公开(公告)号：US20180114615A1

公开(公告)日：2018-04-26

申请号：US15572707

申请日：2016-05-13

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Wei ZHANG ,  Yingmin WANG ,  Yanhui LI ,  Dianguo MA

IPC: H01F1/047 ,  C22C1/08 ,  C22C5/04 ,  C22C38/00 ,  C22C38/10 ,  B82Y30/00 ,  B82Y40/00

CPC classification number: H01F1/047 ,  B22F2999/00 ,  B82Y30/00 ,  B82Y40/00 ,  C22C1/08 ,  C22C5/04 ,  C22C38/002 ,  C22C38/10 ,  C22C2202/02 ,  H01F10/123 ,  H01F41/0253 ,  C22C1/05

Abstract: A kind of nano-porous Fe—Pt alloys with strong permanent magnetism and a preparation method therefor. The nano-porous Fe—Pt alloys have the composition of FewCoxPtyPdz and are composed of an ordered hard magnetic L10-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 L10-FePt and soft magnetic Fe2B are obtained directly by the melt-spinning or obtained by conducting vacuum annealing on the melt-spun ribbons; and the nano-porous Fe—Pt alloys with a single L10-FePt phase are obtained by the electrochemical dealloying technique, thereby filling in the technical blank of nano-porous metal materials with permanent magnetism.