Samarium Cobalt (SmCo) disc magnets maintain magnetic flux density and structural stability in thermal environments exceeding 250°C. Composed of SmCo5 and Sm2Co17 alloy systems, these rare-earth permanent magnets feature high intrinsic coercivity (Hci) and a low reversible temperature coefficient of remanence (-0.035%/°C for Sm2Co17).
Unlike Neodymium (NdFeB) variants that degrade above 150°C, SmCo operates continuously up to 300°C–350°C. High resistance to thermal demagnetization makes them specified components for aerospace actuators, military telemetry, high-speed electric motors, and high-temperature magnetic couplings.
Technical Specifications
|
Parameter |
SmCo5 Grades (YX18 - YX24) |
Sm2Co17 Grades (YXG28 - YXG32) |
|
Remanence (Br), Gauss |
8,500 – 10,500 |
10,500 – 12,200 |
|
Energy Product ((BH)max), MGOe |
15 – 24 |
22 – 32 |
|
Coercivity (Hcb), Oe |
>= 7,000 |
>= 9,500 |
|
Intrinsic Coercivity (Hci), Oe |
>= 15,000 |
>= 12,000 |
|
Max Operating Temperature |
250°C |
300°C – 350°C |
|
Reversible Temp. Coeff. of Br |
-0.045% / °C |
-0.030% to -0.035% / °C |
|
Density (g/cm3) |
8.2 – 8.4 |
8.4 – 8.5 |
|
Standard Tolerances |
+/- 0.05 mm (OD & Thickness) |
+/- 0.05 mm (OD & Thickness) |
Key Features
Continuous operation up to 350°C with minimal irreversible flux loss.
High cobalt and minimal iron content provide natural corrosion resistance without requiring standard electroplating.
High resistance to external demagnetizing fields, ensuring stable air-gap flux over long lifecycles.
Magnetic domains aligned during pressing to establish fixed directional vectors.
Applications
Aerospace & Defense: Actuators, sensors, missile telemetry, and radar systems subject to thermal cycling.
Electric Motors: Rotor assemblies for high-speed brushless DC motors and high-frequency alternators.
Sensors & Instrumentation: Traveling-wave tubes, klystrons, atomic clocks, and magnetron tubes.
Industrial Systems: High-temperature magnetic pumps, eddy current brakes, and chemical processing couplings.
Customization Capabilities
Dimensions:
Diameters from 2 mm to 100 mm; thicknesses from 0.5 mm to 50 mm.
Magnetization Direction:
Axial (through thickness) or diametral. Multi-pole patterns subject to engineering review.
Coatings:
Uncoated (passivated), Nickel-Copper-Nickel (Ni-Cu-Ni), Zinc, or Parylene for edge-chip protection.
Tolerance Class:
Precision ground finishes meeting ISO 2768-mH or tighter custom targets.
Manufacturing & Quality Control
Alloying & Melting: Vacuum induction melting of high-purity Samarium, Cobalt, Iron, Copper, and Zirconium.
Jet Milling: Reduction of alloy ingots into uniform powders (3–5 um).
Magnetic Pressing: Isostatic or die pressing aligned within an external magnetic field.
Sintering & Aging: High-temperature sintering followed by thermal aging to lock metallurgical phases and maximize coercivity.
Machining: Wire EDM and diamond wheel grinding. Diamond tooling is utilized to mitigate micro-cracking in brittle material.
Testing: Flux output and hysteresis verification via Hysteresisgraphs and Helmholtz Coils. Optical dimensional inspection.
Packaging & Logistics
Packaging Protocol: Individual anti-static compartments separated by high-density non-magnetic foam spacers. Outer corrugated cartons lined with magnetic shielding steel sheets to suppress stray fields and comply with IATA dangerous goods regulations.
Documentation: Material Test Report (MTR) with batch Br, (BH)max, and Hci metrics; Certificate of Conformance (CoC); Safety Data Sheet (SDS).
FAQ
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