angles in the plane of the sheet and thus secure further improved magnetic properties.
• a process of producing a sheet of iron according to the present invention consists in preparing a sheet of substrate material having a desired grain-orientation, electrolytically depositing iron on the substrate using an electrolyte offerrous chloride at a temperature of not less than 50 C. and a current density of approximately 1 amp/elm. until a coating of at least .002" has been ob-- tained, and separating the coating from the substrate.
• a process of producing sheets of iron according to a further feature of this invention consists in preparing a sheet of substrate material having desired grain orientation, coating the grain-oriented substrate with a layer of a second metal having a related orientation, electrolytically depositing iron on the coated substrate using an electrolyte of ferrous chloride at a temperature of not less than 50 C. with a current density of approximately 1 ampJdm. until a film of at least .002 has been obtained, removing the coated substrate with the deposited film from the electrolyte and stripping the film-from the substrate by removal of the coating.
• a preferred base for the purpose of the invention is gold, in which cube texture may be developed by, for example, cold-rolling to or more reduction, and annealing at 1000 C. for 1 hour;
• the cube-edge length, an, of gold is within 1% 'of /2 times of iron, so that the pattern of atoms in a cube face of an'iron crystal will fit very closely on that of 'atoms in a cube face-of a gold crystal, but with the cube edge directions at 45 to those of the substrate material.
• copper, iron or a 50/50 nickel-iron alloy can be used as the substrate material.
• the master sheet is covered by electrodeposition with a thin epitaxial layer of a metal with a suitable lattice constant, such as silver or tin, after which the iron deposition is made.
• the iron sheet can then be parted from the master sheet by removing the intermediate metal by melting or other means.
• Tin is a preferred metal because it is cheap and melts at a low temperature. It is suitable because the edge length, a0, of the square face of the tetragonal unit cell of white tin is within 2% of twice the cube edge length of iron.
• a suitable composition of the tin plating solution is 90 g. Na2SnOs.3H2O; 7.5 g. NaOH; to 1000 g. water.
• the cathode current density should be kept small at about 0.1 A./dm. -Tin anodes are used, the solution stirred and the temperature maintained at about 70 C. it is again desirable to limit the evaporation.
• the tin coating may be as thin as 10- cm., which requires a plating time of about an hour.
• Iron may then be deposited on to the tin using the technique described previously and in this way a considerable thickness of deposit can be obtained. With a current density of 1 A./dm. a thickness of 0.005 inch is obtained in approximately 8 hours.
• This iron deposit may be parted from the master either cold or at a temperature at which the tin is fluid. The iron sheet can be detinned if required by exposing the sheet at room temperature to gaseous chlorine for ten minutes.
• a process of producing sheets of iron in which the majority of crystals are aligned to have two cube edges (100) directions substantially at right angles in the plane of the sheets comprising the steps of forming a sheet of substrate material having said grain orientation, electrolytically depositing on the grain oriented substrate a coat ing of a second metal which is removable having a related orientation, electrolytically depositing iron on said coated substrate using an electrolyte of approximately 600 gms. of ferrous chloride, per litre of water and a pH of approximately 1.8 at a temperature of not less than 50 C.
• V w V w
• a process ofrproducingsheets of iron ofa desired grain-orientation which comprises forming a mastersh eet of iron by the process of claim 1 and then repeating the process of said claim using the master sheet so-obtained as the substrate material.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Physics & Mathematics (AREA)
• Power Engineering (AREA)
• Electromagnetism (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Electroplating And Plating Baths Therefor (AREA)
• Electrolytic Production Of Metals (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10190218

Family Applications (1)

Country Status (6)

Cited By (5)

Citations (4)

• 0
  • BE BE522786D patent/BE522786A/xx unknown
• 1952
  • 1952-09-15 GB GB23107/52A patent/GB753455A/en not_active Expired
• 1953
  • 1953-09-01 US US377978A patent/US2792340A/en not_active Expired - Lifetime
  • 1953-09-10 DE DEB27387A patent/DE949268C/de not_active Expired
  • 1953-09-11 FR FR1083276D patent/FR1083276A/fr not_active Expired
  • 1953-09-14 CH CH324205D patent/CH324205A/de unknown

Patent Citations (4)

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