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Abstract

A NdFeB rare earth permanent magnet with composite main phase and a manufacturing method thereof are provided. In the composite main phase, a PR₂(Fe_1-x-yCo_xAl_y)₁₄B main phase is the core, ZR₂(Fe_1-w-nCo_wAl_n)₁₄B main phase surrounds a periphery of the PR₂(Fe_1-x-yCo_xAl_y)₁₄B main phase, and no grain boundary phase exists between ZR₂(Fe_1-w-nCo_wAl_n)₁₄B main phase and the PR₂(Fe_1-x-yCo_xAl_y)₁₄B main phase, wherein ZR represents a group of rare earth elements in which a content of heavy rare earth is higher than an average content of heavy rare earth in the composite main phase, PR represents a group of rare earth elements in which a content of heavy rare earth is lower than an average content of heavy rare earth in the composite main phase. The manufacturing method includes steps of LR—Fe—B-Ma alloy melting, HR—Fe—B-Mb alloy melting, alloy hydrogen decrepitating, metal oxide micro-powder surface absorbing and powdering, magnetic field pressing, sintering and ageing.

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