Permanent magnet alloy powder

Abstract

Abstract PURPOSE:To improve the characteristics of a magnet by a method wherein the composition range of main components R, B and Fe is limited and the alloy has a specific fine complex structure and is composed of an R-rich phase and an R- poor phase and its main phase is practically tetragonal compound. CONSTITUTION:The content of R (at least of rare earth elements including Y) is within the range of 8-30atom% and the content of B is within the range of 2- 28atom%. 42-90atom% of Fe is contained. These components are subjected to high frequency melting in vacuum and argon atmosphere. The molten components are dripped and atomized by, for instance, high speed argon gas whose speed is ultrasonic, and practically spherical powder is formed. The alloy powder has a fine complex structure and cimposed of an R-rich phase and an R-poor phase. Its main phase is practically tetragonal compound. With this constitution, a high performance anisotropic or isotropic magnet can be obtained.

Inventors

• 👤 Michio Yamashita
• 👤 三千雄 山下
• 👤 Masato Sagawa
• 👤 佐川　真人

Bibliographic Details