METHOD FOR MANUFACTURING OF INSULATED SOFT MAGNETIC METAL POWDER FORMED BODY

摘要

PROBLEM: PROVIDING A METHOD FOR MANUFACTURING BODIES FORMED FROM INSULATED SOFT MAGNETIC METAL POWDER THAT ARE LOW IN IRON LOSS AND HIGH IN MAGNETIC PERMEABILITY SOLUTION: A METHOD FOR MANUFACTURING BODIES FORMED FROM INSULATED SOFT MAGNETIC METAL POWDER BY FORMING AN INSULATING FILM OF AN INORGANIC SUBSTANCE ON THE SURFACE OF PARTICLES OF A SOFT MAGNETIC METAL POWDER, COMPACTING AND MOLDING THE POWDER, THEN CARRYING OUT A HEAT TREATMENT TO PROVIDE A BODY FORMED FROM INSULATED SOFT MAGNETIC METAL POWDER THE METHOD COMPRISING: COMPACTING AND MOLDING THE POWDER; THEN MAGNETICALLY ANNEALING THE POWDER AT A HIGH TEMPERATURE ABOVE THE CURIE TEMPERATURE FOR THE SOFT MAGNETIC METAL POWDER AND BELOW THE THRESHOLD TEMPERATURE AT WHICH THE INSULATING FILM IS DESTROYED IN A NON-OXIDIZING ATMOSPHERE, SUCH AS A VACUUM, INERT GAS,OR THE LIKE; AND THEN CARRYING OUT A FURTHER HEAT TREATMENT AT A TEMPERATURE OF FROM 400 DEG C TO 700 DEG C IN AN OXIDIZING ATMOSPHERE, SUCH AS AIR, OR THE LIKE.