新規リン酸塩系絶縁皮膜で被覆された鉄粉から作製した高密度圧粉磁心(HDMC)の特性

概要

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We have developed new powder magnetic core, which was named HDMC (High Density Magnetic Composite), with high density, high magnetic flux density and high strength. However, the HDMC, which was fabricated from iron particles coated with phosphate glass insulator, has large eddy current loss under high frequency because the resistivity was small (<10 μΩm). To solve the deficiency, new type phosphate glass insulator was developed. The phosphate glass insulator with Sr2+ or Y3+ was found to have high resistivity above 50 μΩm in keeping the high magnetic flux density and strength of the HDMC. The HDMC, whose starting material was iron particles coated with strontium phosphate glass insulator, compacted at 1176 MPa with heat treatment at 673 K had properties as follows; d = 7.70 Mg/m3, μm = 610, B5k = 1.51T, B10k = 1.71T, bHc = 300 A/m, resistivity = 100 μΩm, TRS = 180 MPa, iron loss (Bmax = 1T, f = 400 Hz) = 400 kW/m3.
社団法人粉体粉末冶金協会の論文
2005-03-15