Product Overview
SmCo ring magnets maintain stable magnetic output in high-temperature environments where standard Neodymium grades experience irreversible flux loss. Composed of Samarium and Cobalt (1:5 and 2:17 alloy structures), these permanent magnets operate reliably up to 350°C with low thermal coefficients.
Golds-Magnets sintered SmCo ring magnets built to engineering drawings via induction melting, jet milling, magnetic field compaction, and vacuum sintering.
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![Custom Samarium Cobalt Ring Magnets]()
Custom Samarium Cobalt Ring MagnetsCustom Samarium Cobalt (SmCo) ring magnets maintain magnetic flux stability across thermal and corrosive operating environments. Manufactured via powder metallurgy, these rare-earth permanent magnets retain performance up to 300°C (572°F)read more -
![Radially Magnetized Samarium Cobalt Ring Magnets]()
Radially Magnetized Samarium Cobalt Ring MagnetsRadially Magnetized SmCo Ring Magnets deliver a uniform magnetic field along the radial axis for high-efficiency rotor assemblies and precision sensor systems. Formed from vacuum induction melted Sm2Co17 and SmCo5 rare-earth alloys, theseread more -
![Axially Magnetized Samarium Cobalt Ring Magnets]()
Axially Magnetized Samarium Cobalt Ring MagnetsAxially magnetized Samarium Cobalt (SmCo) ring magnets feature a magnetic orientation parallel to the central geometric axis, generating a uniform flux distribution along the bore length. Composed of rare-earth SmCo5 (Series 1:5) orread more -
![Large Samarium Cobalt Ring Magnets]()
Large Samarium Cobalt Ring MagnetsGolds-Magnets manufactures sintered large samarium cobalt ring magnets engineered for applications requiring structural stability under elevated thermal loads and oxidative conditions. Unlike NdFeB alternatives, SmCo magnets maintainread more -
![Thin-Wall Samarium Cobalt Ring Magnets]()
Thin-Wall Samarium Cobalt Ring MagnetsThin-wall Samarium Cobalt ring magnets are engineered for high-temperature and demagnetization-resistant applications where radial space is severely restricted. Fabricated from rare-earth SmCo5 and Sm2Co17 alloys, these magnets maintainread more -
![Standard Samarium Cobalt Ring Magnets]()
Standard Samarium Cobalt Ring MagnetsDongGuan Golds-magnets manufactures standard sintered Samarium Cobalt (SmCo) ring magnets engineered for high-temperature and demagnetization-resistant applications. Utilizing certified SmCo5 (1:5 series) and Sm2Co17 (2:17 series)read more
Product Types
5 Rings:
Moderate energy density (16 MGOe to 24 MGOe) with linear demagnetization curves. Selected for instruments requiring predictable thermal behavior.
17 Rings:
High magnetic output (22 MGOe to 32 MGOe) for operational limits up to 350°C. Utilized in heavy-duty motors and aerospace actuators.
Diametrically Magnetized Rings:
Magnetic vector oriented perpendicular to the central axis for multi-pole sensor rotors and brushless DC motors.
Axially Magnetized Rings:
Magnetic flux flows parallel to the central hole for magnetic bearings, traveling wave tubes, and coupling assemblies.
Technical Specifications
|
Property / Parameter |
SmCo1:5 Grade Range |
SmCo2:17 Grade Range |
|
Remanence (Br) |
8.2 - 10.5 kGs (0.82 - 1.05 T) |
10.0 - 12.5 kGs (1.00 - 1.25 T) |
|
Coercivity (Hcb) |
7.5 - 9.0 kOe |
9.0 - 11.5 kOe |
|
Intrinsic Coercivity (Hcj) |
>= 15 - 25 kOe |
>= 20 - 30 kOe |
|
Max. Energy Product ((BH)max) |
16 - 24 MGOe (128 - 191 kJ/m3) |
22 - 32 MGOe (175 - 254 kJ/m3) |
|
Max. Operating Temperature |
250°C |
350°C |
|
Reversible Temp. Coeff. of Br |
-0.045% /°C |
-0.030% /°C |
|
Density |
8.2 - 8.4 g/cm3 |
8.4 - 8.5 g/cm3 |
|
Standard Tolerances |
Outer/Inner Diameter ± 0.05 mm, Thickness ± 0.05 mm |
Outer/Inner Diameter ± 0.05 mm, Thickness ± 0.05 mm |
Key Features
Curie Points:
Reach 700°C to 800°C, enabling high-temperature operation.
Corrosion Resistance:
Low free iron content minimizes oxidation risks without mandatory coatings.
High Coercivity (Hcj):
Resists external demagnetizing fields and thermal shocks.
Anisotropic Structure:
Aligned magnetic domains yield directional flux density.
Aerospace & Defense: Gyroscopes, traveling wave tubes, and satellite actuators.
High-Performance Motors: Brushless DC motors, high-speed spindles, and servo motors in heat-constrained housings.
Downhole Oil & Gas: MWD (Measurement While Drilling) tools and logging instruments.
Sensors & Instrumentation: Flow meters, magnetic couplings, and precision tachometers.
Customization
Built from CAD drawings (.STEP, .DWG, .PDF).
Dimensions:
Outer diameter 3 mm to 150 mm; inner diameter and thickness machined to spec.
Magnetization:
Axial, diametral, multi-pole, or specialized skew patterns.
Coatings:
Uncoated (passivated), Ni-Cu-Ni, Silver, Gold, or Parylene.
Tolerances:
Precision grinding achieves outer/inner diameter tolerances down to ± 0.01 mm upon review.
Melting & Alloying: Vacuum induction melting of raw elements.
Jet Milling: Alloy reduction to 3 - 5 um powders via nitrogen mills.
Compaction: Hydraulic pressing inside aligned magnetic fields.
Sintering: Vacuum furnace densification and heat treatment.
Machining: Wire EDM and diamond wheel grinding with coolant systems to prevent micro-cracks.
Testing: Hysteresis graph analysis (Br, Hcj, (BH)max), CMM dimensional checks, and flux mapping.
Packaging & Documentation
Packaging: Steel-shielded boxes with air-gap spacing compliant with IATA and maritime freight rules.
Documentation: Material Test Report (MTR), dimensional inspection report, Certificate of Conformance (CoC), and MSDS.
FAQ
We're professional samarium cobalt ring magnets manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized samarium cobalt ring magnets at competitive price from our factory.
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