| 简介 |
PROBLEM TO BE SOLVED : To provide a bond magnet which is composed of Co loess R1 based d-HDDR anisotropic magnet powder and excellent in magnetic property and thermal resistance.
SOLUTION : This bond magnet is composed of Co loess R1 based d-HDDR coarse powder wherein mean particle diameter and compounding ratio are specified and surface coating is performed with surfactant, R2 based impalpable powder wherein surface coating is performed with surfactant, and resin which is binder (R1 and R2 are rare earth elements). Periphery of the Co loess R1 based d-HDDR coarse powder is surrounded with a ferromagnetic cushion object wherein R2 based impalpable powder is distributed equality in resin. The bond magnet shows superior thermal resistance together with high magnetic property in spite of the Co loess R1 based d-HDDR anisotropic magnet powder whose oxidation resistance is inferior and crack sensitivity is high is used. |
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