Custom Samarium Cobalt Magnet Solutions
Samarium Cobalt (SmCo) permanent magnets maintain structural integrity and magnetic output in environments where Neodymium (NdFeB) fails due to thermal demagnetization or oxidation. Jiuyi Magnetics engineers and manufactures custom SmCo magnetic components tailored to unique drawing specifications, serving high-reliability applications across aerospace, defense, and heavy industry.
Material Grades Available: Sm1Co5 and Sm2Co17 series.
Operating Range: Thermal stability up to 350 degrees Celsius with minimal magnetic flux loss.
Corrosion Resistance: High resistance to oxidation; passivation or protective coatings (Nickel, Epoxy, Parylene) are optional based on environmental exposure.
Supply Format: Fully customized prototypes, pilot production batches, and scalable series manufacturing based strictly on CAD drawings and ASTM/IEC standards.
Materials & Magnet Types
Selecting the correct alloy series determines thermal stability, magnetic output, and mechanical yield strength.
|
Material Series |
Remanence (Br) |
Coercivity (Hcb) |
Max Operating Temp |
Key Characteristics |
|
Sm1Co5 (1:5 Alloy) |
8.2 - 10.5 kG |
6.5 - 9.0 kOe |
250 degrees Celsius |
Lower magnetic energy product, superior temperature stability, easier to magnetize to saturation. |
|
Sm2Co17 (2:17 Alloy) |
10.5 - 12.5 kG |
9.0 - 15.0 kOe |
350 degrees Celsius |
High energy product (BHmax 22-33 MGOe), excellent resistance to demagnetization at elevated temperatures. |
Raw Material Control: Sourced from controlled rare-earth element suppliers with strict chemical composition verification via ICP-OES.
Alloy Selection Criteri: Match the operating temperature threshold and demagnetization curve directly to the thermal profile of the end assembly.
Custom Magnet Shapes & Dimensions
SmCo is inherently hard and brittle, requiring precision diamond tooling and Wire EDM cutting to achieve complex geometries without micro-cracking. Production experience in our machining cells shows that holding tight tolerances requires specialized slow-speed wire passes to protect crystal structures.
Blocks & Rectangles:
Minimum thickness down to 0.5 mm; max lengths up to 100 mm depending on grade.
01
Rings & Hollow Cylinders:
Diametral or axial magnetization; inner diameter (ID) grinding tolerances held routinely within plus/minus 0.02 mm on standard production runs.
02
Arcs & Segments:
Engineered for high-speed motor rotors and stator assemblies; grinding tolerance verified via optical comparator.
03
Discs & Cylinders:
Diameter range from 2 mm to 80 mm; thickness down to 0.3 mm.
04
Irregular & Custom Geometries:
Stepped blocks, wedges, and complex profiles machined via CNC slicing and multi-axis grinding.
05
Custom Magnetic Performance
Magnetic output is calibrated precisely to the operational parameters defined in engineering review.
Energy Product (BHmax): Ranging from 16 MGOe to 33 MGOe across custom grades.
Temperature Coefficient:
• Reversible temperature coefficient of residual induction alpha(Br): -0.030 percent to -0.040 percent per degree Celsius.
• Reversible temperature coefficient of coercive force beta(Hci): -0.150 percent to -0.250 percent per degree Celsius.
Magnetization Orientation: Axial, diametral, multi-pole (internal/external), radial, and specific skew angles tailored to motor dynamics.
Flux Calibration: Total magnetic flux or surface gauss output sorted to within plus/minus 1 percent or plus/minus 2 percent tolerance bands for matched assemblies.
OEM / ODM Engineering Support
Custom magnetic integration requires direct engineering collaboration from prototype conception to final production release.
Design for Manufacturability (DFM):
Engineering review of CAD models (STEP, IGES, SolidWorks) to minimize material waste, eliminate sharp internal corners, and optimize grinding paths for brittle SmCo materials.
Magnetic Circuit Simulation:
Finite Element Analysis (FEA) modeling utilizing Ansys/MagNet to predict flux density, eddy current losses, and demagnetization vulnerability under operational load.
