Samarium Cobalt (SmCo) block magnets deliver stable magnetic performance in environments where Neodymium (NdFeB) fails due to thermal demagnetization. Utilizing a sintered rare-earth alloy of samarium and cobalt (Sm2Co17 and SmCo5), these rectangular components maintain magnetic remanence across operating temperatures up to 350°C.
Engineered for high-reliability assemblies, these blocks undergo precision diamond grinding to achieve parallel and flat surfaces essential for air-gap critical applications. Unlike NdFeB, SmCo exhibits inherent resistance to oxidation, eliminating the absolute requirement for nickel plating in standard atmospheric conditions.
Technical Specifications
|
Parameter |
SmCo5 Series (YXG-16 to YXG-28) |
Sm2Co17 Series (YXG-24H to YXG-32H) |
|
Remanence (Br) |
8.2 – 10.5 kGs (0.82 – 1.05 T) |
10.5 – 12.5 kGs (1.05 – 1.25 T) |
|
Max. Energy Product ((BH)max) |
16 – 28 MGOe (128 – 223 kJ/m3) |
24 – 32 MGOe (191 – 254 kJ/m3) |
|
Coercive Force (Hcb) |
>= 7.5 kOe |
>= 9.5 kOe |
|
Intrinsic Coercivity (Hcj) |
>= 15.0 kOe |
>= 15.0 kOe |
|
Max. Operating Temperature |
250°C |
300°C - 350°C |
|
Temp. Coefficient of Br (alpha) |
-0.045% / °C |
-0.030% / °C |
|
Density |
8.2 g/cm3 |
8.4 g/cm3 |
|
Dimensional Tolerance |
+- 0.05 mm (Ground surfaces) |
+- 0.05 mm (Ground surfaces) |
Key Features
Low reversible temperature coefficient maintains predictable flux output across cycles up to 350°C.
High Hcj prevents structural demagnetization under opposing magnetic fields or high heat.
Stable alloy matrix resists oxidation in humid environments without barrier plating.
Sintered structure holds tight geometrical limits via multi-axis CNC grinding for direct air-gap assembly.
Applications
Aerospace Actuators & Sensors: Linear and rotary units in variable-temperature compartments.
High-Speed Motors: Rotor assemblies for industrial servo motors under centrifugal and thermal stress.
Traveling-Wave Tubes (TWTs): Microwave amplification devices in communication systems.
Magnetic Couplings: Hermetically sealed pump drives handling high-temperature fluids.
Medical & Analytical Instruments: Beam steering components in NMR and mass spectrometers.
Customization Parameters
Dimensions:
Lengths from 5 mm to 100 mm; tolerances down to +- 0.015 mm via precision grinding.
Magnetic Sorting:
Tuned Hcj and (BH)max grading to eliminate flux variance in multi-pole assemblies.
Coatings:
Uncoated (standard), Nickel (Ni-Cu-Ni), Titanium (Ti), or Parylene C.
Machined Features:
Slots, steps, chamfers, or holes executed via ultrasonic drilling prior to magnetization.
Manufacturing & Quality Control
Production adheres to ISO 9001 and AS9100-aligned process controls, maintaining a Cpk >= 1.33 for magnetic flux consistency across batch runs:
Alloy Processing: Vacuum induction melting (VIM) and jet milling for strict particle size distribution.
Compaction & Sintering: High-intensity magnetic field pressing aligned to the easy magnetization axis, followed by vacuum sintering.
Machining: Diamond wheel slicing and surface grinding under coolant to eliminate micro-cracking in brittle rare-earth materials.
Inspection:
• Hysteresisgraph and Helmholtz coil fluxmeter testing (Br, Hcb, Hcj, (BH)max).
• 3D CMM dimensional verification.
• Optical microscopy for edge chipping.
Packaging & Documentation
Packaging:
Individual closed-cell foam cavities inside steel-shielded containers, attenuating external magnetic fields to meet IATA air transport regulations.
Documentation:
Shipments include Certificate of Analysis (CoA), dimensional inspection reports, Mill Test Certificates (MTC), and MSDS.
Compliance & Export Standards
Environmental Directives: Fully compliant with RoHS and REACH regulations.
Material Sourcing: Aligned with Conflict Minerals reporting frameworks (CMRT).
Traceability: Full lot traceability from raw metal melt logs to finished components, supporting ITAR/EAR compliance reviews.
Design & Engineering Support
DFMA Review: Pre-production evaluation of block dimensions and feature placements to prevent stress concentrations in sintered material.
CAD Integration: Provision of standard 3D CAD models (STEP/IGES) and magnetic simulation data to evaluate air-gap flux density.
FAQ
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