| 摘要 |
PROBLEM TO BE SOLVED: To provide a core material of electrophotographic ferrite carrier which has a high degree of fluidity, has little variation of magnetization, is highly magnetized and is spherical, and to provide a method of manufacturing resin coated ferrite carrier with excellent cost efficiency and high production stability. SOLUTION: In the method, a raw powder with an average particle size of 20 to 50μm obtained by preparing raw material for ferrite is charged into combustion flame along with a carrier gas for the raw powder, is thermally sprayed in atmospheric air and is ferritized, subsequently, the thermally-sprayed particles are rapidly solidified, and the solidified particles are captured and recovered. The method satisfies the conditions comprising the following (1) to (3): (1) a mixture gas of propane and oxygen having a volumetric ratio of propane to oxygen of 1:3.5 to 6.0 is used as the combustion flame for the thermal spraying; (2) the carrier gas for the raw powder is air, nitrogen, oxygen or a mixture gas thereof, and the ratio of (a/b) of a charged amount (a) (kg/hr) of the raw powder to a charged amount (b) (kg/hr) of the carrier gas for the raw powder is 4.8 or less; and (3) a flame flow velocity of the combustion flame is 6.5 to 125 m/sec. COPYRIGHT: (C)2008,JPO&INPIT
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