Dalian University of Technology

Yanhui Li

Wei Zhang

Yingmin Wang

Dianguo Ma

Leiqiang Lai

Boron-based amorphous alloys and a preparation method thereof is provided. The composition formula of the alloys is BCoREX1X2X3, wherein RE is any one or more of La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Y; X1 is any one or more of C, Si and Al; X2 is any one or two of Fe and Ni; X3 is any one or more of Zr, Nb, Mo, Hf, Ta and W; and a, b, c, d, e and f respectively represent atomic percent of each corresponding element in the formula, where: 45&#x2264;a&#x2264;55, 25&#x2264;b&#x2264;40, 10&#x2264;c&#x2264;20, 0&#x2264;d&#x2264;10, 45&#x2264;a+d&#x2264;55, 0&#x2264;e&#x2264;20, 25&#x2264;b+e&#x2264;40, 0&#x2264;f&#x2264;3, 10&#x2264;c+f&#x2264;20 and a+b+c+d+e+f=100. The preparation method of the boron-based amorphous alloy comprises: preparing master alloy ingots using an arc furnace or an induction melting furnace; and then obtaining amorphous ribbons with different thicknesses by a single copper roller melt-spinning equipment.

Boron-based amorphous alloys and preparation method thereof

A kind of nano-porous Fe&#x2014;Pt alloys with strong permanent magnetism and a preparation method therefor. The nano-porous Fe&#x2014;Pt alloys have the composition of FeCoPtPdand are composed of an ordered hard magnetic L1-FePt phase, and have an integrated doubly-connected nano-porous structure with pore sizes of 10-50 nm, and ligament thicknesses of 20-80 nm. Under an applied magnetic field of 50 kOe, the coercivity, magnetization intensity and remanence of the alloys are 13.4-18.5 kOe, 40.4-56.3 emu/g and 28.3-37.4 emu/g, respectively. The master alloy ingots are prepared using electric arc melting or induction melting; the alloy ribbons are prepared using the single-roller melt-spinning equipment; the precursors mainly containing nano-composite phases of hard magnetic L1-FePt and soft magnetic FeB are obtained directly by the melt-spinning or obtained by conducting vacuum annealing on the melt-spun ribbons; and the nano-porous Fe&#x2014;Pt alloys with a single L1-FePt phase are obtained by the electrochemical dealloying technique, thereby filling in the technical blank of nano-porous metal materials with permanent magnetism.

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Liaoning, China

Yanhui Li