RTB magnet and its manufacturing method

Abstract

The present invention discloses an RTB magnet and a method for making the same. [Solution] The RTB magnet contains the following components: R: ≧30.0wt.%, R is a rare earth element, Cu: 0.16-0.6wt.%, Ti: 0.4-0.8wt.%, Ga: ≦0.2wt.%, B: 0.955-1.2wt.%, Fe: 58-69%, where wt.% is the mass percentage of each component relative to the total mass of each component. The RTB magnet of the present invention has high residual magnetic flux density, high coercive force and squareness ratio, and is stable at high temperatures.

Description

[Technical Field]

[0001] The present invention relates to an RTB magnet and a method for manufacturing the same. [Background technology]

[0002] Neodymium iron boron permanent magnet materials, as important rare earth functional materials, have excellent comprehensive magnetic properties and are widely used in many fields such as the electronics industry, electric vehicles, etc. However, currently, the poor temperature stability of neodymium iron boron magnet materials limits their application in high temperature ranges.

[0003] For example, Chinese patent document CN102412044A discloses a neodymium-iron-boron magnet material containing 23-30% Nd, 0.5-8% Dy, 0.2-0.5% Ti, 2.5-4% Co, 0.2-3.8% Nb, 0.05-0.7% Cu, 0.01-0.9% Ga, and 0.6-1.8% B. This patent document only mentions that the combined addition of Ti, Ga, and Co significantly improves the corrosion resistance of the material, while Ga, instead of Dy, performs some functions in the material and reduces costs. However, this patent does not further discuss how this affects the performance of the magnet material. The examples disclose the mass percent contents of each component as follows: 28.3% Nb, 3.2% Dy, 0.3% Ti, 2.7% Co, 0.7% Nb, 0.4% Cu, 0.25% Ga, and 1.2% B. This magnetic material formulation does not fully utilize the improvements in magnetic properties that each element provides to a neodymium-iron-boron-based magnetic material, and it is not possible to obtain a magnetic material that combines good coercivity, residual magnetic flux density, and high-temperature stability.

[0004] Currently, there is a need to further optimize the formulation of neodymium iron boron magnet materials in the prior art in order to obtain magnet materials with better overall magnetic performance. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides an RTB magnet and a method for manufacturing the same to solve the problem in the prior art that magnets obtained from the components of neodymium iron boron magnet materials cannot simultaneously achieve high levels of remanence, coercivity, high-temperature stability, and squareness. By combining specific elements in the RTB magnet in this invention with specific contents, it is possible to produce a magnetic material with high remanence, coercivity, and squareness, as well as excellent high-temperature stability. [Means for solving the problem]

[0006] The present invention mainly solves the above technical problems through the following technical ideas.

[0007] The present invention provides an RTB magnet, comprising the following components: R: ≧30.0 wt.%, wherein R is a rare earth element; Cu: 0.16-0.6 wt.% Ti: 0.38~0.8wt.% Ga: ≦0.2 wt.%, B: 0.955-1.2 wt.% Fe: 58 to 69%, wt. % is the mass percentage of the mass of each component relative to the total mass of each component.

[0008] In the present invention, the content of R is preferably 30.5 wt.% or more, more preferably 30.5 to 32 wt.%, for example 30.6 wt.% or 32 wt.%.

[0009] In the present invention, R may generally further contain Nd.

[0010] Here, the Nd content is preferably 29 to 31 wt.%, for example, 28.6 wt.%, 29.6 wt.%, 29.8 wt.%, 30 wt.%, 30.2 wt.%, 30.4 wt.%, 30.6 wt.%, or 31 wt.%, where wt.% is the mass percentage of the total mass of each component.

[0011] In the present invention, the R may generally further include Pr and / or RH, and the RH is a heavy rare earth element.

[0012] Here, the Pr content is preferably 0.3 wt.% or less.

[0013] Here, the content of RH is preferably 2 wt.% or less, for example, 0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.%, 1 wt.%, or 2 wt.%, where wt.% is the mass percentage of each component relative to the total mass.

[0014] Here, the type of RH preferably includes Tb and / or Dy.

[0015] When R contains Tb, the content of Tb is preferably 1.4 wt.% or less, for example, 0.2 wt.%, 0.4 wt.%, 0.5 wt.%, 0.6 wt.%, 0.8 wt.%, or 1 wt.%, where wt.% is the mass percentage of each component relative to the total mass of the component.

