Preparation of magnet

Details Preparation of magnet Preparation of magnet

1997-12-04

1999-06-29

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148122, 164423, 164463, H01F 1053

Patent

active

059163763

ABSTRACT:
An object of the invention is to provide an inexpensive magnet having a high coercivity, high squareness ratio and high maximum energy product. According to the invention, a magnet containing R, T, N, and M wherein R is at least one rare earth element with essential samarium, T is iron or iron and cobalt, and M is at least one element of Ti, V, Cr, Nb, Hf, Ta, Mo, W, Al, C, and P, with essential zirconium, in amounts of 4-8 at % of R, 10-20 at % of N, 2-10 at % of M, and having a hard magnetic phase (TbCu.sub.7 type crystalline phase) and a soft magnetic phase (which is a bcc structured T phase, has an average grain diameter of 5-60 nm, and accounts for 10 to 60% by volume of the entirety), the atomic ratio (R+M)/(R+T+M) in the hard magnetic phase being in excess of 12.5%, is prepared utilizing a single roll technique. In the single roll technique, the peripheral speed of a chill roll is at least 50 m/s, and the discharge pressure of the molten alloy is 0.3-2 kgf/cm.sup.2. Following quenching, the quenched alloy is subjected to heat treatment at 600-800.degree. C. and then to nitriding treatment.

REFERENCES:
patent: 5209789 (1993-05-01), Yoneyama et al.
patent: 5309977 (1994-05-01), Yoneyama et al.
patent: 5456769 (1995-10-01), Sakurada et al.
patent: 5482573 (1996-01-01), Sakurada et al.
patent: 5549766 (1996-08-01), Tsutai et al.
patent: 5641363 (1997-06-01), Fukuno et al.
patent: 5665177 (1997-09-01), Fukuno et al.
patent: 5750044 (1998-05-01), Yoneyama et al.

Affiliated with

Also associated with

Rating

Preparation of magnet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of magnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of magnet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1372648