Magnetic and Thermal Properties of Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 Amorphous Ribbon and Ball-Milled Powders

Abstract

This paper reports magnetic and thermal properties of Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 amorphous ribbon and its powders prepared by ball milling. Differential thermal analysis of the amorphous ribbon showed its Curie temperature at 400 °C, and two crystalline peaks at 500 and 550 °C, respectively. X-ray diffraction analysis demonstrated that a secondary phase Fe 2 B appeared at 500 °C, causing a maximum strain of 0.195 % in the ribbon at 600 °C. The optimized soft magnetic properties of Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 ribbon were found in the sample annealed at 450 °C, with saturation magnetization B m = 1.84×104 G and coercivity H c = 17.95 Oe. After ball milling, the Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 powders reached a mean particle size of 10 μm, with partial crystallization during the ball milling process. The ball milling decreased B m while increased H c , due to anisotropy induced by stress.