ODM Sintered Strong Neodymium Bar Magnets With N35 Grade Low Brittleness
Price:
As negotiation
MOQ:
100pcs
Delivery Time:
20-25days
Brand:
UNMAG
Product Description
ODM Sintered Strong Neodymium Bar Magnets With N35 Grade Low Brittleness
Product Attributes
| Attribute | Value |
|---|---|
| Applications | Wide Range |
| Brittleness | Low |
| Coating | Nickel |
| Corrosion Resistance | Good |
| Magnetic Strength | High |
| Material | Neodymium |
| Max Operating Temperature | 80°C |
| Pull Force | High |
| Quality | High |
| Resistance to Demagnetization | High |
| Shape | Sintered |
Product Description
Introduction
Neodymium Iron Boron (NdFeB) or Neodymium magnets are extremely strong for their size. Available in various shapes including rings, blocks, discs and custom configurations. To prevent oxidation, these magnets are typically finished with zinc, nickel or epoxy coatings.
Manufacturing process involves melting the elements together and milling into powder that is dry-pressed to shape in a magnetic field. The material is then sintered, ground to precise dimensions, magnetized and thoroughly tested. Classified as "rare earth" magnets due to neodymium's placement in the lanthanides section of the Periodic Table.
Physical Properties of Sintered Neodymium Magnet
| Parameter Name | Parameter Values | Unit |
|---|---|---|
| Curie Temperature | 310～380 | ℃ |
| Relative Recoil Permeability | 1.02～1.05 | |
| Reversible Temperature Coefficient of Br (20~100℃) | -0.09～-0.13 | %/℃ |
| Reversible Temperature Coefficient of Hcj (20~100℃) | -0.4～-0.7 | %/℃ |
| Density | 7.50～7.70 | g/cm3 |
| Vickers Hardness | 550～700 | |
| Bending Strength | -0.09～-0.13 | MPa |
| Tensile Strength | ≥80 | MPa |
| Compressive Strength | 800 ~1050 | MPa |
| Electric Resistivity | 150 | μΩ*cm |
| Thermal Conductivity | 8～10 | W/(M*℃) |
| Coefficient of Thermal Expansion (Parallel to the orientation) | 5 | 10-6/K |
| Coefficient of Thermal Expansion (vertical to the orientation) | -1.5 | 10-6/K |
| Young's Modulus | 150～200 | GPa |
| Specific Heat(20℃～320℃) | 3.0～4.6 | J/(g*k) |
| weight loss(low weight loss products) | ≤2 | mg/cm2 |
Magnetic Properties of Sintered Neodymium Magnet
| Grade | Remanence (Br) | Coercivity (HcB) | Intrinsic Coercivity (HcJ) | Max Energy Product (BH)max | Working Temp (Tw) |
|---|---|---|---|---|---|
| N Series | |||||
| N35 | 11.7-12.2 | ≥10.9 | ≥12 | 33-36 | ≤80 |
| N38 | 12.2-12.5 | ≥11.3 | ≥12 | 36-39 | ≤80 |
| N40 | 12.5-12.8 | ≥11.4 | ≥12 | 38-41 | ≤80 |
| N42 | 12.8-13.2 | ≥11.5 | ≥12 | 40-43 | ≤80 |
| N45 | 13.2-13.8 | ≥11.6 | ≥12 | 43-46 | ≤80 |
| N48 | 13.8-14.2 | ≥11.6 | ≥12 | 46-49 | ≤80 |
| N50 | 14.0-14.5 | ≥10.0 | ≥11 | 48-51 | ≤60 |
| N52 | 14.3-14.8 | ≥10.0 | ≥11 | 50-53 | ≤60 |
Maximum Working Temperature by Grade
| Grade | Working Temp (℃) |
|---|---|
| N Series (N35~N52) | ≤80 |
| M Series (38M~50M) | ≤100 |
| H Series (35H~48H) | ≤120 |
| SH Series (33SH~48SH) | ≤150 |
| UH Series (30UH~40UH) | ≤180 |
| EH Series (30EH~38EH) | ≤200 |
Manufacturing Process
- Mixing the ingredients
- Dissolving the mixture at high temperature to prepare an alloy
- Turning the alloy into fine powder
- Molding in a magnetic field to align magnetization directions
- Sintering at ~1,100℃ followed by heat treatment at ~600℃
- Precision machining to final product shape
- Surface treatment for rustproofing
- Magnetization by applying a strong magnetic field
Applications
Ideal for applications requiring high magnetic force in compact spaces. Common uses include:
- Medical equipment
- Magnetic separators
- Linear actuators
- Microphone assemblies
- Servo motors and DC motors (including automotive starters)
- Computer hard disk drives
- Printers and speakers
Tolerance Control
| Name | Dimension(mm) | Tolerance(mm) |
|---|---|---|
| Wall thickness | T≤10 | ±0.04 |
| 10<T≤30 | ±0.05 | |
| 30<T≤50 | ±0.06 | |
| Length | L≤10 | ±0.04 |
| 10<L≤30 | ±0.05 | |
| 30<T≤50 | ±0.05 | |
| Length (continued) | L>50 | ±0.08 |
| Width | W>50 | ±0.05 |
| Width (continued) | W≥50 | ±0.08 |
Available size range: L≤200mm, W≤100mm, T: 1.5~50mm, H3~60mm
Coating Properties & Environmental Applications
| Coating Material | Colour | Properties | Environment of Application | Thickness |
|---|---|---|---|---|
| Zinc | Blue, Black and rainbow etc | Compact, Stable and Homogeneous | With reasonable capability of anticorrosion | 6um≤∮≤12 |
| Nickel-Copper-Nickel | White and black | Light and Stable | Suitable for higher corrosive environment | 15μm≤∮≤30pm |
| Phosphorization | Colorless or light gray | Uniform thickness | Short-term anticorrosion | - |
| Epoxy | Black and Gray | Layer with certain luster, insurability | Suitable for higher corrosive environment | ≥15μm |
| Parylene | Transparency | Uniform thickness, density pinholes-free and insurability | Excellent capability of anticorrosion especially for small items | 0.1μm≤∮≤100pm |
| Ni+Cu+Epoxy | Black | Layer with certain luster | Excellent capability of anticorrosion. Suitable for hostile environment (salt spray resistance>300hr) | 10-30μm |
| Al+Epoxy | Black | Layer with certain luster | Excellent capability of anticorrosion. Suitable for hostile environment (salt spray resistance>650hr). Widely used in new energy auto magnets | 15-35μm |
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Company
Xiamen Un Magnet Co.,Ltd.
Location
Room 503,Building C,No.319,Hubin East Road,Xiamen,China
Contact Person
Sales Department