HIGH-DENSITY FERRITE

• Main Authors: YUGUCHI AKIYO, TOMITA MITSURU, KAWASAKI TOSHIHARU
• Format: Patent
• Language: English
• Published: 02.12.1994
• Edition: 5
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; CONCRETE; ELECTRICITY; INDUCTANCES; INORGANIC CHEMISTRY; LIME, MAGNESIA; MAGNETS; METALLURGY; REFRACTORIES; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SLAG; TRANSFORMERS; TREATMENT OF NATURAL STONE

PURPOSE:To provide a high-density Mn-Zn ferrite suitable for magnetic heads containing lots of Fe2O3, which does not deteriorate in permeability and coercive force during machining, heat treatments or operation in the form of a magnetic head. CONSTITUTION:A high-density ferrite contains 62-68mol.% Fe2O3, 16-28mol.% MnO, 10-16mol.% Cod, and an additive including any of CaO, SiO2, ZrO2 and CoO. The ferrite has a temperature coefficient of permeability in which the second peak falls between 10 and 30 deg.C. As a result, it is possible to prevent the deterioration of initial permeability and coercive force at high frequency due to residual stresses and ambient temperature. This high-density ferrite has a high saturation flux density and a stable, high initial permeability in a high frequency region.