Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1989-10-26
1991-02-12
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
420 83, 420435, 420455, B22F 900
Patent
active
049920952
ABSTRACT:
An alloy target used for manufacturing a magneto-optical recording medium, wherein the component and composition comprises 10-50 atom % of at least one of rare earth elements selected from the group consisting of Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm, from 0.1 to 10 atom % of at least one of additive elements selected from the group consisting of B, Al, Si, P, Ti, V, Cr, Mn, Zr, Nb, Mo, Hf, Ta, W, Pt, Pb and Bi and the balance substantially composed of at least one of transition metals selected from the group consisting of Co, Fe and Ni; and a structure comprises any one of mixed structure from a group consisting of (1) a mixed structure comprising a phase of intermetallic compound of rare earth element--additive element--transition metal, and a fine mixed phase of rare earth element and intermetallic compound of rare earth element--transition metal, (2) a mixed structure comprising a phase of intermetallic compound of rare earth element--transition metal and a fine mixed phase of rare earth element and intermetallic compound of rare earth element--transition metal (at least one of the rare earth element and the intermetallic compound in the fine mixed phase contains additive element); (3) a mixed phase comprising a phase of intermetallic compound of rare earth element--transition metal and a phase of intermetallic compound of rare earth element--additive element; (4) a mixed structure comprising any one of the mixed structures (1), (2) and (3) above and a phase of rare earth element alone; and (5) a mixed structure of any one of the mixed structures comprising a phase of intermetallic compound of rare earth element--additive element--transition metal, and a phase of rare earth element alone; in which the phase of the transition metal alone is not substantially present.
REFERENCES:
patent: 4582535 (1986-04-01), Buschow
patent: 4620872 (1986-11-01), Hijikata et al.
patent: 4915737 (1990-04-01), Morimoto et al.
patent: 4915738 (1990-04-01), Morimoto et al.
Endo Shinobu
Morimoto Toshio
Nate Tasuo
Hunt Brooks H.
Mai Ngoclan T.
Sumitomo Metal Mining Company Ltd.
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