Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
  • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
  • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
  • C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
• • 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
  • H01F1/032—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 hard-magnetic materials
  • H01F1/10—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
  • H01F1/11—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
  • H01F1/113—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent

Definitions

• Our invention relates to an annular magnet core suitable for use as a so-called storage element and to a method of manufacturing such a magnet core.
• Storage elements are generally employed in electronic computers, their utility for this purpose being determined by their so-called pulse characteristics or dynamic characteristics. It is important in this respect that there is a distinct difference between the maximum value, uVl, of the undisturbed l-signal and the maximum value, zlVz, of the disturbed O-signal (for a good storage element, the value uVl and the value rVl, i.e. the maximum value of the disturbed l-signal, differ only slightly from each other. For a description of the values uVl, rVl, and dVz, reference is made to US. Patent 2,988,508).
• a further important pulse characteristic, in this respect is the switching time, T The shorter this switching time, the more rapid is the storage element. In general, there is a tendency to attain minimum values of the switching time.
• Another object of our invention is to provide a magnet core suitable as a storage element having a switching time, T of less than 0.25 ,usec.
• the magnet cores are obtained by sintering a pre-sintered product of a mixture of oxides of copper, iron and manganese, which oxides may be replaced wholly or partly and individually by an equivalent quantity of one or more other compounds of the metal concerned, which can be converted into the oxides concerned during sintering, in which mixture the relative quantities of copper (calculated on CuO), iron calculated on Fe O and manganese (calculated on MnO) are:
• the cores have a rather high coercive force, i.e. up to 6 oersted, due to their small size, i.e. an outer diameter of 0.6 mm. maximum and an inner diameter which is at least half of the outer diameter, this has not been found objectionable.
• the peaking time, T of a magnet core denotes the period of time lying between the instant'when the control-current attains an inensity of 10% of its maximum value and the instant when the output voltage of the l-signal produced by the control-current pulse concerned is at a maximum.
• This peaking time depends, of course, upon the rising time (T,) of the control-current pulse. In expreiments leading to the present invention, this rising time always amount-ed to 0.05 #586.
• This presintered product was reduced to a powder 50 gms. of which was mixed in a mortar with 25 cm. of a 6% solution of polyvinyl alcohol in water until a paste was obtained. At C. this paste was inspissated to a weight of 55 to 59 grns. Then the mass was sieved through different sieves having gradually smaller widths of mesh, i.e.
• the outer diameter of the sintered bodies obtained was 0.540 mm.
• the inner diameter was 0.355 mm.
• the pulse characteristics, measured with a control-current of 750 ma., a pulse duration of 0.450 ,usec, and a rising time of 0.050 ,lLSeC, were as follows:
• a method of manufacturing an annular magnet core having an outer diameter not exceeding 0.6 mm., an inner diameter of at least half the outer diameter, a maximum switching time of 0.25 ,usec, and a value of the quotient uVl with a disturbance ratio of 0.61 comprising the steps forming a finely-divided mixture of about 4 to 6 mol percent of CuO, 38 to 44 mol percent of Fe o and 50 to 58 mol percent of MnO, heating said mixture at a temperature of about 750 C.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Power Engineering (AREA)
• Soft Magnetic Materials (AREA)
• Magnetic Ceramics (AREA)
• Compositions Of Oxide Ceramics (AREA)
• Hard Magnetic Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19754282

Family Applications (1)

Country Status (10)

Cited By (1)

Citations (3)

• 1962
  • 1962-12-13 NL NL286714D patent/NL286714A/xx unknown
• 1963
  • 1963-12-06 US US328503A patent/US3297576A/en not_active Expired - Lifetime
  • 1963-12-07 DE DE19631471341 patent/DE1471341B2/de active Pending
  • 1963-12-10 AT AT988463A patent/AT241865B/de active
  • 1963-12-10 GB GB48740/63A patent/GB1060609A/en not_active Expired
  • 1963-12-10 DK DK575463AA patent/DK116383B/da unknown
  • 1963-12-10 CH CH1509163A patent/CH453514A/de unknown
  • 1963-12-11 BE BE641145D patent/BE641145A/xx unknown
  • 1963-12-11 ES ES0294384A patent/ES294384A1/es not_active Expired
  • 1963-12-12 FR FR956999A patent/FR1382406A/fr not_active Expired

Patent Citations (3)

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