Effect of Silicon on Magnetic Behavior of Powder Metallurgically Processed Fe-P Alloys

摘要

Iron-Phosphorus based alloys are known for hot shortness and are therefore not considered suitable for high temperature working. The present investigation deals with the development of high density Fe-P based alloys in the form of very thin sheets (0.1mm) by proper soaking them at high temperature to eliminate Iron- Phosphide eutectic and bring entire phosphorus into solution in iron. It has also been possible to eliminate the use of hydrogen atmosphere during sintering by the use of carbon to form CO gas within the compact by reacting with oxygen of iron powder particles. The glassy ceramic coating applied over the compact serves as protective coating to avoid atmospheric oxygen attack over the compact held at high temperature. Fe-0.3wt% P-0.5wt% Si alloy so formed yielded coercivity as low as 0.39 Oe, resistivity as high as 31.7 μΩcm and total loss as low as 0.129 W/Kg. Such a combination of properties may suit their application in magnetic relays and transformer cores.