SINTERED PARTICLE AND CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPERS, DEVELOPER FOR ELECTROPHOTOGRAPHIES USING THE SAME, AND PRODUCING METHOD OF SINTERED PARTICLE SINTERING PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide sintered particle in which breaking and chipping are hardly generated even in the long term use and which is excellent in durability and a method for producing the same.

SOLUTION: The sintered particle contains metal iron and Fe3O4as main components and has a void ratio of 5% or less. It is preferable that the ratio (I2/I1) of the maximum peak value (I1) of the Fe3O4and the maximum peak value (I2) of the metal iron is 0.05 to 0.70 by powder X-ray diffraction method from a standpoint for further improving the mechanical strength of the sintered particle. Further it is preferable that a specific surface area by a BET method is 0.09 m2/g or less and an absolute specific gravity is 4.95 g/cm3or more. Furthermore, it is preferable that a saturated magnetization is in a range of 70-120 Am2/kg.

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