China Samarium Cobalt Cylinder Magnets Manufacturers, Suppliers and Factory

Product Overview

Samarium Cobalt (SmCo) Cylinder Magnets provide stable magnetic output in high-temperature or corrosive environments where neodymium materials fail. Produced via powder metallurgy, including vacuum induction melting, jet milling, magnetic field alignment, and vacuum sintering, these permanent magnets retain magnetic integrity up to 350°C (Sm2Co17 series).
Golds-Magnets supplies precision-ground SmCo cylinders engineered for applications requiring strict outer diameter tolerances, tight concentricity, and uniform flux distribution.

Radially Magnetized Samarium Cobalt Cylinder Magnets
Radially magnetizing a permanent magnet cylinder requires specialized orientation tooling during the pressing phase to align the magnetic domains along the radius rather than the axial or diametral axis. Sm2Co17 and Sm1Co5 cylinder magnets
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Axially Magnetized Samarium Cobalt Cylinder Magnets
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
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High Temperature Samarium Cobalt Cylinder Magnets
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
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Long Samarium Cobalt Cylinder Magnets
Long Samarium Cobalt cylinder magnets provide a high-coercivity rare-earth solution for high-temperature and harsh-environment assemblies where conventional Neodymium alternatives suffer irreversible thermal flux loss. Fabricated using
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Small Samarium Cobalt Cylinder Magnets
Standard Samarium Cobalt (SmCo) permanent rare-earth cylindrical magnets provide stable magnetic output in high-temperature or corrosive environments where NdFeB materials degrade. Operating across a thermal range of -269°C to 350°C, these
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Standard Samarium Cobalt Cylinder Magnets
Standard Samarium Cobalt (SmCo) cylinder magnets provide stable magnetic flux in thermal environments where neodymium grades experience structural demagnetization. Produced via powder metallurgy from sintered intermetallic alloys (SmCo5 or
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Product Types

SmCo5 (1:5 Alloy): Moderate energy products (16 to 24 MGOe) with low temperature coefficients. Maintains linear output up to 250°C.

Sm2Co17 (2:17 Alloy): High energy products (22 to 33 MGOe) with superior demagnetization resistance. Rated for continuous operation up to 350°C.

Magnetization Direction:
• Axial: Poles on flat ends (standard for linear actuators and sensors).
• Diametrical: Poles across the diameter (utilized in high-speed rotors and couplings).

Technical Specifications

Material Grade	Remanence (Br) [kGs / T]	Coercive Force (Hcb) [kOe / kA/m]	Intrinsic Coercivity (Hcj) [kOe / kA/m]	Max. Energy Product ((BH)max) [MGOe / kJ/m3]	Max. Operating Temp. [°C]
YXG-28 (Sm2Co17)	10.5 - 11.0 / 1.05 - 1.10	>= 9.5 / >= 756	>= 12.0 / >= 955	26 - 29 / 207 - 231	350
YXG-30 (Sm2Co17)	11.0 - 11.5 / 1.10 - 1.15	>= 10.0 / >= 796	>= 15.0 / >= 1194	28 - 32 / 223 - 255	350
YXG-32 (Sm2Co17)	11.3 - 11.8 / 1.13 - 1.18	>= 10.5 / >= 836	>= 20.0 / >= 1592	30 - 33 / 239 - 263	350
YX-18 (SmCo5)	8.5 - 9.0 / 0.85 - 0.90	>= 8.0 / >= 636	>= 15.0 / >= 1194	16 - 20 / 127 - 159	250
YX-22 (SmCo5)	9.3 - 9.8 / 0.93 - 0.98	>= 8.5 / >= 676	>= 20.0 / >= 1592	21 - 24 / 167 - 191	250

Key Features

Thermal Stability:

Remanence temperature coefficient approx. -0.035% / °C (Sm2Co17), minimizing flux loss at elevated temperatures.

Coercivity:

High intrinsic coercivity prevents irreversible demagnetization under opposing magnetic loads.

Corrosion Resistance:

Contains >60% cobalt, offering baseline resistance to oxidation without protective plating. Passivated finish is standard.

Anisotropic Alignment:

Compacted under >20 kOe magnetic fields to maximize directional remanence.

Radially Magnetized Samarium Cobalt Cylinder Magnets

Applications

Aerospace & Defense: Actuators, feedback sensors, gyroscopes, and microwave tubes.

High-Temp Motors: Brushless DC motor rotors, fuel pumps, and servo drives operating >150°C.

Oil & Gas: MWD logging tools and high-temperature magnetic drives.

Medical: Traveling-wave tubes and high-speed dental drill motors.

Customization

Dimensions:

Diameter 2 mm to 100 mm; Length 2 mm to 150 mm.

Machining:

Diamond wire EDM and centerless grinding (Ra 0.4 micron).

Coatings:

Uncoated (passivated), Ni-Cu-Ni, Silver, Gold, or Parylene.

Magnetic Sorting:

Calibrated magnetic moment sorting (+/- 1% flux matching).

Manufacturing & Quality Control

Production Process Flow
Raw Material Proportioning -> Vacuum Induction Melting -> Jet Milling -> Magnetic Field Compaction -> Vacuum Sintering -> Aging Heat Treatment -> Diamond Grinding & Wire EDM -> Pulse Magnetization -> Testing.

Quality Protocols
• Sintering: Closed-loop vacuum furnaces (+/- 2°C uniformity) paired with multi-stage aging.
• Inspection: CNC optical comparators and laser micrometers for GD&T verification.

Testing:
• Hysteresis Graph Test: 100% lot verification of Br, Hcb, Hcj, and (BH)max at room temperature and 300°C.
• Thermal Shock Screening: 100 cycles between -40°C and +300°C to verify structural integrity.

High Temperature Samarium Cobalt Cylinder Magnets

Packaging & Documentation

Packaging: Low-carbon steel flux shims and anti-static foam shielding. Complies with IATA Dangerous Goods Regulations (Packing Instruction 953); external field strength tested <0.00525 Gauss (0.525 micro-Tesla) at 2.1 meters.

Documentation: Material Test Report (MTR) with batch chemical/magnetic data, Certificate of Conformance (CoC), MSDS, and DFARS compliance statements upon request.

FAQ

Q: How do SmCo cylinders compare to NdFeB at elevated temperatures?

A: SmCo operates up to 350°C with minimal flux loss, whereas standard Neodymium degrades significantly above 150°C to 200°C and risks permanent structural demagnetization.

Q: How should brittle SmCo cylinders be handled during assembly?

A: Given a Vickers hardness of approx. 500 HV and low tensile strength, avoid heavy interference press-fits. Utilize running clearances with high-temperature structural epoxies (such as cyanate ester or bismaleimide) or non-ferrous clamping sleeves.

Q: Are protective coatings necessary?

A: No. Because SmCo contains >60% cobalt, standard passivation is sufficient for most industrial atmospheres. Plating is optional, reserved for cleanrooms, high-vacuum outgassing control, or severe chemical exposure.

Q: What are the typical lead times?

A: Stock blanks ship in 3 to 5 business days. Custom dimensions requiring EDM, precision grinding, and thermal aging require 3 to 4 weeks.

We're professional samarium cobalt cylinder magnets manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized samarium cobalt cylinder magnets at competitive price from our factory.

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