BOUWL-SHAPED FERROMAGNETIC MATERIAL ESSENTRALLY CONSUBTING OF IRON-CONTAINED CHROMIUM DIOXIDE

PURPOSE: To obtain needle-like ferromagnetic chromium dioxide material showing high coercive force field strength and a high saturation magnetization value by a method wherein water-containing chrome acid chrome III is heated up to the temperature of 200 to 500 deg.C in a high pressure reactor, and...

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Hauptverfasser:	MIHIYAERU BUORUFUGANGU MIYURAA, ETSUKEHARUTO SHIYUBUAPU, NORUBERUTO MIYURAA, RAINAA FUEZAA, HERUMUUTO AUBUETAA, MANFUREETO OORINGAA, RUDEI REENERUTO
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CORRECTING FLUIDS DYES ELECTRICITY FILLING PASTES INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS INORGANIC CHEMISTRY MAGNETS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PURPOSE: To obtain needle-like ferromagnetic chromium dioxide material showing high coercive force field strength and a high saturation magnetization value by a method wherein water-containing chrome acid chrome III is heated up to the temperature of 200 to 500 deg.C in a high pressure reactor, and immediately after reaction to this temperature, the material is cooled down and the pressure of the high pressure reactor is relaxed. CONSTITUTION: Hydrous chrome acid chrome III, having the degree of hydration n of at leas 13 in the form of Cr2 (CrO4 )3 .nH2 O is decomposed at the temperature of 200 to 500 deg.C under the pressure of 50 to 700var. To be more precise, the hydrous chrome acid chrome III is heated up to 200 to 500 deg.C in a high pressure reactor, and after said temperature is attained, the material is cooled down immediately and the pressure of the reactor is relaxed. Accordingly, in the needle-like ferromagnetic material consisting of iron-containing chromium dioxide and containing the indium smaller than 2ppm and the cobalt smaller than 50ppm as the component of chromium dioxide, upon measurement in a magnetic field of 380kA/m, a ferromagnetic material, having a coercive field intensity higher than 61kA/m, can be obtained when a magnetizing operation of 70nTm /g or higher is conducted.