Title:
FINE GRAIN RARE EARTH ALLOY CASTING PIECE, PREPARATION METHOD, AND ROTARY COOLING ROLLER DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/121112
Kind Code:
A1
Abstract:
Disclosed are a fine grain rare earth alloy casting piece, a preparation method and a rotary cooling roller device. The alloy casting piece has a roller-contacting surface and a free surface, and comprises grains with an R2Fe14B compound as the main phase, on the cross section along the temperature gradient, with the grains comprising non-columnar grains and columnar grains, wherein the proportion of the non-columnar grains with an aspect ratio of 0.3-2 with respect to the area percentage of the grains is ≥60%, and with respect to the number percentage of the grains is ≥75%; the proportion of the columnar grains with an aspect ratio ≥3 with respect to the area percentage of the grains is ≤15％, and with respect to the number percentage of the grains is ≤10%; and the alloy casting piece comprises a main phase of the R2Fe14B type, an in-grain rare earth-enriched phase embedded within the grains, and a boundary rare earth-enriched phase distributed on the boundary of the grains, wherein the spacing of the in-grain rare earth-enriched phases is 0.5-3.5 μm. The particle size of the powder obtained from the chemical crushing and mechanical crushing of the prepared alloy casting piece is more uniform, the adhesion rate of the rare earth-enriched phase is higher, and the coercive force of a magnet is improved.
Inventors:
ZHU WEI (CN)
NIU E (CN)
CHEN ZHIAN (CN)
YE XUANZHANG (CN)
DU FEI (CN)
WANG ZHAN (CN)
RAO XIAOLEI (CN)
HU BOPING (CN)
NIU E (CN)
CHEN ZHIAN (CN)
YE XUANZHANG (CN)
DU FEI (CN)
WANG ZHAN (CN)
RAO XIAOLEI (CN)
HU BOPING (CN)
Application Number:
PCT/CN2017/111025
Publication Date:
July 05, 2018
Filing Date:
November 15, 2017
Export Citation:
Assignee:
BEIJING ZHONG KE SAN HUAN (CN)
International Classes:
B22D11/06; H01F1/053
Domestic Patent References:
| WO2005098878A2 | 2005-10-20 |
Foreign References:
| CN103890867A | 2014-06-25 | |||
| CN1552543A | 2004-12-08 | |||
| CN102693799A | 2012-09-26 | |||
| CN102699294A | 2012-10-03 | |||
| CN105845301A | 2016-08-10 |
Attorney, Agent or Firm:
BEIJING LAWSING IP FIRM (CN)
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