Metal treatment – Stock – Magnetic
Patent
1992-04-21
1994-02-15
Sheehan, John P.
Metal treatment
Stock
Magnetic
148301, 420 83, 420121, H01F 1053
Patent
active
052863077
ABSTRACT:
A process for preparing a permanent magnet is disclosed. The process comprises the steps of exposing material, in particulate form, and having an overall composition comprising 8 to 30 atomic percent of a first constituent selected from the group consisting of rare earth metals, 42 to 90 atomic percent of a second constituent selected from the group consisting of transition metals and 2 to 28 atomic percent of a third constituent selected from the group consisting of substances from Group III of the Periodic Table, to hydrogen gas under conditions such that hydrogen gas is absorbed by the material, exposing the hydrided material, in particulate form, to oxygen or an oxygen-containing gas in an amount and for a period of time sufficient to passivate the material, and compacting the material. Also disclosed are products from this process, namely, passivated, hydrided particles, alloy compacts formed of passivated, hydrided material and permanent magnets, having superior properties.
REFERENCES:
patent: 4588439 (1986-05-01), Narasimhan et al.
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4663006 (1987-05-01), Furchart et al.
patent: 4684406 (1987-08-01), Matsuura et al.
patent: 4760966 (1988-08-01), Finnegan et al.
patent: 4770723 (1988-09-01), Sagawa et al.
patent: 4857118 (1989-08-01), Van Mens et al.
patent: 4911882 (1990-03-01), Greenwald et al.
J. Omerod, J. of the Less-Common Metals, 111 49-69 (1985).
C. Herget, Mettalurgical Ways to NdFeB Alloys. Permanent Magnets from Co-reduced NdFeB, 8th International Workshop on Rare-Earth Magnets and Their Applications, Dayton, Ohio, May 6-8, 1985.
J. Omerod, Processing and Physical Metallurgy of NdFeB and Other Rare Earth Magnets, Nd-Fe Permanent Magnets-Their Present and Future Applications, Report and Proceedings of Workshop Meeting Held in Brussels on Oct. 25, 1984.
J. Omerod, The Physical Metallurgy and Processing of Sintered Rare Earth Permanent Magnets, International Rare Earth Conference, ETH Zurich, Switzerland, Mar. 4-8, 1985.
I. R. Harris et al., J. of the Less-Common Metals, 106 L1-4 (1985).
P. J. McGuiness et al., J. of Materials Science 21 4107-4110 (1986).
K. S. V. L. Narasinhan, J. Appl. Phys. 57 4081-4085 (1985).
R. E. Johnson, Rare-Earth Cobalt Permanent Magnets Containing Praseodymium, Cobalt, 1 21-24 (1974).
H. Oesterreicher, Proceedings of the Second International Symposium on Magnetic Anisotropy and Coercivity in Rare Earth-Translation Metal-Alloys, San Diego, California, Jul. 1, 1978, pp. 54-64.
McGuiness et al., The Production of a Nd-Fe-B Permanent Magnet by a Hydrogen Depreciation/Attritator Milling Route, J. Mat. Sci., 1986, 21, 4107-4110.
E. P. Wohlfarth et al., Ferromagnetic Materials, vol. 4, 1988, p. 78, North Holland Publishing Co., Amsterdam, NL, para. 1-2.
Patent Abstracts of Japan, vol. 13, No. 139 (E-738) [3487], 6th Apr. 1989; JP-A-63 301 505 (Hitachi Metals Ltd.), Dec. 8, 1988.
Search Report for EP 90 11 7124 (EP 90 11 7124 corresponds to above-captioned application).
Sheehan John P.
SPS Technologies, Inc.
LandOfFree
Process for making Nd-B-Fe type magnets utilizing a hydrogen and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for making Nd-B-Fe type magnets utilizing a hydrogen and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making Nd-B-Fe type magnets utilizing a hydrogen and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1203837