Heavy-Rare-Earth-Free NdFeB Magnet
无重稀土烧结钕铁硼磁体
Sintered NdFeB without dysprosium or terbium — HRE-free alloy design and sintering for N/M/H/SH grades. Significantly less reliance on controlled heavy rare earths, with a more stable supply chain and cost.
Global export restrictions on heavy rare earth elements (Dy/Tb) have created uncertainty in magnet supply chains. AIC Engineering's heavy-rare-earth-free sintered NdFeB (green process route) contains no dysprosium or terbium in alloy composition and manufacturing — covering N, M, H, and SH series for applications that need supply resilience and cost stability.
For higher-coercivity SH/UH/EH requirements, grain-boundary diffusion (GBD, yellow route) or conventional heavy-rare-earth processing (blue route) are also available — see the performance chart below. GBD achieves the same coercivity with 40–70% less heavy rare earth versus conventional grades.
Key Advantages
Export Resilience
No Dy/Tb in the HRE-free route — significantly reduces exposure to heavy-rare-earth export controls and supply disruption.
Cost Stability
Decoupled from dysprosium/terbium price swings. More predictable long-term procurement costs.
Strong N–SH Performance
HRE-free alloy and microstructure control deliver high (BH)max and coercivity across N, M, H, and SH grades.
N–SH Grade Coverage
N50–N60, 48M–58M, 42H–54H, 30SH–52SH — mainstream motor, consumer, and industrial applications.
Three Process Routes — Performance Comparison
The chart maps intrinsic coercivity (Hcj) vs. maximum energy product BH(max) for each process route. This product is the green HRE-free route (N–SH); yellow and blue routes are available for higher-temperature grades.
Schematic illustration only — not an exact reproduction of measured coordinates or the original technical chart.
Grade Coverage
All grades are available in standard shapes (block, cylinder, ring, arc/tile, special-shaped).
Heavy-Rare-Earth-Free Process — No Dy/Tb (This Product)
N / M / H / SH series — no dysprosium or terbium in alloy composition or manufacturing
The HRE-free route uses alloy design and sintering without adding dysprosium or terbium, covering N, M, H, and SH grades for applications that need supply resilience and stable cost.
Compared with conventional bulk alloying, this route significantly reduces exposure to export controls on controlled heavy rare earths while delivering strong magnetic performance across mainstream grade bands.
Typical Applications
No dysprosium or terbium in alloy composition and manufacturing
HRE-Free Grade Coverage
| Series | Grades Covered | Min. Hcj |
|---|---|---|
| N | N50 / N52 / N54 / N56 / N58 / N60 | ≥ 12 kOe |
| M | 48M / 50M / 52M / 54M / 56M / 58M | ≥ 14 kOe |
| H | 42H / 45H / 48H / 50H / 52H / 54H | ≥ 17 kOe |
| SH | 30SH / 33SH / 35SH / 38SH / 40SH / 42SH / 45SH / 48SH / 50SH / 52SH | ≥ 20 kOe |
Grain-Boundary Diffusion (GBD) — High Coercivity, Low HRE
For SH / UH / EH grades requiring higher operating temperatures
Grain-boundary diffusion (GBD) introduces dysprosium or terbium at the magnet surface or near-surface; subsequent diffusion heat treatment distributes it along grain boundaries, sharply boosting coercivity and high-temperature stability without heavy overall alloy addition.
Compared with conventional bulk alloying, GBD achieves the same grade coercivity with 40–70% less total Dy/Tb — maintaining high performance while lowering material cost and exposure to export-control risk.
Typical Applications
Less heavy rare earth at equivalent coercivity (vs. conventional process)
GBD Grade Coverage
| Series | Grades Covered | Min. Hcj |
|---|---|---|
| SH | 35SH–56SH (full) | ≥ 20 kOe |
| UH | 35UH–54UH (full) | ≥ 25 kOe |
| EH | 33EH–52EH (full) | ≥ 30 kOe |
| Series | Grades Covered | Min. Hcj |
|---|---|---|
| SH | 42SH–56SH | ≥ 20 kOe |
| UH | 38UH–48UH | ≥ 25 kOe |
| EH | 33EH–40EH | ≥ 30 kOe |
Typical Applications
Need HRE-Free NdFeB for Your Project?
Our engineering team can advise on grade selection, size feasibility, coating, and MOQ. Prototype quantities from 10 g — sample fee credited on bulk order.
Contact Engineering Team