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There are significant differences between neodymium iron boron strong magnets and samarium cobalt high-temperature resistant magnets in multiple aspects:

Magnetic properties: Neodymium iron boron magnets have extremely high magnetic field strength and are high-performance permanent magnet materials. Although samarium cobalt magnets have excellent magnetic properties, their biggest feature is their high temperature resistance.

High temperature resistance: The magnetic properties of neodymium iron boron magnets are affected at high temperatures, and their maximum operating temperature is generally around 180 degrees Celsius. However, samarium cobalt magnets have excellent high-temperature resistance, with a maximum operating temperature of 350 degrees Celsius, and can maintain good magnetic properties even at higher temperatures.

Temperature coefficient: The temperature coefficient (Br temperature coefficient) of samarium cobalt magnets is only -0.03%~0.05%/℃, which means that at high temperatures, the magnetic properties of samarium cobalt magnets decrease less. The temperature coefficient of neodymium iron boron magnets is relatively high, ranging from 0.45% to 0.60%/℃, so their magnetic properties are more easily affected at high temperatures.

Application areas: Due to its high magnetic field strength, neodymium iron boron magnets are widely used in fields that require high-performance magnetism, such as motors, sensors, electroacoustic equipment, etc. Samarium cobalt magnets, due to their high temperature resistance, are more commonly used in fields that require high-temperature environments, such as aerospace, automotive manufacturing, etc.

Cost and raw materials: Neodymium iron boron magnets have relatively abundant raw materials and lower costs, making them more popular in the market. However, the raw materials for samarium cobalt magnets are relatively few and the cost is high, making their prices relatively high.

In summary, there are significant differences between neodymium iron boron strong magnets and samarium cobalt high-temperature resistant magnets in terms of magnetic properties, high-temperature resistance, temperature coefficient, application areas, and cost. When choosing to use, it is necessary to weigh and choose based on specific application scenarios and requirements.