MIMプロセスによって作製した高硬度Fe-Cr-Si系軟磁性材料の磁気特性および機械的性質

Abstract

An electronic fuel injection system of automobiles have been commercialized at the end of 1960’s, they have been adopted as environmental measures for many automobiles and motorcycles. In recent years, metal injection molding (MIM) has been adopted as a process for manufacturing a solenoid valve which is a component of an electronic fuel injector, and PB permalloy components have been commercialized. However, Ni, an element of PB permalloy, is expensive material, making it difficult to produce the fuel injector component at a low cost. As a solution to this problem, we studied the magnetic and material properties of Fe-Cr-Si and Fe-Cr-Si-Mo alloys by MIM process. These results revealed that the magnetic and mechanical properties were improved by reducing Cr content, and the corrosion resistance were improved by adding Mo even if the amount of Cr reduced. On the other hand, we found that the hardness of these alloys increased by adding Si and Mo. In this study, Fe-Cr-Si alloy specimens containing Si and Mo to increase hardness are manufactured by MIM process, and we investigated the magnetic and mechanical properties. These results revealed that Fe-12Cr-4.5Si-2Mo alloy is a material with excellent magnetic and mechanical properties.