[0016] When R contains Dy, the content of Dy is preferably 0.5 to 2 wt. %, where wt. % is the mass percentage relative to the total mass of each component.

[0017] Here, the ratio of the atomic percentage content of RH to the atomic percentage content of R may be 0.1 or less, for example, 0.02, 0.04, 0.05, 0.06, 0.07, 0.08, or 0.09, and the atomic percentage content means the atomic percentage of each component in the total content.

[0018] In the present invention, the Cu content is preferably 0.16 to 0.45 wt.%, for example 0.16 wt.%, 0.21 wt.%, 0.34 wt.%, or 0.45 wt.%, and more preferably 0.16 to 0.35 wt.%.

[0019] In the present invention, the Ti content is preferably 0.4 to 0.7 wt.%, for example 0.4 wt.%, 0.45 wt.%, 0.55 wt.%, 0.6 wt.%, or 0.7 wt.%, and more preferably 0.4 to 0.5 wt.%.

[0020] In the present invention, the Ga content is preferably 0.01 to 0.19 wt.%, for example 0.01 wt.%, 0.02 wt.%, 0.06 wt.%, or 0.19 wt.%, and more preferably 0.01 to 0.06 wt.%.

[0021] In the present invention, the content of B is preferably 0.96 to 1.15 wt.%, for example, 0.96 wt.%, 1 wt.%, 1.04 wt.%, or 1.15 wt.%.

[0022] In the present invention, the ratio of the atomic percentage content of B to the atomic percentage content of R in the RTB magnet may be 0.35 or more, for example, 0.401, 0.420, 0.436, 0.437, 0.438, 0.455 or 0.503, preferably 0.42 to 0.51, and the atomic percentage content means the atomic percentage of the total content of each component.

[0023] In the present invention, the Fe content is preferably 66 to 68 wt.%, for example, 66.3 wt.%, 66.66 wt.%, 66.68 wt.%, 67.09 wt.%, 67.43 wt.%, 67.5 wt.%, 67.54 wt.%, 67.57 wt.%, 67.58 wt.%, 67.64 wt.%, 67.67 wt.%, 67.68 wt.%, 67.7 wt.%, 67.75 wt.%, or 67.8 wt.%.

[0024] In the present invention, generally, the RTB magnet may further contain Al.

[0025] Here, the Al content is preferably 0.18 wt.% or less, for example, 0.02 wt.%, 0.04 wt.%, 0.05 wt.%, 0.06 wt.%, 0.07 wt.%, or 0.14 wt.%, preferably 0.02 to 0.08 wt.%, where wt.% is the mass percentage relative to the total mass of each component.

[0026] In the present invention, generally, the RTB magnet may further contain Co.

[0027] Here, the Co content is preferably 0.5 to 1.5 wt %, for example 1 wt %, where wt % is the mass percentage relative to the total mass of each component.

[0028] In the present invention, as known to those skilled in the art, the RTB magnet may further contain unavoidable impurities, such as C and / or O, during the manufacturing process.

[0029] The inventors have found that by optimizing the composition of RTB magnets, the magnetic properties such as coercivity, high temperature stability, and squareness ratio of the RTB magnets obtained by combining elements such as Cu, Ti, and Ga in the specific amounts are significantly improved. Further analysis has revealed that after producing an RTB magnet with the specific composition of the present invention, a specific area percentage of Ti in the RTB magnet is added. x Cu y B 1-x-y The present inventors have discovered that the formation of a phase significantly inhibits the growth of crystal grains, leading to more uniform sizes of main phase crystal grains in the magnet, thereby enabling the production of an RTB magnet with excellent overall magnetic properties.

[0030] In the present invention, the RTB magnet preferably contains Ti x Cu y B 1-x-y phase, wherein x is 20 to 30, y is 20 to 30, and 1-xy is 40 to 60, and x, y, and 1-xy are each the Ti x Cu y B 1-x-yThe Ti content in the Ti phase is expressed as a percentage of the Ti content in the Cu phase. x Cu y B 1-x-y The Ti phase is located in the intergranular triangular region. x Cu y B 1-x-y The ratio of the area of ​​the Ti phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 1 to 5%. x Cu y B 1-x-y The area of ​​the phase or the total area of ​​the "neodymium-rich phase and intergranular triangular regions" generally means the area occupied by each of the detected RTB cross sections when detected by FE-EPMA.

