HIGH-STRENGTH LOW-LOSS COMPOSITE SOFT MAGNETIC MATERIAL, GEOPOLYMER COATED METAL POWDER, ELECTROMAGNETIC CIRCUIT PART, AND METHOD FOR MANUFACTURING HIGH-STRENGTH LOW-LOSS COMPOSITE SOFT MAGNETIC MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a soft magnetic material which has high specific resistance and strength, is strong against moisture, and keeps high strength for a long period of time.SOLUTION: In the high-strength low-loss composite soft magnetic material, soft magnetic particles are bound by a grain boundary layer consisting of geopolymer which is formed as a polycondensate of aluminium oxide and a silicon oxide, and electrically insulated from each other. It is preferred that the grain boundary layer consisting of geopolymer, contains 2 mol%to 7 mol% of alkali metal atoms. It is preferred that the percentage of total of the grain boundary layer consisting of geopolymer, is 0.5 mass% to 3 mass%.