Temp Rating: 350°C, Native Corrosion Resistance, Ultra-Stable Flux
We supply precision slicing of Tiny Samarium Cobalt (SmCo) Discs for high temperature.
Neodymium magnets have strong pull force.
But they fail when exposed to high heat or corrosive elements.
Instead, SmCo Micro-Discs are more suitable for such applications.
As shown in the product photo, these magnets feature their Native Sintered Finish (Matte Metallic Grey).
Because Samarium Cobalt is inherently resistant to oxidation, it requires no heavy plating (like Nickel).
So, these tiny disc magnets are ideal for:
– Medical devices, aerospace sensors, and high-vacuum applications.
– Under such working environments, plating outgassing or flaking is a risk.
Why SmCo?
Neodymium is stronger at room temperature.
But SmCo is the professional choice for harsh conditions.
1. The “Heat Death” Solution (350°C):
The Problem:
– Standard Neodymium loses strength at 80°C.
– Even “High Temp” Neo fluctuates wildly as it warms up.
The SmCo Advantage:
– These tiny discs remain stable up to 300°C – 350°C.
– If you are designing a sensor for a car engine block or a downhole oil tool, SmCo is the only viable option.
2. Zero-Coating Required (The “Medical” Edge):
The Problem:
– Plating (Nickel/Zinc) can flake off tiny magnets, causing contamination.
The SmCo Advantage:
– SmCo is like stainless steel—it contains no iron to rust.
– We supply these “naked.”
– This is critical for Medical Devices that must be sterilized in Autoclaves (high heat + moisture).
– Because a plated Neodymium magnet would corrode and fail.
3. Thermal Stability (Low Temp Coefficient):
The Physics:
– SmCo has a very low Temperature Coefficient of Remanence (-0.03%/°C).
The Benefit:
– The magnetic pull force barely changes whether the device is freezing or burning hot.
– This consistency is mandatory for precision Hall Effect Sensors and Accelerometers.
Manufacturing Capabilities: Micro-Slicing
Material Grades:
Sm2Co17 (2:17 Series):
– The standard for high heat (350°C) and higher strength.
SmCo5 (1:5 Series):
– Older generation, easier to magnetize.
– Excellent for specific lower-power sensor calibration.
Dimensional Precision:
– Diameter: Down to 1.0mm.
– Thickness: Down to 0.5mm.
– Tolerance: ±0.05mm (Standard).
Because SmCo is brittle, we use specialized diamond saws to prevent edge chipping during the slicing process.
The “Glass” Warning
SmCo is the most brittle magnetic material in existence.
Handling:
– Treat these tiny discs like glass.
– If they snap together from a distance, they will chip or shatter.
Assembly:
– Do not use a hammer or press-fit them into tight holes without extreme care.
– We recommend gluing (Loctite/Epoxy) rather than friction-fitting.
The “Clean” Look:
– The magnets in the photo show a slightly textured surface.
– This is normal for sintered SmCo and provides excellent “tooth” for adhesives.
Ideal Applications
Medical Sterilization: Reusable medical tools that go through autoclaves.
Aerospace Avionics: Cockpit instrumentation that must withstand extreme thermal cycling.
High-Speed Rotors: Turbo-molecular pumps where friction heat is intense.
Optical Isolators: Used in fiber optic communications (laser assembly) where no plating interference is allowed.
Ordering Guide: Specifying SmCo
To quote these accurately, please provide:
1). Dimensions: Diameter x Thickness.
2). Grade: “Standard 2:17” (Recommended) or “1:5”?
3). Application Environment: “Will this be used in a vacuum or medical setting?” (Confirms that ‘Uncoated’ is the right choice).
4). Quantity: (SmCo raw material is expensive; precise quantities help us optimize the slicing yield).