[0031] Here, the value of x is, for example, 21, 22, 23, 24, 25, or 27.

[0032] Here, the value of y is, for example, 21, 22, 23, 24, 25, 26, or 27.

[0033] Here, the value of 1-xy is, for example, 48, 49, 50, 51, 52, 53, 55, or 58.

[0034] Here, the Ti x Cu y B 1-x-y The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergrain triangular regions" is preferably 2.5 to 4%, for example, 2.9%, 3.2%, 3.4%, 3.5%, 3.6%, 3.7% or 3.9%.

[0035] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.68 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.68 wt.% Fe. 23 Cu 25 B 52phase, 23 Cu 25 B 52 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0036] In one specific embodiment of the present invention, the RTB magnet contains 29.8 wt.% Nd, 0.8 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.8 wt.% Nd, 0.8 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe. 23 Cu 24 B 53 phase, 23 Cu 24 B 53 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%.

[0037] In one specific embodiment of the present invention, the RTB magnet contains 30 wt.% Nd, 0.6 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.68 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 30 wt.% Nd, 0.6 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.68 wt.% Fe. 22 Cu 26 B 52 phase, 22 Cu 26 B 52 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.6%.

[0038] In one specific embodiment of the present invention, the RTB magnet contains 30.2 wt.% Nd, 0.4 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.08 wt.% Al, and 67.64 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 30.2 wt.% Nd, 0.4 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.08 wt.% Al, and 67.64 wt.% Fe. 25 Cu 25 B 50 phase, 25 Cu 25 B 50 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0039] In one specific embodiment of the present invention, the RTB magnet contains 30.4 wt.% Nd, 0.2 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.02 wt.% Al, and 67.7 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 30.4 wt.% Nd, 0.2 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.02 wt.% Al, and 67.7 wt.% Fe. 24 Cu 26 B 50 phase, 24 Cu 26 B 50 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0040] In one specific embodiment of the present invention, the RTB magnet contains 30.6 wt.% Nd, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the RTB magnet. 22 Cu 23 B 55 phase, 22 Cu 23 B 55The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.2%.

[0041] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 1 wt.% Co, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 66.68 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the RTB magnet. 26 Cu 25 B 49 phase, 26 Cu 25 B 49 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.6%.

[0042] In one specific embodiment of the present invention, the RTB magnet contains 30.6 wt.% Nd, 1 wt.% Co, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 66.66 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 30.6 wt.% Nd, 1 wt.% Co, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 66.66 wt.% Fe. 24 Cu 25 B 51 phase, 24 Cu 25 B 51 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.2%.

[0043] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.19 wt.% Ga, 0.05 wt.% Al, and 67.5 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.19 wt.% Ga, 0.05 wt.% Al, and 67.5 wt.% Fe. 23 Cu25 B 52 phase, 23 Cu 25 B 52 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 2.9%.

[0044] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.55 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.57 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.55 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.57 wt.% Fe. 27 Cu 25 B 48 phase, 27 Cu 25 B 48 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0045] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.7 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.43 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.7 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.43 wt.% Fe. 25 Cu 25 B 50 phase, 25 Cu 25 B 50 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%.

[0046] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.34 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.54 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.34 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.54 wt.% Fe. 24 Cu 24 B 52 phase, 24 Cu 24 B 52 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.7%.

[0047] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1.04 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.64 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1.04 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.64 wt.% Fe. 21 Cu 21 B 58 phase, 21 Cu 21 B 58 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.6%.

[0048] In one specific embodiment of the present invention, the RTB magnet contains 31 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 0.96 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 66.3 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the RTB magnet. 25 Cu 23 B 52 phase, 25 Cu 23 B 52The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.9%.

[0049] In one specific embodiment of the present invention, the RTB magnet contains 29.8 wt.% Nd, 0.8 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.14 wt.% Al, and 67.58 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the RTB magnet. 24 Cu 26 B 50 phase, 24 Cu 26 B 50 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%.

