Hitachi Metals, Ltd.

Rokuo Ichiyasu

Tsutomu Inui

Yoshitaka Chiba

Shunichiro Matsumoto

Takeo Mizuguchi

Shun-ichiro Matsumoto

A rare earth metal-iron group metal target for a magneto-optical disk is produced by mixing power (a) produced by the rapid quenching treatment of an alloy composed of at least one rare earth metal and at least one iron group metal in a composition range which permits the formation of an eutectic structure, with powder (b) from at least one iron group metal in an amount necessary for meeting the composition requirements of the target; and subjecting the resulting mixture to pressure sintering in vacuum or in an inert gas atmosphere at a temperature lower than a liquid phase-appearing temperature of the mixture to produce a rare earth metal-iron group metal intermetallic bonding layer betwen the particles.

Rare earth metal-iron group metal target, alloy powder therefor and

A rare earth metal-iron group metal target for a magneto-optical disk is produced by mixing powder (a) produced by the rapid quenching treatment of an alloy composed of at least one rare earth metal and at least one iron group metal in a composition range which permits the formation of an eutectic structure, with powder (b) from at least one iron group metal in an amount necessary for meeting the composition requirements of the target; and subjecting the resulting mixture to pressure sintering in vacuum or in an inert gas atmosphere at a temperature lower than a liquid phase-appearing temperature of the mixture to produce a rare earth metal-iron group metal intermetallic bonding layer between the particles.

A sintered target member consisting essentially of 50-75 weight % of Co, 3-12 weight % of Cr and balance substantially Ni, which has a structure comprising dispersion phases consisting essentially of one or more elements constituting the target member and having a maximum permeability of 50 or less. This target member is produced by mixing metal or alloy powders corresponding to low-permeability dispersion phases, charging the resulting mixture into a metal container; sealing the metal container under reduced pressure; sintering it at a temperature of 900.degree.-1300.degree. C. and pressure of 500 atm or more; and removing the metal container from the resulting sintered body.

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Yonago, Japan

Rokuo Ichiyasu