Manufacturing Process of NdFeB Magnets (English, 100 Words)

1. Raw Material Preparation
   Mix neodymium, iron, boron, and additives (e.g., Dy, Pr) in precise ratios, followed by vacuum melting and strip casting to form alloy flakes12.

2. Hydrogen Decrepitation & Milling
   Use hydrogen to fracture alloy flakes (HD process), then pulverize them into fine powder via jet milling19.

3. Pressing & Alignment
   Compact powder in a magnetic field to align particles, followed by isostatic pressing to enhance density12.

4. Sintering & Heat Treatment
   Vacuum-sinter pressed blocks at 1,080–1,120°C to form dense structures, then temper for optimal coercivity19.

5. Machining & Coating
   Grind sintered blocks into final shapes (e.g., discs, rings) and apply coatings (nickel, zinc, epoxy) to prevent corrosion29.

Key steps: Alloy design → Orientation → Sintering → Finishing. Surface treatments ensure durability in harsh environments19.