Abstract: The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. The neodymium-iron-boron magnet comprises a main phase crystal grain, a shell layer of the main phase crystal grain and a Nd-rich phase adjacent to the main phase crystal grain, wherein the main phase crystal grain comprises Nd2Fe14B; or the main phase crystal grain comprises Nd2Fe14B and Pr2Fe14B; the shell layer comprises (Nd/Dy)2Fe14B and/or (Nd/Tb)2Fe14B; the shell layer has a thickness of 0.1-6 ?m; the Nd-rich phase comprises a R6Fe13B phase, wherein the R is one or more selected from the group consisting of Nd, Pr, Dy and Tb. The method of the invention effectively reduces the diffusion amount of the heavy rare earth elements into the main phase, forms a thinner heavy rare earth shell layer, and can further optimize and improve the high temperature performance of the magnet.

Abstract: A main and auxiliary alloy-based neodymium-iron-boron magnet material and the preparation method thereof. The raw material composition for the main and auxiliary alloy-based neodymium-iron-boron magnet material includes a main alloy raw material and an auxiliary alloy raw material, wherein the mass percentage of the auxiliary alloy raw material in the raw material composition for the main and auxiliary alloy-based neodymium-iron-boron magnet material is 1.0-15.0 mass %. For the main and auxiliary alloy-based neodymium-iron-boron magnet material prepared by using the raw material composition, the coercivity is increased while high remanence is ensured, and the preparation method therefor can be suitable for engineering applications.

Abstract: The invention discloses an R-T-B magnet and a preparation method thereof. The R-T-B magnet comprises the following components of: ?30.0 wt % of R, wherein R is a rare earth element; 0.1-0.3 wt % of Nb; 0.955-1.2 wt % of B; 58-69 wt % of Fe, wherein wt % is a percentage of the mass of respective component to the total mass of all components; the R-T-B magnet further comprises Co and Ti; and in the R-T-B magnet, the ratio of the mass content of Co to the total mass content of “the Nb and the Ti” is 4-10. The present invention further optimizes the coordination relationship among the components in the R-T-B magnet, which can prepare a magnet material with relatively high levels of magnetic properties such as remanence, coercivity, squareness and the like.

Abstract: An RIB-based permanent magnet material, a preparation method thereof, and an application thereof. The RIB-based permanent magnet material comprises the following components: R?: 29.5 to 33.5 wt. %, wherein R? comprises Pr, and the content of Pr is ?8.85 wt. %; C:0.106 to 0.26 wt. %; O: ?0.07 wt. %; X: 0 to 5.0 wt. %, wherein X is one or more of Cu, Al, Ga, Co, Zr, Ti, Nb and Mn; B:0.90 to 1.2 wt. %; and Fe:61.4 to 69.5 wt. %. The RIB-based permanent magnet material can improve the performance of a permanent magnet material without employing heavy rare earths. There is no need to control the content of carbon introduced in the process, and the magnet exhibits excellent performance even with a high carbon content.

Abstract: An R-T-B series permanent magnet material, a raw material composition, a preparation method, and an application. An R-T-B series permanent magnet material I comprises R, T and X, which satisfy the following relational formula: (1) the atomic ratio of (Fe+Co)/B is 12.5-13.5; (2) the atomic ratio of B/X is 2.7-4.1; and X is one or more among Al, Ga and Cu. The permanent magnet material I comprises R2T14B primary phase crystalline particles, and a secondary grain boundary phase and a rare earth rich phase between two adjacent R2T14B primary phase crystalline particles. The secondary grain boundary phase and rare earth rich phase comprise phases composed of R6T13X. R6T13X phases are formed in the R-T-B series permanent magnet material I, so that Hcj and mechanical performance can be synchronously improved.

Abstract: Disclosed are an R-T-B-based permanent magnet material, a preparation method therefor and the use thereof. The R-T-B-based permanent magnet material I comprises the following components: 29.0-32.5% of R including RH, 0.30 to 0.50 wt. % of Cu, 0.05 to 0.20 wt. % of Ti, 0.85 to 1.05 wt. % of B, 0.1 to 0.3 wt. % of C, 66 to 68 wt. % of Fe, wherein R is a rare earth element and R at least includes Nd; and RH is a heavy rare earth element and RH at least includes Tb or Dy, A Cu—Ti—C grain boundary phase is formed in the R-T-B-based permanent magnet material I, and Hcj is significantly improved.