Ultra High Temperature Samarium Cobalt Magnet: Stable Magnetic Performance for Extreme Environments
Mishma Industry (Shanghai) Co., Ltd. presents its advanced Ultra High Temperature Samarium Cobalt Magnet (SmCo) solutions, engineered for applications requiring exceptional thermal stability, corrosion resistance, and long-term magnetic reliability. As one of the most robust permanent magnet materials available today, ultra high temperature SmCo magnets are widely used in aerospace, automotive, energy, sensors, and high-precision industrial systems.
What Is an Ultra High Temperature Samarium Cobalt Magnet?
A Samarium Cobalt (SmCo) magnet is a type of rare-earth permanent magnet composed primarily of samarium (Sm) and cobalt (Co). Ultra high temperature SmCo magnets are specifically optimized to maintain magnetic strength and structural integrity even when exposed to extreme operating temperatures, typically ranging from 250°C to 350°C, with some grades capable of exceeding 350–500°C depending on composition and design.
Unlike conventional magnetic materials, SmCo magnets offer a unique combination of high magnetic energy, excellent temperature resistance, and inherent corrosion stability—making them ideal for harsh or demanding environments.
Temperature Comparison with Standard NdFeB Magnets
While NdFeB (Neodymium Iron Boron) magnets deliver very high magnetic strength at room temperature, their performance significantly drops in high-temperature environments.
Temperature resistance comparison:
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Standard NdFeB magnets:
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Maximum operating temperature: 80°C–120°C (general grades)
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High-temperature grades: 150°C–200°C, rarely up to 220°C
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Susceptible to irreversible demagnetization when overheated
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Ultra High Temperature SmCo magnets:
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Typical operating temperature: 250°C–350°C
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Special grades: 400°C–500°C
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Maintain stable magnetic performance with minimal loss
This dramatic difference makes SmCo the preferred choice for motors, sensors, actuators, and electronics exposed to continuous or intermittent high-thermal conditions.
Why SmCo Magnets Maintain Magnetism at High Temperatures
Ultra high temperature SmCo magnets exhibit remarkable thermal stability due to their intrinsic material properties:
1. High Curie Temperature
SmCo magnets have a Curie temperature typically between 700°C and 800°C, far higher than that of NdFeB.
This means the magnetic domains remain aligned even under intense heat.
2. Strong Atomic Bonding of Rare-Earth and Cobalt
The samarium–cobalt alloy structure features extremely strong atomic bonding that resists thermal agitation.
This stability prevents magnetic decay when exposed to elevated temperatures.
3. Naturally Low Temperature Coefficient
SmCo magnets have a significantly lower thermal coefficient of remanence (Br), allowing them to maintain magnetic output with minimal fluctuation over a wide temperature range.
4. Excellent Oxidation and Corrosion Resistance
Unlike NdFeB magnets, which require plating for protection, SmCo magnets are naturally corrosion resistant.
This stability helps preserve magnetic performance in chemically or thermally harsh environments.
5. Strong Resistance to Demagnetization
SmCo materials possess high intrinsic coercivity, maintaining magnetic strength even under high thermal load, strong demagnetizing fields, or rapid temperature changes.
Mishma Industry (Shanghai) Co., Ltd. provides ultra high temperature Samarium Cobalt magnets designed for precision industries that require consistent magnetic performance in extreme heat. With superior temperature resistance, excellent corrosion stability, and long-term reliability, SmCo magnets offer significant advantages over conventional NdFeB magnets for demanding applications.
https://www.mishmamagnet.com/
Mishma Industry (Shanghai) Co.,Ltd.
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