Abstract
The Fe–Si–Cr alloy powders were successfully modified by using the phosphatizing and sodium silicate coating processes. The optimized surface pre-treatment for Fe–Si–Cr powder was phosphatized in 2wt.% phosphoric solution and further treated with 4wt.% sodium silicate solution at 75°C for 30min. These treatments increased the high-frequency stability for Fe–Si–Cr alloy powders, and the annealed cores further showed the enhanced performance of permeability, impedance, quality factor and anti-corrosion ability. Comparing with the Fe–Si–Al alloy, the Fe–Si–Cr also showed a superior performance in density, moldability and saturated magnetic induction.
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