Permanent Magnet Properties and Microstructures of Chill-Cast (Ce–MM)–Cu–Co Ternary Alloys

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  • Permanent Magnet Properties and Microstructures of Chill-Cast (Ce–MM)–Cu–Co Ternary Alloys

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Several reports have hitherto been submitted in relation to the studies on R(Cu, Co)5 cast magnets in which Co is substituted by Cu in RCo5 series permanent magnet alloys. The purpose of the present study is to put the anisotropy on the ternary alloy and to produce it with less expensiveness by a practical utilization of the chill-cast process, and to examine the relations between the magnetic properties and the microstructures. That is, the specimen is subjected to a heat-treatment at specific temperatures in Ar atmosphere for 1 hr either in the as-cast state or at 300∼1200°C; thereafter, the changes in the magnetic properties and in the microstructures, etc. are examined on both furnace-cooled specimens and air-quenched specimens. The results are given as follows:<BR>(1) In the cast state, the ternary composition (Ce–MM)CuCo4 exhibited the most conspicuous chill effect, and the values for magnetic properties were 4πIr⁄4πI10K=0.96 and (B·H)max=5.5MG·Oe.<BR>(2) In the heat-treated specimens, a comparison between the furnace-cooled and air-quenched specimen revealed that the magnetic properties of the latter were to those of the former. That is, by heat treatment at 500°C for 1 hr the (Ce–MM)CuCo4 alloy exhibited 4πI10K=5450 G, 4πIr=5200 G, IHC=3700 Oe and (B·H)max=6.0 MG·Oe.<BR>(3) The specimens heat-treated at temperatures higher than 800°C exhibited snake-like I-H curves. By means of X-ray diffraction, the Ce2Co17 phase was newly detected in addition to the CeCo5 phase, which may be considered as a cause for forming the I-H curves.

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