How To Choose Magnet Material?


  Choosing the right magnet material is a key part of t […]

  Choosing the right magnet material is a key part of the magnet assembly design, because it will greatly affect the performance of the final product. The following are some of the tips from our decades of design experience, which should be considered when selecting materials and grades for your components.


  Precautions for choosing magnet type


  When considering which magnet material to choose for design, ask the following key questions:


  How will the magnet be used?


  Where will it be used?


  What temperature range does it need to withstand?


  What does it need to hold?


  These questions will indicate the required cost, corrosion resistance, temperature performance and strength requirements. Different magnet materials will best meet different needs.


  Magnet materials: advantages and disadvantages


  Each magnet material has unique characteristics, which have specific advantages and disadvantages for a given application, as described below.


  mar cobalt: high heat, strong strength-to-weight ratio, high cost


  mar cobalt is very suitable for the high strength, corrosion resistance and high operating temperature required in many applications. However, this alloy is usually more expensive than other materials because it contains cobalt. For applications where performance requirements outweigh cost (such as aerospace or medical), the cost factor may not be high, which may be the case for consumers and other high-volume applications.


  Neodymium: high strength, medium cost


  Neodymium is a cheaper material than Sa cobalt because it is an alloy composed of neodymium, iron and boron. A powerful combination without cobalt.


  Although neodymium has lower cost and higher strength, it does not have the high heat resistance or corrosion resistance of Sa cobalt, so it may not be used in some applications.


  Alnico: low cost, high heat


  Alnico is a kind of aluminum nickel cobalt alloy. Compared with that of cobalt, the amount of cobalt used is less, so the price is cheaper. Due to its higher working temperature and corrosion resistance, it is the material of choice for high-calorie applications.


  The trade-off is that AlNiCo is not as strong as other magnet materials, so the magnet size required for proper performance will be larger. This generally eliminates AlNiCo alloy as a material for applications that require very small magnets in electronic devices, such as consumer electronics.


  Ceramics: low cost, corrosion resistant


  Ceramic magnets provide a low-cost solution with high corrosion resistance. However, these magnets are very brittle. Although ideal for low-cost, medium-performance applications, machining requires diamond tools and limits the final part to relatively simple geometries.

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