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In order to produce N44SH and N40UH high-grade magnet, both strip casting and hydrogen decrepitation processes were adopted, and the subsequent milling, sintering and heat-treatment processes were improved. The density of N40UH magnet is risen up to 7.65 g/cm c . Weight loss rate after the Highly Accelerated Stress Test (HAST) for 48 hours is less than 0.2 mg/cm b . The microstructure...
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