Samarium Cobalt (SmCo) cylinder magnets provide stable magnetic performance in environments where Neodymium (NdFeB) fails due to thermal demagnetization. Built under AS9100D and ISO 9001 certified quality management systems from rare-earth alloys (SmCo5 and Sm2Co17), these cylindrical permanent magnets maintain structural and magnetic integrity up to 350°C.
Engineered for demanding industrial applications requiring high coercive force, our SmCo cylinders resist oxidation and corrosion without heavy plating, though Nickel or Parylene coatings are available upon request. Each sintering lot undergoes hysteresis graph testing on a BH Curve Tracer to verify magnetic flux output prior to shipment.
Technical Specifications
|
Parameter |
SmCo5 Grades (e.g., YXG18 - YXG28) |
Sm2Co17 Grades (e.g., YXG28H - YXG33H) |
|
Max. Energy Product (BH)max |
16 - 28 MGOe (128 - 223 kJ/m³) |
24 - 33 MGOe (191 - 263 kJ/m³) |
|
Remanence (Br) |
8.2 - 10.8 kGs |
10.5 - 12.2 kGs |
|
Intrinsic Coercivity (Hcj) |
≥ 15 - 25 kOe |
≥ 20 - 30 kOe |
|
Max. Operating Temperature |
250°C |
350°C |
|
Curie Temperature (Tc) |
700°C - 750°C |
800°C - 825°C |
|
Temp. Coefficient of Br (α) |
-0.045% / °C |
-0.030% / °C |
|
Density |
8.2 - 8.4 g/cm³ |
8.4 - 8.5 g/cm³ |
|
Standard Tolerances |
Outer Diameter: ±0.05 mm, Length: ±0.05 mm (Grindable to ±0.01 mm) |
Key Features
Thermal Stability: Retains magnetic flux density at continuous operating temperatures up to 350°C with minimal irreversible thermal loss.
High Coercive Force: Resists demagnetization caused by opposing magnetic fields, mechanical shock, or high-temperature spikes.
Oxidation Resistance: Contains low free iron content compared to Neodymium alloys, eliminating the mandatory requirement for protective plating in dry environments.
Anisotropic Orientation: Aligned during a strong magnetic field pressing process utilizing multi-ton hydraulic presses, ensuring targeted vector flux output along the specified axis (axial or diametrical).
Precision Grindability: Sintered material allows diamond-wheel grinding to achieve tight assembly clearances for high-speed rotors and sensors.
Applications
Actuators, sensor feedback units, traveling-wave tubes (TWTs), and guidance systems operating under extreme thermal fluctuations.
MWD (Measurement While Drilling) tools, downhole telemetry sensors, and high-temperature valve actuators exposed to corrosive mud and temperatures exceeding 250°C.
High-speed brushless DC motors, aerospace fuel pumps, and eddy current couplings requiring stable air-gap fields.
Hall-effect sensors, calibration standards, medical diagnostic devices, and scientific instruments demanding long-term magnetic constancy.
Customization
Manufacturing operations support custom geometrical, physical, and magnetic requirements based on STEP/IGES drawings or engineering specifications:
Dimensions:
Diameters from 1 mm to 100 mm, lengths from 0.5 mm to 150 mm.
Tolerances:
Precision diamond-wheel grinding achieves outer diameter and thickness tolerances down to ±0.01 mm.
Magnetization Direction:
Axial, diametrical, multi-pole, or customized skewed magnetic vectors.
Coatings:
Uncoated (passivated), Nickel-Copper-Nickel (Ni-Cu-Ni), Zinc, Epoxy, or Parylene C coating to protect against aggressive chemical exposure.
Flux Sorting:
Custom sorting into tight flux output bins (ΔB / B < 1%) for multi-pole rotor assemblies.
Manufacturing & Quality Control
Production Workflow
Raw materials (Samarium and Cobalt ingots) undergo vacuum induction melting, hydrogen decrepitation (HD), jet milling into fine powder (3-5 μm), magnetic field pressing using automated hydraulic presses, vacuum sintering furnaces, and precise solid-state heat treatment.
Inspection Equipment & Standards
• Magnetic Property Testing: Hysteresis graphs via BH Curve Tracers measure Br, Hcb, Hcj, and (BH)max on samples from every sintering lot.
• Dimensional Verification: CNC optical comparators, laser micrometer systems, and coordinate measuring machines (CMM) verify tolerance compliance.
• Surface & Internal Defect Inspection: Eddy current sorting and metallurgical microscopes check for micro-cracks, chipping, and porosity.
• Traceability & Certifications: Operations adhere strictly to ISO 9001 and AS9100D quality frameworks. Raw material lot numbers, sintering logs, and test reports link directly to unit shipment cartons.
Packaging & Documentation
Due to strong rare-earth magnetic fields, cylinders are packaged in compliant flux-containment packaging (iron-shielded boxes padded with high-density foam). Stray magnetic field measurements at external package boundaries comply with IATA packing instruction regulations for air freight and surface transport.
Rare-earth magnets possess high energy density and brittle mechanical properties. Uncontrolled snap-together collisions can cause high-velocity chipping or fragmentation. Personnel handling assembly should utilize non-magnetic positioning jigs and wear protective eyewear.
• Material Test Report (MTR): Including actual Br, Hcj, and (BH)max batch data.
• Certificate of Conformance (CoC): Referencing drawing revision numbers and AS9100D traceability logs.
• Material Safety Data Sheet (MSDS): And DFARS compliance statement upon request.
FAQ
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