Permanent magnets made from iron alloys
US5403407A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Apr 8, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/058
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A new alloy for permanent magnets which is of the composition (R.sub.x Fe.sub.y-w Co.sub.w M.sub.z)L.sub..alpha. transition metals M such as, but not limited to Cr, Mo, Ti and V and mixtures thereof. R would be rare earth metals such as, but not limited to Nd, Pr, Dy and Tb, other rare earths, Y, and La and mixtures thereof. L is carbon or nitrogen or a mixture thereof. x+y+z equals 100 atomic %, x is from about 5 to about 20%, y is from about 65 to about 85%, z is from about 6 to about 20%, w.ltoreq.20%, and .alpha. is from about 4 to about 15%. We have also developed a new process whereby the alloy metal magnets are formed by taking the ingredients and arc melting the individual elements R, Fe, Co and M at least once whereby forming an alloy ingot, and if necessary, remelting the alloy ingot as many times as necessary and reforming the alloy to form a more uniform alloy. The alloy formed is then ground into a powder. The powders are then formed into magnets and are bonded at high temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.