Neodymium-iron-boron magnetic material, preparation method therefor and application thereof
View Patent ↗A neodymium-iron-boron magnetic material, a preparation method therefor and an application thereof. The neodymium-iron-boron magnetic material comprises the following components in percentage by mass: 29.5-31.5 wt. % of R, where RH>1.5 wt. %; 0.05-0.25 wt. % of Cu; 0.42-2.6 wt. % of Co; 0.20-0.3 wt. % of Ga; 0.25-0.3 wt. % of N; 0.46-0.6 wt. % of Al, or alternatively Al is less than or equal to 0.04 wt. % but is not 0; 0.98-1 wt. % of B; and 64-68 wt. % of Fe; wherein R is a rare-earth element and comprises Nd and RH, RH is a heavy rare-earth element and comprises Tb, and a mass ratio of Tb to Co is less than or equal to 15 but is not 0. The neodymium-iron-boron magnetic material has higher Hcj and Br, and lower absolute values of temperature coefficients of Br and Hcj.
1 . A neodymium-iron-boron magnetic material, consisting of, by mass percentage, the following components: 29.5-31.5 wt. % of R, with RH>1.5 wt. %,
0.05-0.25 wt. % of Cu,
0.42-2.6 wt. % of Co,
0.25-0.3 wt. % of Ga,
0.26-0.3 wt. % of Zr,
0.46-0.6 wt. % of Al or Al≤0.04 wt. %, exclusive of 0 wt. %,
0.98-1 wt. % of B,
64-68 wt. % of Fe,
wherein R is a rare earth element and consists of a light rare earth element and RH,
wherein the light rare earth element consists of only Nd, or
Nd and Pr,
wherein RH is Tb;
the mass ratio of Tb to Co is less than or equal to 15, exclusive of 0.
2 . The neodymium-iron-boron magnetic material according to claim 1 , wherein the neodymium-iron-boron magnetic material consists of, by mass percentage, the following components: 27-27.44 wt. % of Nd, 2.8-4 wt. % of Tb, 0.05-0.16 wt. % of Cu, 1.48-2.6 wt. % of Co, 0.25-0.26 wt. % of Ga, 0.26-0.3 wt. % of Zr, 0.46-0.5 wt. % or 0.02-0.04 wt. % of Al, 0.98-0.99 wt. % of B, and 64-66 wt. % of Fe, with the percentage referring to the mass percentage relative to the neodymium-iron-boron magnetic material; and the mass ratio of Tb to Co is (1-15):1.
3 . The neodymium-iron-boron magnetic material according to claim 1 , wherein the neodymium-iron-boron magnetic material consists of, by mass percentage, the following components: 27-27.44 wt. % of Nd, 2.9-3.4 wt. % of Tb, 0.05-0.16 wt. % of Cu, 1.48-2.6 wt. % of Co, 0.25-0.26 wt. % of Ga, 0.26-0.3 wt. % of Zr, 0.46-0.5 wt. % or 0.02-0.04 wt. % of Al, 0.98-0.99 wt. % of B, and 64-66 wt. % of Fe, with the percentage referring to the mass percentage relative to the neodymium-iron-boron magnetic material; the mass ratio of Tb to Co is (1-3):1.
4 . A neodymium-iron-boron magnetic material, consisting of, by mass percentage, the following components: 29.5-31.5 wt. % of R, with RH>1.5 wt. %,
0.05-0.25 wt. % of Cu,
0.42-2.6 wt. % of Co,
0.25-0.3 wt. % of Ga,
0.26-0.3 wt. % of Zr,
0.46-0.6 wt. % of Al or Al≤0.04 wt. %, exclusive of 0 wt. %,
0.98-1 wt. % of B,
64-68 wt. % of Fe,
≤0.035 wt. % of Mn, exclusive of 0 wt. %,
wherein R is a rare earth element and consists of a light rare earth element and RH,
wherein the light rare earth element consists of only
Nd, or
Nd and Pr,
wherein RH is Tb;
the mass ratio of Tb to Co is less than or equal to 15, exclusive of 0.
5 . The neodymium-iron-boron magnetic material according to claim 4 , wherein the neodymium-iron-boron magnetic material consists of, by mass percentage, the following components: 27-27.44 wt. % of Nd, 2.8-4 wt. % of Tb, 0.05-0.16 wt. % of Cu, 1.48-2.6 wt. % of Co, 0.25-0.26 wt. % of Ga, 0.26-0.3 wt. % of Zr, 0.46-0.5 wt. % or 0.02-0.04 wt. % of Al, 0.98-0.99 wt. % of B, 64-66 wt. % of Fe, and 0.01-0.035 wt. % of Mn, with the percentage referring to the mass percentage relative to the neodymium-iron-boron magnetic material; and the mass ratio of Tb to Co is (1-15):1.
6 . The neodymium-iron-boron magnetic material according to claim 4 , wherein the neodymium-iron-boron magnetic material consists of, by mass percentage, the following components: 27-27.44 wt. % of Nd, 2.9-3.4 wt. % of Tb, 0.05-0.16 wt. % of Cu, 1.48-2.6 wt. % of Co, 0.25-0.26 wt. % of Ga, 0.26-0.3 wt. % of Zr, 0.46-0.5 wt. % or 0.02-0.04 wt. % of Al, 0.98-0.99 wt. % of B, 64-66 wt. % of Fe, and 0.01-0.035 wt. % of Mn, with the percentage referring to the mass percentage relative to the neodymium-iron-boron magnetic material; and the mass ratio of Tb to Co is (1-3):1.