Neodymium-iron-boron magnet material, raw material composition preparation method, and application

A neodymium-iron-boron magnet material, which comprises the following components by mass percentage:

• R:
• 28-33%;
• R comprises R1 and R2, R1 comprises Nd and Dy, R2 comprises Tb, the content of R2 is 0.2%-1%;
• the content of Dy in R1 is 0.05-0.3%;
• Co:
• 0.05-0.45%;
• M:
• ≤0.4%, but not 0, M is at least one element selected from group consisting of Bi, Sn, Zn, Ga, In, Au, and Pb;
• Cu:
• ≤0.15%, but not 0;
• B:
• 0.9-1.1%;
• Fe:
• 60-70%;
• C;
• and
• O;
• the percentage is the mass percentage of the mass of each component to the total mass of neodymium-iron-boron magnet material;
• the neodymium-iron-boron magnet material comprises Nd2Fe14B grains and their shells, and two-grain intergranular boundary and grain boundary triangle region adjoining to the Nd2Fe14B grains;
• wherein, heavy rare earth elements in R1 are distributed in Nd2Fe14B grains, R2 is mainly distributed in the shell, two-grain intergranular boundary and grain boundary triangle region, the area proportion of the grain boundary triangle region is 1.9-3.15%;
• the continuity of the two-grain intergranular boundary is 96% or more;
• the proportion of the mass of C and O in the grain boundary triangle region is 0.4-0.5%, the proportion of the mass of C and O in the two-grain intergranular boundary is 0.3-0.45%;
• wherein, the continuity of two-grain intergranular boundary refers to the ratio of the length of a B rich phase, a rare earth rich phase, rare earth oxides and rare earth carbides in the grain boundary to the total length of the grain boundary;
• the two-grain intergranular boundary further comprises a new phase with the chemical composition of Rx(Fe+Co)100-x-y-zCuyMz;
• wherein, R in the Rx(Fe+Co)100-x-y-zCuyMz comprises at least one element selected from Nd, Dy, and Tb;
• M is at least one element selected from Bi, Sn, Zn, Ga, In, Au, and Pb;
• x is 42-44;
• y is 0.2-0.4;
• z is 0.2-0.45.