Neodymium And Ferrite Magnets Manufacturer & Supplier 
NdFeB magnetism is very powerful, but they have an obvious disadvantage is not resistant to high temperature, more than or close to its maximum operating temperature when the magnetism will decline, to solve the problem of the stability of NdFeB magnets in high temperature environment, you can refer to the following methods.
The first can be used to control the use of the environment, to ensure that the working environment temperature of the neodymium iron boron magnet does not exceed its maximum operating temperature critical point. Environmental humidity is also an important factor affecting its stability. The environment should be kept as dry as possible to prolong the life of the magnet.
The accompanying picture shows tiny small neodymium magnets that can be slotted, chamfered and plated for different types of looks.
Materials with the same magnetic energy product but higher coercivity are chosen to enhance the magnet's stability at high temperatures. If possible, sacrificing a portion of the magnetic energy product for higher coercivity is also a viable option, such as in the case of high-performance H-series or SH-series magnets. In some extreme cases, other types of magnets can be considered, such as samarium cobalt magnets, which offer better thermal stability.
Consider thermal management in the design, such as the use of heat sinks or cooling systems.
There is also the possibility of encapsulating the magnet or wrapping it in insulating material to minimize the chance of heat coming into direct contact with the magnet.
The above method is more recommended is to change to high temperature performance grade, although in the price will be more expensive, but wins in the reliable, stable, which is enough.
In practice, it is often necessary to combine a number of these methods to achieve the best results. If you have a specific project or application scenario, please provide more detailed information so that more specific advice can be given.
Worth browsing;
2 Types of Ultra-High Temperature Magnets