Cryogenic valve actuator

Ruppert, U.; Szűcs, Zoltán; Arend, Ingrid; Schoele, M.

doi:10.1016/0011-2275(90)90087-s

Cited by 2 publications

(1 citation statement)

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“…Another issue associated with NdÀFeÀB magnets is their unsuitability in cryogenic environments, such as certain space applications where the temperature may be~100 K. [12,13] This issue is due to spin reorientation arising from the interplay between the magneto-crystalline anisotropies of the different magnetically ordered sub-lattices. The easy axis of magnetization changes at the spin reorientation temperature (T SR ).…”

Section: Introductionmentioning

confidence: 99%

Mechanochemically Processed Nd−Fe−Co−Cr−B Nanoparticles with High Coercivity and Reduced Spin Reorientation Transition Temperature

et al. 2018

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Nd-Fe-B magnets, possessing the highest energy product, are extensively used in cutting-edge applications, including electrical machines and electrical vehicles. An environmentally benign and cost effective synthesis method of Cr alloyed Nd (Fe,Co) B magnetic nanoparticles using a dry mechanochemical process is reported. The method is solvent free, facile, energy efficient and scalable. The reduction of mixed oxides of Nd, Fe, Co, B and Cr is performed by using Ca. The coercivity (H ) of the nanoparticles is found to depend on the dispersant content, with the highest value obtained for Nd (Fe Co Cr )B with 40 % CaO dispersant. The H of isolated Nd (Fe Co Cr )B nanoparticles and nanoparticles embedded in a CaO matrix is found to be 11.5 kOe and 14.4 kOe, respectively, largest values for heavy rare earth free Nd-Fe-B nanoparticles with reasonable saturation and remanent magnetization, regardless of synthesis route. Considering the density of Nd Fe B, an energy product of 14.2 MGOe is obtained for the nanoparticles. The thermal coefficient of remanence and thermal coefficient of coercivity for aligned samples are -0.06 % and -0.29 %, respectively, in the temperature range between 100 K and 400 K. The spin reorientation temperature is found to be ∼30 K less than that of bulk Nd Fe B magnets.

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Section: Introductionmentioning

confidence: 99%