MANUFACTURING METHOD OF CAST-IRON FRICTION MEMBER

摘要

A cast-iron friction member is manufactured by: performing a nitrocarburizing treatment on a cast workpiece at a treatment temperature of 500� C. to 600� C. to thus form a nitrogen compound layer on a surface of the workpiece; and exposing the workpiece to an atmosphere when a temperature becomes 400� C. to 480� C. after the nitrocarburizing treatment so as to cool the workpiece to a room temperature while keeping a contact state with oxygen to thus form an iron oxide layer including Fe3O4 on a surface of the nitrogen compound layer.