Development of High Strength and Low Iron Loss Powder Magnetic Core by Adding Glass Powder

Powder magnetic cores used in reactors are required to have low iron loss, and alloy materials are used as low iron loss powder magnetic core materials. However, powder cores made from alloy materials have the issue of low strength, so we have been investigating the method of adding low-melting-point glass powder to improve strength. Although the strength of powder cores improved when glass powder was added, it significantly worsens iron loss, and we found that the sodium contained in the glass cause it. The sodium contained in the glass destroys the insulating coating of metal particles, which is one of the factors that increases iron loss when glass is added.