NDLI: Long-term stability of Sm/sub 2/Co/sub 17/-type magnets for control rod drive mechanism (CRDM) in a nuclear reactor

Content Provider	IEEE Xplore Digital Library
Author	Iida, H. Imayoshi, S. Morimoto, K. Watanabe, M. Komada, N. Takeshita, T.
Copyright Year	1965
Abstract	For an application of Sm/sub 2/Co/sub 17/-type magnets for a driving motor of control rod drive mechanism (CRDM) placed inside a nuclear reactor vessel, long-term stabilities of Sm(Co/sub 0.61/Fe/sub 0.28/Cu/sub 0.08/Ni/sub 0.01/Zr/sub 0.02/)/sub 7.3/ magnets were evaluated under the severe conditions. Initial magnetic properties of the specimens at room temperature were: B/sub r/=1.03 T, H/sub cJ/=1400 kA/m and (BH)/sub max/=207 kJ/m/sup 3/. Irreversible losses of open-circuit remanent flux of the specimens exposed for 19000 hours in 1 atm Ar atmosphere were 5/spl sim/10% at the temperature (573/spl sim/603 K) and the operating point (permeance coefficient of 1.7/spl sim/2.4) of the actual driving motor application. Large fraction of the irreversible loss is attributed to permanent flux loss due to oxidation of the specimen. Losses due to thermal fluctuation aftereffect of these specimens are estimated to be less than 5%. Multi-layer coating of Ni, Cu, Ni and Au was found to be effective to protect the magnets from the oxidation. The coated specimens exhibited a small permanent loss value of 0.5% after the exposure to 120 atm water for 2000 hours at 613 K.
Sponsorship	IEEE Magnetics Society
Starting Page	3653
Ending Page	3655
Page Count	3
File Size	369862
File Format	PDF
ISSN	00189464
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stability Magnets Temperature Oxidation Iron Zirconium Magnetic properties Argon Atmosphere Fluctuations
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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