[0050] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.45 wt.% Cu, 0.6 wt.% Ti, 1.15 wt.% B, 0.06 wt.% Ga, 0.05 wt.% Al, and 67.09 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.45 wt.% Cu, 0.6 wt.% Ti, 1.15 wt.% B, 0.06 wt.% Ga, 0.05 wt.% Al, and 67.09 wt.% Fe. 27 Cu 23 B 50 phase, 27 Cu 23 B 50 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0051] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.16 wt.% Cu, 0.4 wt.% Ti, 0.96 wt.% B, 0.01 wt.% Ga, 0.07 wt.% Al, and 67.8 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the RTB magnet. 24 Cu25 B 51 phase, 24 Cu 25 B 51 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%.

[0052] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.4 wt.% Ti, 1 wt.% Ga, 0.04 wt.% Al, and 67.75 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.4 wt.% Ti, 1 wt.% Ga, 0.04 wt.% Al, and 67.75 wt.% Fe. 26 Cu 26 B 48 phase, 26 Cu 26 B 48 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0053] In one specific embodiment of the present invention, the RTB magnet contains 30.1 wt.% Nd, 0.5 wt.% Dy, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 30.1 wt.% Nd, 0.5 wt.% Dy, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe. 25 Cu 27 B 48 phase, 25 Cu 27 B 48 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%.

[0054] In one specific embodiment of the present invention, the RTB magnet contains 28.6 wt.% Nd, 2 wt.% Dy, 0.21 wt.% Cu, 0.5 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.03 wt.% Al, and 67.64 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 28.6 wt.% Nd, 2 wt.% Dy, 0.21 wt.% Cu, 0.5 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.03 wt.% Al, and 67.64 wt.% Fe. 27 Cu 28 B 45 phase, 27 Cu 28 B 45 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0055] In one specific embodiment of the present invention, the RTB magnet contains 29.6 wt.% Nd, 0.5 wt.% Tb, 0.5 wt.% Dy, 0.21 wt.% Cu, 0.48 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 67.63 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the RTB magnet contain 29.6 wt.% Nd, 0.5 wt.% Tb, 0.5 wt.% Dy, 0.21 wt.% Cu, 0.48 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 67.63 wt.% Fe. 24 Cu 24 B 52 phase, 24 Cu 24 B 52 The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

[0056] The present invention further provides a method for manufacturing the RTB magnet, which includes the steps of subjecting a raw material mixture of each component of the RTB magnet to a sintering treatment and an aging treatment.

[0057] In the present invention, the sintering temperature can be set to a temperature common in this field, preferably 1000 to 1100°C, and further, for example, 1080°C.

[0058] In the present invention, the sintering process is preferably carried out under vacuum conditions, for example, 5×10 -3The test is carried out under vacuum conditions of 0.1 Pa.

[0059] In the present invention, the sintering time can be a time commonly used in the art, and is generally 4 to 8 hours, for example, 6 hours.

[0060] In the present invention, the aging treatment can be a conventional aging process in the art, which generally includes a first stage aging treatment and a second stage aging treatment.

[0061] Here, the temperature of the first stage aging treatment can be a temperature that is common in the art, and is preferably 860 to 920°C, for example, 880°C or 900°C.

[0062] Here, the time for the first stage aging treatment can be a time that is common in the art, and is preferably 2.5 to 4 hours, for example, 3 hours.

[0063] Here, the temperature of the second stage aging treatment can be a temperature that is common in the art, and is preferably 460 to 530°C, for example, 500°C, 510°C, or 520°C.

[0064] Here, the time for the second stage aging treatment is preferably 2.5 to 4 hours, for example, 3 hours.

[0065] In the present invention, when the RTB magnet further contains a heavy rare earth element, it generally further contains grain boundary diffusion after the aging treatment.

[0066] Here, the grain boundary diffusion may be a common process in the art, and it is common to diffuse a heavy rare earth element through the grain boundaries.

[0067] The temperature of the grain boundary diffusion may be 800 to 900° C., for example, 850° C. The time of the grain boundary diffusion may be 5 to 10 hours, for example, 8 hours.

[0068] The method of adding heavy rare earth elements to the RTB magnet can be based on conventional methods in the art, and typically involves adding 0-80% of the heavy rare earth elements during melting and refining, with the remainder added during grain boundary diffusion, for example, 25%, 30%, 40%, 50%, or 67%. The heavy rare earth element added during melting and refining is, for example, Tb.

