US 6,273,966 B1 · High performance rare earth-transition metal magnetostrictive materials

Abstract

A high performance rare earth-transition metal magnetostrictive material with increased impurities having the formula (Rx1Rx2 . . . Rx11)1(My1My2 . . . My6)z is provided. Each R is selected from the group of elements consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium and yttrium, where 0≦x1≦1, 0≦x2≦1 . . . 0≦x11≦1 and where x1+x2+ . . . +x11=1. Each M is selected from the group of elements consisting of iron, manganese, cobalt, nickel, aluminum and silicon, where 0≦y1≦1, 0≦y2≦1 . . . 0≦y6≦1, where y1+y2+ . . . +y6=1 and where 1.8≦z≦2.1. The material has oxygen impurities, nitrogen impurities and carbon impurities. The oxygen impurities having an atomic percent ranging from 6,011 to 34,000 parts per million. The nitrogen impurities having an atomic percent ranging from 575 to 4,400 parts per million. The carbon impurities having an atomic percent ranging from 939 to 21,000 parts per million. The material exhibits acceptable magnetostrictive strain performance at a reduced cost.

Claims18

Dependent claims

A rare earth-transition metal magnetostrictive material having the formula (Rx1Rx2 . . . Rx11)1(My1My2 . . . My6)z wherein

each R is selected from the group of elements consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium and yttrium, where 0≦x1≦1, 0≦x2≦1 . . . 0≦x11≦1 and where x1+x2+ . . . +x11=1, and
each M is selected from the group of elements consisting of iron, manganese, cobalt, nickel, aluminum and silicon, where 0≦y1≦1, 0≦y2≦1 . . . 0≦y6≦1, where y1+y2+. . . +y6=1 and where 1.8≦z≦2.1,
the material having a magnetostrictive strain that produces an aligned crystalline or polycrystalline structure to exploit the anisotropy of magnetostriction of the material to yield an optimized macroscopic change in length in response to an applied magnetic field, the material having an atomic percent of oxygen ranging from 6,011 to 34,000 parts per million, an atomic percent of nitrogen ranging from 575 to 4,400 parts per million and an atomic percent of carbon ranging from 939 to 21,000 parts per million.

A rare earth-transition metal magnetostrictive material having the formula (TbxD1−x)1Fe1.8−2.1 wherein 0≦x≦1, the material having a magnetostrictive strain that produces an aligned crystalline or polycrystalline structure to exploit the anisotropy of magnetostriction of the material to yield an optimized macroscopic change in length in response to an applied magnetic field and having an atomic percent of oxygen ranging from 6,011 to 34,000 parts per million, an atomic percent of nitrogen ranging from 575 to 4,400 parts per million and an atomic percent of carbon ranging from 939 to 21,000 parts per million.

Dependencies are inferred from the claim text.

High performance rare earth-transition metal magnetostrictive materials

Life of this patent

High performance rare earth-transition metal magnetostrictive materials

Life of this patent

Abstract

Claims18