Ferritic Fe-Ni magnetic alloys

Metal treatment – Compositions – Heat treating

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

75123K, 179117, 179120, C04B 3500

Patent

active

043989721

ABSTRACT:
Disclosed are magnetically soft ferritic multiphase Fe-Ni alloys having a Ni content in the range of about 4 to about 16 weight percent, devices containing a body fabricated from such alloys, and method for heat treating such body. Appropriate heat treatment comprises a low-temperature anneal in the two-phase (.alpha.+.gamma.) region of the Fe-Ni phase diagram, and typically results in improved magnetic properties. In particular, alloys according to the invention having x weight percent of Ni have a maximum permeability .mu..sub.m at least as large as 1.5[25(16-x).sup.2 ]G/Oe. The alloys typically also have a coercive field H.sub.c at most as large as 0.7[0.65(1+0.6x)]Oe, a saturation induction B.sub.s of at least about 20 kG, a maximum incremental permeability .DELTA..mu., measured with an applied a.c. field of about 0.005 Oe, of at least about 150 G/Oe, and a yield strength to 0.2 percent offset of at least about 40 10.sup.3 psi, with all the material properties measured at room temperature. Alloys according to the invention can advantageously be used in devices comprising a magnetically soft body, for instance in electro-acoustic transducers, e.g., in telephone receivers.

REFERENCES:
patent: 1855816 (1932-04-01), Andres
patent: 3549830 (1970-12-01), Hofman
patent: 3574003 (1971-04-01), Nara et al.
patent: 4075437 (1978-02-01), Chin et al.
patent: 4327257 (1982-04-01), Schwartz
Magnetism and Metallurgy of Soft Magnetic Materials, North-Holland Pub. Co. (1977) pp. 267-268.
Constitution of Binary Alloys, 2nd ed. McGraw-Hill Book Co. (1958) pp. 667-684, Hansen.
Ferromagnetism Materials, vol. 2, E. P. Wohlfarth ed., North-Holland Pub. Co. (1980) pp. 123-168.
Ferromagnetism, Van Nostrand (1951) pp. 102-119.
Bell System Technical Journal, vol. 30, pp. 110-140, (1951).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Ferritic Fe-Ni magnetic alloys does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ferritic Fe-Ni magnetic alloys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ferritic Fe-Ni magnetic alloys will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-812988

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.