[0069] For example, if the heavy rare earth element in the RTB magnet is Tb and the Tb content is greater than 0.5 wt.%, 40 to 67% of Tb is added during melting and refining, and the remainder is added during grain boundary diffusion. For example, if the heavy rare earth elements in the RTB magnet are Tb and the Tb content is 0.5 wt.% or less, or if the heavy rare earth element in the RTB magnet is Dy, the heavy rare earth element in the RTB magnet is added during grain boundary diffusion.

[0070] Here, it is common to perform a second aging treatment after the grain boundary diffusion. The temperature and time ranges for the second aging treatment are as described above. The temperature is, for example, 500°C, and the time is, for example, 3 hours.

[0071] In the present invention, as known to those skilled in the art, the sintering process generally further includes the steps of melting, casting, hydro-crushing, pulverizing and magnetic field compaction, which are common in the art.

[0072] Here, the degree of vacuum in the melting and smelting is, for example, 5×10 -2 It is Pa.

[0073] Here, the temperature of the melting and smelting is, for example, 1550°C or lower.

[0074] The melting and refining is generally carried out in a high-frequency vacuum induction melting furnace.

[0075] Here, the casting step employs, for example, a strip casting method.

[0076] Here, the casting temperature may be 1390 to 1460°C, for example, 1400, 1420°C, or 1430°C.

[0077] Here, the thickness of the alloy flakes obtained after the casting may be 0.25 to 0.40 mm, for example, 0.29 mm.

[0078] Here, the hydro-crushing step may generally be carried out in the order of hydrogen absorption, dehydrogenation, and cooling treatment.

[0079] The hydrogen absorption can be carried out under a hydrogen pressure of 0.085 MPa.

[0080] The dehydrogenation can be carried out under conditions of evacuation and elevated temperature, and the dehydrogenation temperature may be 480-520°C, for example 500°C.

[0081] Here, the fine pulverization step can be jet mill pulverization.

[0082] Here, the particle size of the powder obtained after the pulverization can be 4.1 to 4.4 μm, for example, 4.1 μm, 4.2 μm, or 4.3 μm.

[0083] Here, the gas atmosphere during the pulverization may have an oxidizing gas content of 1000 ppm or less, and the oxidizing gas content means the content of oxygen or moisture.

[0084] Here, the pressure during the fine pulverization is, for example, 0.68 MPa.

[0085] Here, after the fine grinding, a lubricant such as zinc stearate is generally further added.

[0086] Here, the amount of the lubricant added may be 0.05 to 0.15% of the powder mass obtained after the fine pulverization, and is, for example, 0.12%.

[0087] Here, the magnetic field compaction is carried out under the protection of a nitrogen atmosphere with a magnetic field strength of 1.8 T or more, for example, a magnetic field strength of 1.8 to 2.5 T.

[0088] The present invention further provides an RTB magnet obtained by employing the above manufacturing method.

[0089] By arbitrarily combining the above-mentioned preferred conditions in accordance with common knowledge in this field, each preferred embodiment of the present invention can be obtained.

[0090] All reagents and raw materials used in the present invention are commercially available. [Effects of the Invention]

[0091] The positive effect of the present invention is that the RTB magnet of the present invention optimizes the compositional relationship between elements such as Cu, Ti, and Ga through the combination of specific amounts of these elements, thereby optimizing the microstructure during the manufacturing process of the RTB magnet, thereby obtaining a magnetic material with high magnetic properties such as high coercivity, high-temperature stability, and squareness ratio. [Brief explanation of the drawings]

[0092] [Figure 1] FIG. 1 is an SEM map of the RTB magnet having the Ti23Cu25B52 phase in Example 1, where the position indicated by the arrow a in FIG. 1 is the Ti23Cu25B52 phase in the triangular region between crystal grains. DETAILED DESCRIPTION OF THE INVENTION

[0093] The present invention will be further described below with reference to examples, but the present invention is not limited to the scope of the examples. In the following examples, experimental methods for which specific conditions are not specified are selected according to conventional methods and conditions or product specifications. Example 1

