MISCH-METAL PERMANENT MAGNETIC MATERIAL AND METHOD FOR PREPARING THE SAME BASED ON SINTERING AND MULTI-STEP DIFFUSION
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United States of America
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Dec 26, 2024
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Sep 5, 2024
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Sep 5, 2024
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Abstract
A preparation method of a misch-metal permanent magnetic material based on sintering and multi-step diffusion is provided. A sintered substrate magnet is prepared by induction melting, strip casting, hydrogen decrepitation, jet milling, magnetic alignment, isostatic pressing and sintering. A first diffusion source and a second diffusion source are prepared, where the first diffusion source is a light rare-earth metal or its alloy, and the second diffusion source is a light-heavy rare-earth combination or its alloy. The sintered substrate magnet is sequentially subjected to a first vacuum diffusion with the first diffusion source and a second vacuum diffusion with the second diffusion source. The resultant product is subjected to low-temperature tempering to give the desired misch-metal permanent magnetic material.
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