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I am very curious how they create grains of the cerium and then coat them with neodymium to then fuse them together. I theorize that they first alloy the cerium
by Hextinium 9y ago
I am very curious how they create grains of the cerium and then coat them with neodymium to then fuse them together.
I theorize that they first alloy the cerium and lanthanum together and then grind it to a correct particle size. Then they negatively electrically charge the rare earth particles and bond neodymium to it with vapor deposition but I don't know it that is possible at that scale.
They would then press the particles together and heat them up so that they fuse but don't liquify.
All of this looks very very cool I just have no concept for how it would actually happen.
- Hextinium 9y agoNever mind, I just found the answer to my own question but I find it interesting none the less. So as the solution of the three metals cool if done correctly the neodymium will come out of solution to form a mesh of neodymium around the grains of cerium and lanthanum in a similar way that pearlite forms from austinite and ferrite in steel. This will give them a "sponge" of neodymium to conduct the magnetic field but have the cerium and lanthanum act as filler. To explain what I am talking about way better than I ever could, this video is how heat treating steel will change it's properties and why different steels act the way they do. https://youtu.be/6jQ4y0LK1kY https://youtu.be/6jQ4y0LK1kY
- neltnerb 9y agoIf memory serves, in standard Nd-B-Fe magnets the neodymium also concentrates at the grain boundary in the same way. My guess is that the Ce/La is acting as a stabilizer for the internal structure replacing Nd that would otherwise have been stuck inside the crystallite.
- deleted 9y ago[deleted]
- blueprint 9y ago> theorize You mean hypothesize