Ningbo Ketian Magnet CO.,LTD.
Ningbo Ketian Magnet CO.,LTD.

Understanding the Working Temperature of Sintered NdFeB Magnets

May 21 , 2024

Sintered NdFeB magnets, revered for their exceptional magnetic strength and versatility, serve as indispensable components in a wide array of applications, from electric vehicles to wind turbines. However, one crucial factor that influences their performance is their working temperature range. In this article, as one of the most professional NdFeB magnets manufacturers, we will delve into the intricacies of the working temperature of sintered NdFeB magnets and its implications across various industries.


The Temperature Sensitivity of NdFeB Magnets

Sintered NdFeB magnets exhibit temperature sensitivity due to their composition and micro-structure. As the temperature changes, the magnetic properties of these magnets can be significantly affected, impacting their performance in different environments.


Curie Temperature: A Critical Threshold

At the heart of understanding the working temperature of NdFeB magnets lies the concept of the Curie temperature. The Curie temperature is the point at which a material loses its magnetic properties when heated. For sintered NdFeB magnets, the Curie temperature typically ranges from 310°C to 400°C, depending on the grade of the magnet.


Effects of Temperature on Magnetic Properties

Below the Curie temperature, NdFeB magnets exhibit strong magnetic properties, providing high levels of magnetic flux density and coercivity. However, as the temperature increases beyond this threshold, the magnets experience a decrease in magnetic strength and coercivity. This phenomenon, known as thermal demagnetization, can compromise the performance of NdFeB magnets in high-temperature environments.


Working Temperature Range of Sintered NdFeB Magnets

The working temperature range of sintered NdFeB magnets varies depending on the specific application and the grade of the magnet. Generally, NdFeB magnets are classified into different grades based on their maximum operating temperature. Common grades include N35, N42, N52, and higher temperature grades such as N42SH and N52EH. These grades are designed to withstand different temperature ranges while maintaining their magnetic properties.


Applications and Considerations of Sintered NdFeB Magnets

The working temperature of sintered NdFeB magnets plays a crucial role in determining their suitability for various applications:


1. Electric Motors and Generators: NdFeB magnets are widely used in electric motors and generators, where they must withstand elevated temperatures during operation. Choosing the appropriate grade of magnet ensures optimal performance and longevity in these applications.

2. Industrial Machinery: NdFeB magnets find applications in industrial machinery such as magnetic separators and lifting systems. Understanding the working temperature range is essential for selecting magnets that can withstand the operating conditions of these environments.

3. Electronics and Sensors: In electronic devices and sensors, NdFeB magnets may be exposed to temperature fluctuations. Selecting magnets with the appropriate temperature rating ensures consistent performance and reliability in these applications.



The working temperature of sintered NdFeB magnets is a critical consideration in the design and implementation of magnetic systems across various industries. By understanding the temperature sensitivity of these magnets and selecting the appropriate grade for specific applications, engineers and manufacturers can optimize performance, reliability, and durability in diverse environments. As technology advances and new applications emerge, continued research and innovation in the field of NdFeB magnet materials will further expand their potential in high-temperature environments.