The feature of sintered NdFeB magnets
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NdFeB permanent materials are based on the inter-metallic Nd2Fe14B which has a vital high BH and Hcj. The advantages of high energy density makes NdFeB permanent magnetic material widely used in the modern industry and electronic applications, which makes instruments, generators, magnetic separators etc smaller, lower weight, thinner.
The advantages of NdFeB are that the cost performance is very high and have good mechanical properties while the disadvantages are that the curie temperature are too low, temperature feature is not good. We have to change its chemical composition and do surface treatment to promote its characters and to achieve actual applications.The process of sintered NdFeB magnets is powder metallurgy, the smelted alloy powders are pressed into mould in the magnetic fields, the compression moulding are sintered into densified products. We usually do thermal effect processing in order to promote the Hcj of the magnets.
