Product Overview
Samarium Cobalt disc magnets deliver stable magnetic performance in operating environments exceeding 250°C, where NdFeB alternatives experience severe flux loss. Composed of SmCo5 (1:5) and Sm2Co17 (2:17) alloy systems, these rare-earth permanent magnets maintain high intrinsic coercivity (Hci) against demagnetization without requiring protective electroplating in standard dry atmospheres.
Golds-Magnets sintered SmCo disc magnets to client drawings using precision wire EDM, internal grinding, and custom alignment presses. Each production batch undergoes hysteresis graph testing to verify remanence (Br), coercivity (Hcb and Hci), and maximum energy product (BHmax) against ASTM A977 standards.
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![Precision Samarium Cobalt Disc Magnets]()
Precision Samarium Cobalt Disc MagnetsSamarium Cobalt (SmCo) disc magnets retain magnetic stability in high-temperature and chemically corrosive environments where Neodymium (NdFeB) magnets degrade or oxidize. Composed of rare-earth Samarium and Cobalt, these discs operateread more -
![High Coercivity Samarium Cobalt Disc Magnets]()
High Coercivity Samarium Cobalt Disc MagnetsGolds-Magnets produces sintered high coercivity Samarium Cobalt disc magnets tailored for high-temperature motors, sensors, and aerospace actuators. Operating reliably up to 350°C, these Sm2Co17 and SmCo5 rare-earth magnets maintain stableread more -
![High Temperature Samarium Cobalt Disc Magnets]()
High Temperature Samarium Cobalt Disc MagnetsGolds-Magnets manufactures Samarium Cobalt (SmCo) disc magnets for continuous operation in thermal environments up to 350°C. Produced via powder metallurgy using SmCo5 and Sm2Co17 alloys, these magnets maintain magnetic stability withoutread more -
![Thin Samarium Cobalt Disc Magnets]()
Thin Samarium Cobalt Disc MagnetsThin Samarium Cobalt (SmCo) disc magnets maintain magnetic stability up to 350°C with minimal temperature coefficients. Jiuyi Machine produces micro-thin discs starting from 0.5 mm thickness, holding dimensional tolerances within +/-0.02read more -
![Small Samarium Cobalt Disc Magnets]()
Small Samarium Cobalt Disc MagnetsSmall Samarium Cobalt (SmCo) disc magnets provide stable flux retention in thermal environments up to 350°C, a threshold where NdFeB grades suffer irreversible structural degradation. Manufactured from SmCo5 (1:5 series) and Sm2Co17 (2:17read more -
![Standard Samarium Cobalt Disc Magnets]()
Standard Samarium Cobalt Disc MagnetsSamarium 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 intrinsicread more
Product Types
|
Material Grade |
Residual Induction (Br) |
Max Operating Temp |
Primary Characteristic |
|
SmCo 1:5 (YXG-16 to YXG-24) |
8.2 - 10.5 kGs |
250°C |
Lower temperature coefficient of remanence; stable across moderate thermal cycles. |
|
SmCo 2:17 (YXG-28 to YXG-33) |
10.5 - 12.0 kGs |
350°C |
Maximum energy product for high-temperature motors and actuators. |
Standard Dimensions: Diameters from 2 mm to 100 mm; thicknesses from 0.5 mm to 50 mm.
Tolerances: Standard +/- 0.1 mm; precision-ground down to +/- 0.02 mm.
Magnetization: Axial (standard) or diametrical (custom fixture required).
Technical Specifications
|
Specification |
Details |
|
Density |
8.2 g/cm3 to 8.4 g/cm3 |
|
Curie Temperature |
700°C to 825°C |
|
Reversible Temperature Coefficient of Br |
-0.030% / °C to -0.040% / °C |
|
Vickers Hardness |
~550 HV |
|
Flexural Strength |
150 MPa |
|
Finishes |
As-cut (uncoated), Nickel-plated (Ni-Cu-Ni), or Passivated. |
Key Features
Thermal Stability:
Retains magnetic flux output up to 350°C with negligible irreversible losses.
Corrosion Resistance:
High cobalt content (~65%) provides intrinsic oxidation resistance without thick plating in non-acidic environments.
Coercivity Retention:
High resistance to demagnetization from external fields and opposing armature reactions at elevated temperatures.
Anisotropic Alignment:
Magnetic domains aligned during pressing under an external field to maximize vector flux density.
Aerospace & Defense: Actuators, telemetry transmitters, and sensors in engine nacelles.
Motors & Generators: High-speed brushless DC motors, alternators, and magnetic gearboxes.
Medical Devices: MRI gradient coils, surgical tool drives, and diagnostic equipment.
Oil & Gas Downhole Tools: MWD sensors and telemetry systems exposed to extreme heat and shock.
Customization Capabilities
Machining:
Precision slicing, OD/ID grinding, and wire EDM profiling from CAD data.
Magnetic Grading:
Tailored Hci levels to prevent demagnetization under specific peak load conditions.
Integration:
Direct bonding of discs into titanium, stainless steel, or aluminum housings using high-temperature structural epoxy.
Identification:
Traceability laser etching on disc faces.
Production Workflow
• Melting & Alloying: Vacuum induction melting under strict stoichiometric ratios.
• Jet Milling: Pulverization into fine powder under inert nitrogen gas.
• Pressing: Isostatic or die pressing under a 20+ kOe aligning magnetic field.
• Sintering & Aging: Solid-state vacuum sintering followed by multi-stage aging treatments.
• Finishing: Diamond wheel grinding and wire EDM cutting to print.
Inspection Protocols
• Hysteresis Graph Testing: 100% room-temperature magnetic property verification using loop tracers against ASTM A977.
• Thermal Flux Testing: Sample testing of magnetic output decay up to 300°C.
• Metrology: Optical comparators and laser micrometers verifying dimensions and parallelism.
• Visual Screening: 10x magnification check for edge chipping, micro-cracks, and surface voids.
Packaging & Documentation
Packaging: Individually separated non-magnetic plastic spacers or multi-layer cardboard shielding to prevent mechanical impact and flux cancellation. Complies with IATA regulations for magnetized air cargo.
Documentation: Certificate of Analysis (CoA) detailing actual Br, Hcb, Hci, and BHmax per heat lot; Material Safety Data Sheet (MSDS); dimensional inspection report.
FAQ
We're professional samarium cobalt disc magnets manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized samarium cobalt disc magnets at competitive price from our factory.
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Standard Samarium Cobalt Arc MagnetsStandard Samarium Cobalt (SmCo) arc magnets are engineered for high-temperature and thermally stable permanent magnetread more