[0094] Prepare raw materials according to the components of the RTB magnet shown in Table 1, and follow the manufacturing process below. (1) Melting and smelting process: Prepared raw materials (in Table 1, 0.4 wt.% Tb is added during melting and smelting, and the remaining 0.6 wt.% is added during the grain boundary diffusion described below) are melted in a vacuum of 5 × 10 -2 The mixture was placed in a high-frequency vacuum induction melting furnace at 1550°C or less, and the molten liquid was melted and refined at a temperature of 1550°C or less. (2) Casting process: Strip casting method is used to obtain alloy flakes with a thickness of 0.29 mm, and the casting temperature is 1420°C. (3) Hydrogen crushing process: Hydrogen absorption, dehydrogenation, and cooling were performed. Hydrogen absorption was performed under a hydrogen pressure of 0.085 MPa. Dehydrogenation was performed under conditions of evacuation and heating, and the dehydrogenation temperature was 500°C. (4) Fine pulverization step: The particle size of the powder obtained by jet mill pulverization in an atmosphere with an oxidizing gas content of 100 ppm or less is 4.2 μm, where oxidizing gas refers to the oxygen or water content. The pressure in the grinding chamber for jet mill pulverization is 0.68 MPa. After pulverization, zinc stearate is added as a lubricant in an amount of 0.12% of the weight of the powder after mixing. (5) Magnetic field compaction process: The magnetic field compaction method was adopted, and compaction was carried out under the protection of a magnetic field strength of 1.8 to 2.5 T and a nitrogen atmosphere. (6) Sintering process: The sintering process is carried out at 5 × 10 -3 Sintering is performed under vacuum conditions of 1080°C and cooling is performed. Sintering is performed for 6 hours at 1080°C, and before cooling, Ar gas can be introduced so that the gas pressure reaches 0.05 MPa. (7) Aging treatment: The first stage aging temperature is 900°C and the time is 3 hours, and the second stage aging temperature is 510°C and the time is 3 hours. (8) Grain boundary diffusion treatment: The remaining 0.6 wt.% of Tb is diffused into the magnetic material by grain boundary diffusion treatment. The temperature of the grain boundary diffusion treatment is 850°C, and the time is 8 hours. After the grain boundary diffusion, a second stage aging treatment is performed again at a temperature of 500°C, and the time is 3 hours.

[0095] The RTB magnets in Examples 2 to 21 and Comparative Examples 1 to 5 were manufactured by preparing raw materials with the components shown in Table 1 below and following the manufacturing process of Example 1. Here, in Examples 2, 3, 7, 9 to 18 and Comparative Examples 1 to 4, 0.4 wt% Tb was added during the melting and refining process, with the remaining Tb entering the RTB magnet through grain boundary diffusion, in Examples 4, 5, 19, and 20, the heavy rare earth elements were all added in the grain boundary diffusion process, and in Example 21, Tb was added during the melting and refining process, and Dy was added during the grain boundary diffusion process. Effect Example 1

[0096] 1. Component Measurement: Measurement was performed using a high-frequency inductively coupled plasma optical emission spectrometer (ICP-OES) for the RTB magnets in Examples 1 to 21 and Comparative Examples 1 to 5. The test results are shown in Table 1.

[0097] Table 1: Composition (wt.%) of RTB magnets in Examples 1 to 21 and Comparative Examples 1 to 4 JPEG0007733740000001.jpg193161

[0098] Note: " / " indicates that the element in question is not included. C, O, and Mn are inevitably introduced into the final RTB magnet during manufacturing, and the denominators of the content percentages calculated for each example and comparative example do not include these impurities. On the other hand, Example 15 in Table 1 contains 0.14 wt.% Al. As is well known, a portion of this Al content is an impurity introduced during manufacturing, while the remaining examples and comparative examples contain less than 0.08 wt. parts of Al introduced during manufacturing.

[0099] 2. Magnetic property test The RTB magnets in Examples 1 to 21 and Comparative Examples 1 to 5 were tested using a PFM pulse-type BH demagnetization curve testing device to obtain data on residual magnetic flux density (Br), intrinsic coercivity (Hcj), maximum energy product (BHmax), and squareness ratio (Hk / Hcj). The test results are shown in Table 2 below.

[0100] [Table 2]

[0101] 3. Microstructure testing Detection by FE-EPMA: The vertically oriented surfaces of the RTB magnets in Examples 1 to 21 and Comparative Examples 1 to 5 were polished and detected using a field emission electron probe microanalyzer (FE-EPMA, JEOL, 8530F). First, the distribution of elements such as Cu, Ti, and B within the RTB magnet was determined by FE-EPMA surface scanning, and then the content of each element in the Ti-Cu-B phase was determined by FE-EPMA single-point quantitative analysis. The test conditions were an acceleration voltage of 15 kV and a probe beam current of 50 nA.

