Publication number: 20180090250
Abstract: An R—Fe—B base sintered magnet is provided comprising a main phase containing an HR rich phase of (R?, HR)2(Fe,(Co))14B wherein R? is an element selected from yttrium and rare earth elements exclusive of Dy, Tb and Ho, and essentially contains Nd, and HR is an element selected from Dy, Tb and Ho, and a grain boundary phase containing a (R?, HR)—Fe(Co)-M1 phase in the form of an amorphous phase and/or nanocrystalline phase, the (R?, HR)—Fe(Co)-M1 phase consisting essentially of 25-35 at % of (R?, HR), 2-8 at % of M1 which is at least one element selected from Si, Al, Mn, Ni, Cu, Zn, Ga, Ge, Pd, Ag, Cd, In, Sn, Sb, Pt, Au, Hg, Pb, and Bi, up to 8 at % of Co, and the balance of Fe. The HR rich phase has a higher HR content than the HR content of the main phase at its center. The magnet produces a high coercivity despite a low content of Dy, Tb and Ho.
Type:
Application
Filed:
September 25, 2017
Publication date:
March 29, 2018
Applicant:
SHIN-ETSU CHEMICAL CO., LTD.
Inventors:
Tetsuya Ohashi, Tetsuya Kume, Koichi Hirota, Hajime Nakamura
Publication number: 20170098503
Abstract: A rare earth sintered magnet is an anisotropic sintered body comprising Nd2Fe14 B crystal phase as primary phase and having the composition R1aTbMcSidBe wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, M is Al, Cu, Zn, In, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, “a” to “e” are 12?a?17, 0?c?10, 0.3?d?7, 5?e?10, and the balance of b, wherein Dy and/or Tb is diffused into the sintered body from its surface.
Type:
Application
Filed:
December 12, 2016
Publication date:
April 6, 2017
Applicant:
SHIN-ETSU CHEMICAL CO., LTD.
Inventors:
Hiroaki Nagata, Yuuji Gouki, Kazuaki Sakaki, Tadao Nomura, Koichi Hirota, Hajime Nakamura