	US 12,305,265 B2
	Fine grain rare earth alloy cast strip, preparation method thereof, and a rotary cooling roll device
Wei Zhu, Beijing (CN); E Niu, Beijing (CN); Zhian Chen, Beijing (CN); Xuanzhang Ye, Beijing (CN); Fei Du, Beijing (CN); Zhan Wang, Beijing (CN); Xiaolei Rao, Beijing (CN); and Boping Hu, Beijing (CN)
Assigned to BEIJING ZHONG KE SAN HUAN HI-TECH CO., LTD., Beijing (CN)
Filed by BEIJING ZHONG KE SAN HUAN HI-TECH CO., LTD., Beijing (CN)
Filed on Apr. 29, 2022, as Appl. No. 17/733,879.
Application 17/733,879 is a continuation of application No. 16/455,653, filed on Jun. 27, 2019, abandoned.
Application 16/455,653 is a continuation of application No. PCT/CN2017/111025, filed on Nov. 15, 2017.
Claims priority of application No. 201611244386.6 (CN), filed on Dec. 29, 2016; application No. 201611244721.2 (CN), filed on Dec. 29, 2016; and application No. 201611245318.1 (CN), filed on Dec. 29, 2016.
Prior Publication US 2022/0251692 A1, Aug. 11, 2022
Int. Cl. H01F 1/053 (2006.01); B22D 11/06 (2006.01); C22C 38/00 (2006.01); C22C 38/32 (2006.01); B22D 11/00 (2006.01); B22D 11/124 (2006.01); B22D 11/128 (2006.01); B22D 11/14 (2006.01)

CPC C22C 38/005 (2013.01) [B22D 11/06 (2013.01); C22C 38/00 (2013.01); C22C 38/32 (2013.01); H01F 1/053 (2013.01); B22D 11/001 (2013.01); B22D 11/068 (2013.01); B22D 11/124 (2013.01); B22D 11/1287 (2013.01); B22D 11/144 (2013.01)]

3 Claims

1. An alloy cast strip preparation method comprising:

performing a melting process including:

placing rust-removed alloy raw material in a crucible placed in an induction melting furnace;

excluding impurity gas adsorbed by the alloy raw material;

controlling a power of the induction melting furnace to perform a cyclic heat treatment to completely melt the alloy raw material before a surface temperature of a melt obtained by melting the alloy raw material is raised to 1300° C.;

after the alloy raw material is melted, adjusting the power of the induction melting furnace to stabilize the surface temperature of the melt at a temperature in a range from 1400° C. to 1500° C.; and

performing a casting cooling process including:

arranging the melt uniformly and smoothly on a surface of a rotary cooling roll; and

performing casting cooling on the melt to obtain an alloy cast strip, while controlling a surface linear velocity of the rotary cooling roll to be from 1.5 m/s to 2.25 m/s;

wherein:

main components of the alloy cast strip include a rare earth R, an additive element T, iron Fe, and boron B;

R is one or more of La, Ce, Pr, Nd, Sm, Tb, Dy, Ho, Sc, and Y;

T is one or more of Co, Ni, Cu, Mn, Cr, Ga, V, Ti, Al, Zr, Nb, and Sn; and

a mass ratio of R in the alloy cast strip is in a range from 29% to 35%, a mass ratio of T in the alloy cast strip is smaller than or equal to 5%, and a mass ratio of B in the alloy cast strip is in a range from 0.85% to 1.1%.