Comparison of differences between samarium cobalt magnet and NdFeb magnet:
First, magnetic: NdFeb is strong, known as the "magnetic king" of Ndfeb magnets in the industry, and the magnetic property of samarium cobalt magnet is second to NdFeb.
Two, temperature resistance: NdFeb higher 220 degrees material can reach more than 28AH, samarium cobalt magnet higher 350 degrees need to Sm2Co17 material to reach.
Three, stability: Ndfeb remanence temperature coefficient is large, with the increase of temperature, the degree of remanence decreases; The remanence temperature coefficient of samarium cobalt magnet is small, and the degree of remanence decreases with the increase of temperature. The demagnetization rate is small. In addition, Ndfeb must be plated, otherwise it is easy to be oxidized corrosion, weathering away. Generally, cobalt coating does not need electroplating, but it has high requirements on the environment, long service life after electroplating, and beautiful.
Four, the price: Ndfeb rare earth elements neodymium, boron account for a small proportion, so the price is relatively cheap; Samarium cobalt magnet has a high proportion of rare earth elements samarium and cobalt, so the price is relatively expensive.
5. Appearance characteristics.
Cobalt coating generally does not need surface treatment, but when the environment is harsh, the service life is longer, and more beautiful, Ndfeb is easy to oxidation, surface plating treatment is needed.
Sixth, there is resistance.
The iron content of Ndfeb is very high, so it is easy to be oxidized corrosion, so to do electroplating treatment, the service life is very important, determines the coating effect! However, the ferrite in the samarium cobalt magnet only accounts for a small part of the content, which is basically rare earth and metal elements that are not easy to be oxidized and corroded. Generally, it does not need electroplating. However, the use of bad environment or to prolong the service life of its appearance to beautify, electroplating treatment will be better!
