Axially Magnetized Samarium Cobalt (SmCo) Cylinder Magnets are engineered for high-temperature and demagnetization-resistant industrial environments. Pressed and sintered from SmCo5 or Sm2Co17 alloys under an ISO 9001, IATF 16949, and AS9100-certified quality management system, these magnets maintain stable magnetic output up to 350°C with a minimal temperature coefficient. The magnetic orientation vector runs parallel to the central axis, establishing uniform north and south poles on the flat circular faces. Built for critical aerospace, defense, medical, and downhole equipment where magnetic degradation under thermal stress or oxidation causes system failure.
Technical Specifications
|
Parameter |
SmCo16 (Grade 16) |
SmCo28 (Grade 28) |
SmCo33 (Grade 33) |
|
Max. Energy Product (BH)max |
14 - 16 MGOe (111 - 128 kJ/m³) |
26 - 28 MGOe (207 - 223 kJ/m³) |
30 - 33 MGOe (239 - 263 kJ/m³) |
|
Remanence (Br) |
10.5 - 11.5 kGs (1.05 - 1.15 T) |
10.5 - 11.2 kGs (1.05 - 1.12 T) |
11.5 - 12.2 kGs (1.15 - 1.22 T) |
|
Coercivity (Hc) |
≥ 9.5 kOe (756 kA/m) |
≥ 10.0 kOe (796 kA/m) |
≥ 11.0 kOe (875 kA/m) |
|
Intrinsic Coercivity (Hcj) |
≥ 20 kOe (1592 kA/m) |
≥ 25 kOe (1989 kA/m) |
≥ 22 kOe (1750 kA/m) |
|
Max. Operating Temperature |
300°C |
350°C |
300°C |
|
Reversible Temp. Coeff. of Br |
-0.035%/°C |
-0.030%/°C |
-0.032%/°C |
|
Density |
8.2 g/cm³ |
8.4 g/cm³ |
8.4 g/cm³ |
Standard Dimensions: Diameter 2 mm to 100 mm, Length/Thickness 1 mm to 80 mm.
Dimensional Tolerance: Standard ±0.1 mm; Precision ground to ±0.02 mm verified via CMM inspection.
Surface Condition: Untreated (standard), Nickel (Ni-Cu-Ni), or Passivated to prevent oxidation of free iron phases.
Key Features
Exhibits near-zero irreversible flux loss up to 350°C (Sm2Co17), operating reliably in environments where Neodymium (NdFeB) magnets experience complete metallurgical breakdown.
High intrinsic coercivity (Hcj ≥ 25 kOe) prevents structural magnetic degradation under severe reverse magnetic fields or high electrical loads.
Composed of low free-iron phases compared to standard NdFeB, offering inherent oxidation resistance in humid or mildly acidic atmospheres without heavy plating.
Magnetic domains are aligned via a 2-Tesla field during powder pressing, ensuring parallel flux lines and predictable pole distribution along the longitudinal axis.
Applications
Aerospace Actuators: Brushless DC motors and valve actuators operating in high-temperature engine compartments.
Downhole Tools (MWD/LWD): Magnetic coupling devices and sensors exposed to elevated temperatures and mechanical shock in oil and gas drilling.
Precision Gyroscopes & Accelerometers: Inertial navigation systems requiring stable magnetic fields over extended operational lifecycles.
Medical MRI Instrumentation: Gradient coil assemblies and miniature focus magnets operating near high-frequency electromagnetic fields.
High-Frequency Traveling Wave Tubes: Electron beam focusing arrays in defense and radar telecommunication systems.
Customization
Manufactured to custom engineering drawings and specific magnetic performance metrics under strict configuration control.
Grade Selection:
Tailored combinations of SmCo5 and Sm2Co17 formulas adjusted for target operational temperature and energy product.
Geometric Variations:
Custom outer diameters, step cylinders, counterbored holes, or sliced segments machined via multi-axis wire-EDM.
Magnetic Calibration:
Customized flux output ranges (Flux ±1%) or specific surface field strength sorting to match rotor assembly requirements.
Coating Options:
Electroplated Nickel (10 - 25 μm), Parylene coating, or Epoxy resin encapsulation for harsh chemical environments.
Manufacturing & Quality Control
Powder Metallurgy Process: Raw metals (Sm, Co, Fe, Co, Zr) are vacuum induction melted, strip-cast, jet-milled into fine particles (3 - 5 μm), and aligned in industrial 2-Tesla magnetic field presses.
Sintering & Heat Treatment: Processed in programmable high-vacuum sintering furnaces exceeding 1150°C, followed by controlled solution and aging heat treatments to lock in the microcrystalline matrix.
Machining & Grinding: Due to the brittle nature of intermetallic SmCo compounds, parts are shaped using high-precision diamond wheel surface grinders and multi-axis CNC wire-EDM under coolant lubrication to avoid thermal micro-cracking.
Testing & Inspection: Every production lot is verified using an Advanced Hysteresis Graph (Permagraph) to measure Br, Hcj, and (BH)max. Dimensions are verified using laser micrometers and Coordinate Measuring Machines (CMM).
Packaging, Commercial Terms & Documentation
Packaged in heavy-duty corrugated cartons lined with industrial steel/iron shielding plates to contain magnetic flux leakage below IATA dangerous goods transport thresholds, separated using high-density polyethylene foam to prevent edge chipping.
Engineering evaluation samples (standard dimensions or custom prototypes) are available within 1 to 2 weeks. Minimum Order Quantities (MOQ) for production runs are tailored based on geometry and material grade.
Each shipment includes a certified Material Test Report (MTR) detailing batch chemistry, hysteresis graph test curves, CMM dimensional inspection sheets, and full ISO 9001, IATF 16949, AS9100 compliance declarations.
FAQ
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