No abstract

Uniformly ground Sm2Fe17N x fine powders with high-performance permanent magnetic property and oxidation resistance characteristics were obtained from the coarse powders by ball milling in an organic solution containing a surfactant and surface modification for them, followed by fabrication of their bonded magnets. Their remanence (B r) and coercivity (H cj) values were well-balanced and considerably higher than those for the samples prepared by conventional methods, and a huge maximum energy product (BH)max around 330 kJ m-3 was consequently attained as a reproducible average. The Sm2Fe17N x powder stabilized by surface coating with the zinc metal produced via photodecomposition of diethylzinc (Zn(C2H5)2) showed the better oxidation resistivity than the uncoated samples, so that the B r, H cj, and (BH)max values were maintained at high levels even after the heat treatment at 353−423 K for several hours as required to cure epoxy resin bonded magnets. The bonded magnets prepared from the Zn/Sm2Fe17N x powders provided the highest (BH)max value (∼176 kJ m-3) among the values reported up to date, even after exposure to air, and their irreversible flux loss was also smaller than that of the uncoated one.

Three types of triazolium cetyl-PEG10 sulfate ionic liquid were synthesized and their activation of Burkholderia cepacia lipase was investigated.

No abstract