Anisotropic rare-earth magnet light wave microwave sintering method
A rare-earth magnet, anisotropic technology, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of uneven internal grain growth, uneven grain growth, and affecting the magnetic properties of finished products. Reach the effects of reducing post-machining allowance, less internal pores, and short sintering time
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[0015] The prepared anisotropic NdFeB (neodymium iron boron) magnet body, which has been magnetically oriented and pressed, is placed in a light wave microwave oven and sintered in an inert gas atmosphere. The microwave frequency is 2450MHz, the microwave power is controlled to 70% of the total heating power, and the light wave power is controlled to 30% of the total heating power. The heating rate is 200℃ / min, the sintering temperature is 1050℃, the holding time is 40min, and the cooling rate is 20℃ / min. The tempering heat treatment is two-stage tempering, the high temperature tempering temperature is 900℃, the holding time is 90min; the low temperature tempering temperature is 660℃, the holding time is 60min, and the fast cooling. The inert gas circulates during sintering.
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