4 ms·
How is this special? I used to work at a company that makes pumps with magnetic bearings. To pump hot liquids, we needed special magnets with higher Curie temp
by donquichotte 9y ago
How is this special?
I used to work at a company that makes pumps with magnetic bearings. To pump hot liquids, we needed special magnets with higher Curie temperatures than traditional Neodymium magnets. Our high-temperature products had Samarium-Cobalt magnets and ran, if memory serves, up to almost 200°C.
- aidenn0 9y agoHow did coercivity compare to traditional Nd magnets?
- dogma1138 9y agoCerium and Lanthanum (metal) costs about 10 times less than Samarium or Neodymium.
- philipkglass 9y agoThere's a pretty good overview here: https://supermagnetman.com/blogs/news/understanding-magnet-grades-and-magnet-tables https://supermagnetman.com/blogs/news/understanding-magnet-g... Neodymium-iron-boron magnets can have a higher energy product than samarium-cobalt, but require additions of expensive/rare heavy rare earth elements to work well at elevated temperatures. (Or require special microstructure modifications like Toyota has developed.) SmCo magnets have had good high temperature performance from the beginning, but a lower energy product. Other issues that discourage widespread substitution of SmCo magnets for NIB: - Samarium is significantly rarer than neodymium in economically exploitable rare earth resources (see table 1 here: https://pubs.usgs.gov/of/2013/1072/OFR2013-1072.pdf https://pubs.usgs.gov/of/2013/1072/OFR2013-1072.pdf) - The iron-boron balance of a neodymium-iron-boron magnet is cheap, whereas the cobalt in a SmCo magnet is relatively expensive.