PURPOSE: To obtain the iron nitride high density sintered product excellent in magnetic characteristics, weather resistance, strength, etc., by nitriding the powder of iron (alloy), coating the obtained magnetic particles with a ceramic material, compacting the coated particles, and subsequently sintering the compacted product.
CONSTITUTION: Iron powder or iron alloy powder (e.g. Fe-Ni alloy) is nitrided by a gas nitriding method, an ion nitriding method, etc., to produce magnetic particles comprising particles consisting mainly of Fe4N or Fe16N2 or particles whose inner parts consists mainly of the Fe or the Fe alloy and whose outer peripheral parts consist mainly of the Fe4N or Fe16N2. The nitrided magnetic particles are coated with a ceramic material by a CVD method, a plating method, etc., compacted and subsequently sintered. Or, the powder of the nitrided magnetic particle and the powder of an insulating ceramic material are mixed with each other, compacted, and subsequently sintered. Thereby, the iron nitride high density sintered product comprising the composite sintered product in which the nitrided magnetic particles are dispersed in the matrix of the insulating ceramic material and which is suitable as an alternate material for compacted magnetic cores is provided.
NAKANO KOICHIRO
SAKAMOTO NOBORU
YAMAMOTO NAOKI
OTA JUN
