A SINTERED ND-FE-B MAGNET AND MANUFACTURING METHOD THEREOF

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The present invention provides a sintered Nd-Fe-B magnet and a production method thereof. In the sintered Nd-Fe-B magnet a total amount of Pr and Nd is 31wt.% ≤ Pr and Nd ≤ 35wt.%; B is present in an amount of 0.95wt.% ≤ B ≤ 1.2wt %; Al is present in an amount of O.21wt.% ≤ Al ≤ 1wt.%; Co is present in an amount of 0.2wt.% ≤ Co ≤ 4wt.%; Cu is present in an amount of 0.1wt.% ≤ Cu ≤ 0.2wt.%; Ga is present in an amount of 0.5wt.% ≤ Ga ≤ 1wt.%; Ti is present in an amount of 0.3wt.% ≤ Ti ≤ 1wt.%; and a total amount of heavy rare earth elements is less than or equal to 0.2wt.%.The balance element is Fe. The impurities of C, O, and N in the magnet satisfy formula 630ppm ≤ 1.2xC content + 0.6×O content + 1 xN content ≤ 3680ppm.