Method for the manufacture of rare earth transition metal alloy

Details Method for the manufacture of rare earth transition metal alloy Method for the manufacture of rare earth transition metal alloy

1988-02-24

1989-08-01

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 75 05R, 75 05BA, 419 12, 419 33, H01F 102

Patent

active

048530450

ABSTRACT:
In a known method of manufacturing a sintered rare earth transition metal and boron magnet body, e.g. of Nd--Fe--B, the cast alloy is comminuted by hydrogen decrepitation in an atmosphere of pure hydrogen before further comminution, pressing in a magnetic alignment field, sintering and magnetization. The use of pure hydrogen introduces a serious risk of explosion. In the improved method the hydrogen is provided mixed with a chemically non-reactive gas, suitably nitrogen, suitably in a proportion in the range 5 percent to 30 percent by volume of hydrogen, to form an explosion suppressant atmosphere in the decrepitation vessel 1. Sole FIGURE.

REFERENCES:
patent: 4663066 (1987-05-01), Fruchart et al.
McGuiness et al., "The Production of a Nd-Fe-B Permanent Magnet by Hydrogen Decrepitation/Attritor Milling Route", J. of Materials Science, 21 (1986), 4107-4110.
Harris et al., "The Hydrogen Decrepitation of an Nd.sub.15 Fe.sub.77 B.sub.8 Magnetic Alloy" J. of the Less-Common Metals, 106 (1985), L1 to L4.

Affiliated with

Also associated with

Rating

Method for the manufacture of rare earth transition metal alloy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for the manufacture of rare earth transition metal alloy , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the manufacture of rare earth transition metal alloy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-128980