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 rare-earth components maintain structural and magnetic performance under extreme conditions.
Produced under ISO 9001 and IATF 16949 certified quality management systems, the cylinders utilize two metallurgical compositions: SmCo5 (1:5 alloy) and Sm2Co17 (2:17 alloy). Both variants offer high intrinsic coercivity ($H_{ci}$) and minimal flux variation across thermal cycles. They require no protective plating under normal atmospheric conditions due to inherent corrosion resistance, though nickel or epoxy finishes are available upon request.
Technical Specifications
|
Grade |
Residual Induction (Br) [kG / T] |
Coercivity (Hcb) [kOe / kA/m] |
Intrinsic Coercivity (Hci) [kOe / kA/m] |
Max Energy Product ((BH)max) [MGOe / kJ/m3] |
Max Operating Temp (Tmax) [°C] |
|
YXG-28 (SmCo 2:17) |
10.5 - 11.2 / 1.05 - 1.12 |
9.2 / 732 |
12.0 / 955 |
26 - 28 / 207 - 223 |
300 |
|
YXG-30 (SmCo 2:17) |
11.0 - 11.6 / 1.10 - 1.16 |
9.5 / 756 |
10.0 / 796 |
28 - 32 / 223 - 255 |
350 |
|
YXG-32 (SmCo 2:17) |
11.3 - 11.8 / 1.13 - 1.18 |
9.8 / 780 |
10.0 / 796 |
30 - 33 / 239 - 263 |
350 |
|
YX-16 (SmCo 1:5) |
8.2 - 8.9 / 0.82 - 0.89 |
7.5 / 597 |
15.0 / 1194 |
15 - 18 / 119 - 143 |
250 |
|
YX-20 (SmCo 1:5) |
8.9 - 9.6 / 0.89 - 0.96 |
8.0 / 636 |
12.0 / 955 |
18 - 22 / 143 - 175 |
250 |
Key Features
Thermal Stability: Resists irreversible demagnetization up to 350°C, outperforming standard neodymium grades (Nxx SH/UH).
High Coercivity: High Hci withstands strong opposing magnetic fields and thermal surges.
Corrosion Resistance: Stable in humid and chemical environments without heavy plating layers.
Precision Tolerances: Centerless ground outer diameters and double-end ground thickness achieve tolerances down to +/-0.02 mm.
Anisotropic Alignment: Directional magnetic pressing establishes a fixed principal axis (axial or diametral).
Mechanical Resilience: Edge-chamfering options mitigate material brittleness and withstand centrifugal loading in high-RPM rotors.
Applications
Aerospace & Defense: Gyroscopes, traveling-wave tubes (TWTs), missile telemetry sensors, and actuators.
Electric Motors & Drives: High-speed brushless DC motor rotors and aerospace actuators.
Instrumentation & Sensors: Hall-effect bias magnets, NMR probe assemblies, and precision flow meters.
Medical Devices: Implantable telemetry units, surgical tool motors, and sterilizable positioning jigs.
Energy Exploration: Downhole MWD (Measurement While Drilling) tools and high-temperature valve actuators.
Customization
Engineered to exact application constraints based on engineering prints or 3D CAD files.
Dimensional Range:
Diameter (D) 1.0 mm to 50.0 mm; Length (L) 1.0 mm to 60.0 mm.
Magnetization Direction:
Axial, diametral, or multi-pole configurations upon tooling review.
Coatings & Finishes:
Uncoated (passivated), Ni-Cu-Ni, Silver, Gold, or Epoxy resin encapsulation.
Tolerance Grinding:
Standard commercial limits (+/-0.05 mm) or precision grinding down to +/-0.01 mm.
Magnetic Sorting:
Flux sorting within strict percentage bands (+/-1% or +/-2%) for symmetrical array performance.
Manufacturing & Quality Control
Quality Standards & Compliance
• Quality Systems: Governed by IATF 16949 and ISO 9001 certified protocols for batch traceability.
• DFARS Compliance: Raw materials sourced from conflict-free supply chains meeting defense procurement requirements.
Production Workflow
• Raw Material Batching: Vacuum induction melting of high-purity Samarium (>=99.9%) and Cobalt ingots.
• Jet Milling: Particle size reduction to 3 - 5 um in an inert nitrogen atmosphere.
• Magnetic Compaction: Die pressing or isostatic pressing under a 20kOe to 30kOe directional magnetic field.
• Sintering & Solution Treatment: Sintering at 1100°C - 1210°C followed by rapid cooling.
• Aging Treatment: Post-sinter heat treatment at 800°C - 900°C to maximize coercive force.
• Machining & Grinding: Diamond wheel cutting and centerless grinding, incorporating edge chamfering.
• Magnetization & Testing: Pulse magnetization followed by 100% magnetic flux screening.
Inspection Equipment
• Hysteresis Graph Test System: Evaluates Br, Hcb, Hci, and (BH)max up to 250°C, generating lot-specific demagnetization curves.
• Helmholtz Coil Fluxmeter: Verifies total magnetic moment conformity per batch.
• CMM & Optical Comparator: Inspects diameter, concentricity, height, and edge chipping limits.
• Salt Spray Chamber: Evaluates corrosion resistance per ASTM B117.
Packaging & Documentation
Cold-rolled steel liners inside inner cartons reduce external stray fields below IATA limits (< 0.005 Gauss at 2.1 meters).
Slotted non-magnetic foam trays or individual PVC sleeves prevent edge chipping and self-demagnetization.
ESD moisture-barrier vacuum packaging with desiccant packs for transit protection.
FAQ
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