Tolerance Stack-Up Analysis:
Evaluation of thermal expansion differentials between SmCo magnets, stainless steel sleeves, and titanium housing shafts.
Prototyping Turnaround:
Rapid sample fabrication within 10 to 15 business days using dedicated CNC slicing and manual grinding cells.
Custom Magnet Manufacturing Process
Precision manufacturing of SmCo involves rigorous powder metallurgy controls to ensure uniform density and magnetic domain alignment.
Vacuum Induction Melting & Crushing: Alloying raw Samarium and Cobalt under controlled vacuum conditions and breaking down the ingot into coarse particles.
Jet Milling: Micronizing the alloy into fine, uniform powder particles to achieve optimized single-crystal domains.
Magnetic Field Alignment & Pressing: Compressing the fine powder inside a specialized high-intensity magnetic alignment press to lock the orientation vectors in place.
Sintering: Densifying the green compacts in high-temperature vacuum furnaces to exceed 95 percent theoretical density.
Solution & Aging Heat Treatment: Stabilizing the metallurgical phase and optimizing coercivity across thermal cycles.
CNC Diamond Wire Slicing & Profile Grinding: Coolant-flooded precision machining to form final geometries without micro-cracking.
Surface Cleaning, Inspection & Magnetization: Post-processing decontamination, dimensional sorting, and final pulse magnetization.
Every production lot undergoes rigorous physical, dimensional, and magnetic verification before release to ensure zero-defect delivery. In our metrology lab, inspection protocols are executed according to MIL-STD-105E sampling standards or strict customer-defined AQL thresholds.
Magnetic Property Testing: Hysteresis graph testing via high-temperature NIM Hystograph / Permeameter systems (tested at room temperature and elevated operational points up to 300 degrees Celsius) to verify Br, Hcb, Hci, and BHmax.
Dimensional Metrology: 100 percent critical dimension checks using Keyence optical image dimensions measurement systems, coordinate measuring machines (CMM), and laser micrometer arrays.
Surface Defect Inspection:
10x magnification visual screening for edge chipping, pinholes, or micro-cracks inherent to rare-earth handling.
Flux Distribution Mapping:
Helmholtz coil testing for total magnetic moment output validation.
Traceability:
Complete material test reports (MTR) provided with every shipment, linking heat numbers, raw material chemical assay, and magnetic test curves.
Applications
SmCo magnets are deployed in mission-critical hardware operating under extreme physical and thermal stress:
Aerospace & Defense:
Actuators for flight control surfaces, traveling-wave tubes (TWT), missile guidance sensors, and high-temperature telemetry tools.
Medical Devices:
MRI gradient coils, implantable pump drives, and high-speed surgical dental handpiece motors.
Industrial & Energy:
Oil and gas logging-while-drilling (LWD) tools, high-efficiency servo motors operating in ambient temperatures above 200 degrees Celsius, and aerospace fuel pumps.
Sensors & Instrumentation:
Hall-effect sensor arrays, precision gyroscopes, and microwave communication devices.
How to Start a Custom Magnet Project
Initiating a custom component run requires specific technical inputs to streamline engineering evaluation and quotation.
Submit Engineering Drawings: Provide 2D/3D CAD files (.STEP, .DWG, .PDF) detailing dimensions, geometric tolerances, and coating requirements.
Define Operating Parameters: Specify maximum operating temperature, continuous versus peak operational load, environment exposure (vacuum, humidity, chemical contact), and assembly method (gluing, mechanical clamping, laser welding).
Specify Magnetic Requirements: Indicate required grade (e.g., Sm2Co17), magnetization direction, and acceptable flux tolerance band.
Engineering Review & DFM Feedback: Technical team evaluates machinability, tooling requirements, and delivers formal quotation within 24 to 48 hours.
Prototype Validation: Sample delivery accompanied by full dimensional inspection reports and magnetic test curves for verification prior to volume production.
FAQ