Full sintered NdFeB and SmCo processing chain — from strip casting and hydrogen decrepitation through vacuum sintering, CNC machining, multi-layer coating, and salt-spray validated corrosion protection.
Best fit when the buyer needs grade selection tied to temperature, corrosion, radiation, demagnetization margin, and documentation rather than only maximum Br.
| Program Metric | Typical Range | Procurement Value |
|---|---|---|
| Max Operating Temp | Up to 350°C (SmCo) / 80–230°C (NdFeB by grade) | Prevents irreversible field loss during operation and fault conditions. |
| Intrinsic Coercivity (Hcj) | Grade-dependent: N (≥12 kOe), H (≥17), SH (≥20), UH (≥25), EH (≥30), AH (≥35 kOe); SmCo typically 15–30 kOe | Hcj is the main guardrail against demagnetization in high-temperature or high-field Halbach systems. |
| Coating Corrosion Resistance | Ni-Cu-Ni (5–20 µm): 72h salt spray (SST), 48h pressure cooker (PCT); epoxy, Parylene, or phosphating by environment | Sintered NdFeB corrodes rapidly without proper multi-layer coating. SST and PCT provide standardized evidence of protection quality. |
| Powder Particle Size | 3–7 µm after jet milling (sintered NdFeB) | Particle size directly affects magnetic alignment quality during orientation pressing, which determines final Br and BHmax. |
When temperatures exceed 200°C or the assembly is exposed to high radiation levels (e.g., accelerators).
No. N52 has high room-temperature remanence, but high-temperature Halbach arrays often need SH, UH, EH, AH, or SmCo grades for coercivity margin.
NiCuNi, epoxy, Parylene, or custom coating stacks can be reviewed once humidity, chemical exposure, temperature, and bonding method are known.
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