[0102] As shown in Figure 1, Figure 1 is an SEM map of the RTB magnet in Example 1 obtained by FE-EPMA detection. The position of the Ti-Cu-B phase was determined using the SEM map, and this was located in the triangular region between the crystal grains. The area ratio of the Ti-Cu-B phase was then calculated. The position indicated by arrow a in Figure 1 is the Cu-Nb-Fe phase in the triangular region between the crystal grains, as determined by single-point quantitative analysis.

[0103] As can be seen from the measurements and calculations, in Example 1, a Ti-Cu-B phase is formed in the triangular regions between the crystal grains of the RTB magnet, and the atomic percentages of Ti, Cu, and B in this Ti-Cu-B phase are 23:25:52. 23 Cu 25 B 52 Ti phase. 23 Cu 25 B 52 The ratio of the area of ​​the Ti-Cu-B phase to the total area of ​​the "intergranular triangular regions and neodymium-rich phase" (abbreviated as "proportion of the area of ​​the phase" in Table 3) is 3.5%. The area of ​​the Ti-Cu-B phase and the total area of ​​the "intergranular triangular regions and neodymium-rich phase" each refer to the area occupied by the cross section of the RTB magnet (the vertically oriented surface described above) detected by FE-EPMA.

[0104] The results of FE-EPMA detection for the RTB magnets of Examples 1 to 21 and Comparative Examples 1 to 5 are shown in Table 3 below.

[0105] [Table 3]

[0106] Although specific embodiments of the present invention have been described above, those skilled in the art will understand that these are merely illustrative and that the scope of protection of the present invention is limited by the claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, and all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An RTB magnet comprising: R: ≧30.0 wt. %, wherein R is a rare earth element and T includes Fe; Cu: 0.16 to 0.6wt. %, Ti: 0.4-0.8wt. %, Ga: ≦0.2 wt. %, but not 0; B: 0.955-1.2wt. %, The balance is Fe, and wt. % is the mass percentage of the mass of each component relative to the total mass of each component. The R-T-B magnet further comprises a Ti x Cu y B 100-x-y phase, where x is 20-30, y is 20-30, and 100-x-y is 40-60, and x, y, and 100-x-y respectively represent the atomic percentage contents of Ti, Cu, and B in the Ti x Cu y B 100-x-y phase, the Ti x Cu y B 100-x-y phase is located in intergranular triangular regions, and the ratio of the area of ​​the Ti x Cu y B 100-x-y phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 1-5%. An RTB magnet characterized by:

2. The content of R is 30.5 wt. % or more, and / or R further contains Nd; Here, the content of Nd is 29 to 31 wt. %, where wt. % is the mass percentage relative to the total mass of each component, and / or the R further includes at least one of Pr and RH, the RH being a heavy rare earth element; wherein the Pr content is 0.3 wt. % or less, Here, the content of RH is 2 wt. % or less, where wt. % is the mass percentage of each component relative to the total mass of the component; wherein the type of RH includes Tb and / or Dy; When R contains Tb, the content of Tb is 1.4 wt. % or less, where wt. % is a mass percentage relative to the total mass of each component; When R contains Dy, the content of Dy is 0.5 to 2 wt. %, where wt. % is a mass percentage relative to the total mass of each component; the ratio of the atomic percentage content of RH to the atomic percentage content of R is 0.1 or less, and the atomic percentage content means the atomic percentage of each component relative to the total content of each component; 2. The RTB magnet according to claim 1.

3. The Cu content is 0.16 to 0.45 wt. %, and / or the Ti content is 0.4 to 0.7 wt. %, and / or the Ga content is 0.01 to 0.19 wt. %, and / or the content of B is 0.96 to 1.15 wt. %, and / or the ratio of the atomic percentage content of B to the atomic percentage content of R in the R-T-B magnet is 0.35 or more; and / or the Fe content is 66 to 68 wt. %; 2. The RTB magnet according to claim 1.

