Rare earth alloy sintered compact and method of making the same

Details Rare earth alloy sintered compact and method of making the same Rare earth alloy sintered compact and method of making the same

2007-04-10

2007-04-10

Sheehan, John P. (Department: 1742)

Metal treatment

Stock

Magnetic

C419S012000, C075S244000

Reexamination Certificate

active

10381008

ABSTRACT:
A rare earth alloy sintered compact includes a main phase represented by (LR1-xHRx)2T14A, where T is Fe with or without non-Fe transition metal element(s); A is boron with or without carbon; LR is a light rare earth element; HR is a heavy rare earth element; and 0<x<1. The sintered compact is produced by preparing multiple types of rare earth alloy materials including respective main phases having different HR mole fractions, mixing the alloy materials so that the sintered compact will include sintering a main phase having an average composition represented by (LR1-xHRx)2T14A, thereby obtaining a mixed powder, and the mixed powder. The alloy materials include first and second rare earth alloy materials represented by (LR1-uHRu)2T14A (where 0≦μ&<x) and (LR1-vHRV)2T14A (where x<v≦1) and including a rare earth element R(=LR+HR) at R1 and R2 (at%), respectively. Δ=|R1−R2| is about 20% or less of (R1+R2)/2.

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