A higher grade number is not automatically a better design. The correct magnet balances flux target, operating point, temperature, irreversible loss, coating and assembly conditions.
Define continuous and peak temperature at the magnet, not only ambient temperature. Include reverse fields, air gap, nearby steel, mechanical shock and any thermal cycle that can move the operating point toward the knee of the demagnetization curve.
Final grade selection requires a magnetic-circuit review, but the material family narrows the route.
| Material | Strength | Temperature / environment position |
|---|---|---|
| NdFeB | Highest energy density | Grade-dependent temperature; coating usually required |
| SmCo | High energy density | Strong high-temperature and corrosion performance |
| Ferrite | Moderate | Stable, economical and naturally corrosion resistant |
| AlNiCo | Moderate remanence | Excellent temperature stability but lower coercivity |
Ningbo Empire can review the B-H curve, load line, tolerance stack and magnetization fixture requirements. Prototype validation should measure the assembly output at temperature rather than relying only on room-temperature magnet data.
No. N52 offers higher room-temperature energy density, while another grade may provide better coercivity, temperature margin, availability or cost for the application.
SmCo is often considered for high temperature, corrosive environments or applications needing strong magnetic stability, subject to geometry and cost review.
Review the relevant product and manufacturing capability.
View capability →Compare the adjacent material or application route.
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Read guide →Engineering guide to gas porosity, shrinkage, vacuum assistance, impregnation, X-ray inspection and leak testing for pressure-tight aluminum die castings.
Read guide →Send the drawing, application conditions and annual volume. Engineering will review the material, process and inspection route.
