R-t-b based permanent magnet material, preparation method therefor and use thereof
AssigneeYantai Zhenghai Magnetic Material Co., Ltd.
InventorsYongjiang YU, Meng LI, Yunying JIANG, Lei LIU, Tao REN
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Abstract
An R-T-B based permanent magnet material, a preparation method therefor and use thereof are provided. The R-T-B permanent magnet material forms M oxides at the grain boundary triple point, such that oxygen is enriched at the grain boundary triple point, thereby accurately controlling the oxygen content in the magnet. The permanent magnet material and the preparation method of the present disclosure can prepare products with strong corrosion resistance under the condition of unchanged magnetic properties, and improve the formability in the pressing process, thereby improving the qualified rate of the products.
Claims10
An R-T-B based permanent magnet material, wherein the R is selected from one, two, or more of neodymium (Nd), praseodymium (Pr), gadolinium (Gd), holmium (Ho), dysprosium (Dy), and terbium (Tb);
- the T comprises at least iron (Fe);
- the B is boron;
- the permanent magnet material further comprises M, wherein the M is selected from one or more of transition metal elements, low-melting-point metal elements, non-metal elements, and light rare earth elements;
- and
- an M oxide is present in a grain boundary phase of the permanent magnet material;
- preferably, the balance of the permanent magnet material is Fe, O, and an inevitable impurity;
- more preferably, the mass percentage of the O is 700 to 4000 ppm, based on the mass of the permanent magnet material.
A metal composition, wherein the composition comprises metals R, T, and B as matrices, and M oxides present in the matrices;
- preferably, the composition is present in the form of a powder;
- the particle size of the powder can be not more than 500 μm, for example, 1 μm to 300 μm, preferably 1 μm to 50 μm;
- preferably, the mass percentage of the M oxides is not less than 0.05% and not more than 5.00%, preferably not less than 0.10% and not more than 3.00%, based on the mass percentage of the matrices in the composition.
Dependencies are inferred from the claim text.