Manufacture of rare-earth magnet

Abstract

Abstract PURPOSE:To markedly improve the characteristics of a magnet by a method wherein the alloy thin belt, manufactured by quenching a fused alloy, is heat- treated and then it is used as an alloy material. CONSTITUTION:A quenched thin belt of about 50 mum in thickness is obtained by fusing an alloy material in an argon atmosphere using a high frequency heating method in such a manner that the alloy will be composed of 32.0 wt. % Nd, 1.0 wt. % B and the remainder consisting of Fe, the fused alloy is jetted out to rotating iron rolls and it is cooled quickly. Then, after said alloy thin belt has been heat-treated in an Ar atmosphere, it is cooled quickly. After this alloy material has been coarse-pulverized, it is reduced to fine powder. The fine powder is compressed at the pressure of 1 ton/cm<2> using a ball mill, and sintered in an Ar atmosphere after it is held in a vacuum atmosphere. Subsequently, it is cooled slowly, quenched, and aged. As a result, the magnetic characteristics of Br, 1Hc and (BH)max can be increased substantially, and the sinterability of said material can also be improved.

Inventors

• 👤 Tadakuni Sato
• 👤 忠邦 佐藤

Bibliographic Details