Abstract
Studies on magnetic properties of intermetallic compounds of 3d-transition elements and metals of rare-earth (R) have been carried out by many workers. The authors have investigated previously the effect of composition and heat-treatment on magnetic properties of cast (Ce-MM)-Co-Cu alloys and proposed the new process of "High-temperature heat treatment", by which the remarkably improved higher magnetic properties were obtained.
This experiment was carried to produce (Ce-MM)-Co-Cu alloys by means of powder metallurgy. The effects of particle size distribution, pressing pressure, sintering temperature, and sintering time on magnetic and physical properties of the sintered compacts were examined. Some properties of a typical sample are as follows : 4πI15K = 4200 G, 4πIr, = 4180 G, IHC = 4500 Oe, BHC = 3600 Oe, (BH)max = 4.2 MG-Oe, D = 8.0 g/cm3, and Hv = 639. The condition to reach the above properties was such that ball milling time for 5 hr, pressing pressure of 4t/cm2, sintering temperature at 1200°C, sintering time for 2 hr, and sintering atmosphere of Ar gas.