4. The RTB magnet further contains Al, wherein the Al content is 0.18 wt. % or less, and / or the RTB magnet further contains Co; Here, the content of Co is 0.5 to 1.5 wt %, and wt % is the mass percentage of the total mass of each component.

2. The RTB magnet according to claim 1.

5. The value of x is 21, 22, 23, 24, 25, or 27; the value of y is 21, 22, 23, 24, 25, 26, or 27; the value of 100-x-y is 48, 49, 50, 51, 52, 53, 55 or 58; The Ti ｘ Cu ｙ The ratio of the area of ​​the B100-xy phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 2.5 to 4%.

5. The RTB magnet according to claim 1, wherein the magnet is a quartz crystal.

6. The R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.68 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the triangular regions between crystal grains of the R-T-B magnet. ２３ Cu ２５ B ５２ phase, ２３ Cu ２５ B ５２ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%, Alternatively, the R-T-B magnet contains 29.8 wt.% Nd, 0.8 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２３ Cu ２４ B ５３ phase, ２３ Cu ２４ B ５３ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%; Alternatively, the R-T-B magnet contains 30 wt. % Nd, 0.6 wt. % Tb, 0.21 wt. % Cu, 0.45 wt. % Ti, 1 wt. % B, 0.02 wt. % Ga, 0.04 wt. % Al, and 67.68 wt. % Fe, where wt. % is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２２ Cu ２６ B ５２ phase, ２２ Cu ２６ B ５２ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.6%; Alternatively, the R-T-B magnet contains 30.2 wt.% Nd, 0.4 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.08 wt.% Al, and 67.64 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the triangular regions between crystal grains of the R-T-B magnet. ２５ Cu ２５ B ５０ phase, ２５ Cu ２５ B ５０ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%, Alternatively, the R-T-B magnet contains 30.4 wt.% Nd, 0.2 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.02 wt.% Al, and 67.7 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the triangular regions between crystal grains of the R-T-B magnet. ２４ Cu ２６ B ５０ phase, ２４ Cu ２６ B ５０ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%, Alternatively, the R-T-B magnet contains 30.6 wt.% Nd, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the R-T-B magnet. ２２ Cu ２３ B ５５ phase, ２２ Cu ２３ B ５５ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.2%; Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 1 wt.% Co, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 66.68 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２６ Cu ２５ B ４９ phase, ２６ Cu ２５ B ４９ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.6%, Alternatively, the R-T-B magnet contains 30.6 wt.% Nd, 1 wt.% Co, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 66.66 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the R-T-B magnet. ２４ Cu ２５ B ５１ phase, ２４ Cu ２５ B ５１ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.2%; Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.19 wt.% Ga, 0.05 wt.% Al, and 67.5 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the R-T-B magnet. ２３ Cu ２５ B ５２ phase, ２３ Cu ２５ B ５２ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 2.9%, Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.55 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.57 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the R-T-B magnet. ２７ Cu ２５ B ４８ phase, ２７ Cu ２５ B ４８ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%, Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.7 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.43 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２５ Cu ２５ B ５０ phase, ２５ Cu ２５ B ５０ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%; Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.34 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.54 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the R-T-B magnet. ２４ Cu ２４ B ５２ phase, ２４ Cu ２４ B ５２ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.7%; Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1.04 wt.% B, 0.02 wt.% Ga, 0.04 wt.% Al, and 67.64 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２１ Cu ２１ B ５８ phase, ２１ Cu ２１ B ５８ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.6%, Alternatively, the R-T-B magnet contains 31 wt. % Nd, 1 wt. % Tb, 0.21 wt. % Cu, 0.45 wt. % Ti, 0.96 wt. % B, 0.02 wt. % Ga, 0.06 wt. % Al, and 66.3 wt. % Fe, where wt. % is the mass percentage of each component relative to the total mass of each component, and Ti is present in the triangular regions between crystal grains of the R-T-B magnet. ２５ Cu ２３ B ５２ phase, ２５ Cu ２３ B ５２ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.9%; Alternatively, the R-T-B magnet contains 29.8 wt.% Nd, 0.8 wt.% Tb, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.14 wt.% Al, and 67.58 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２４ Cu ２６ B ５０ phase, ２４ Cu ２６ B ５０ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%; Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.45 wt.% Cu, 0.6 wt.% Ti, 1.15 wt.% B, 0.06 wt.% Ga, 0.05 wt.% Al, and 67.09 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the triangular regions between crystal grains of the R-T-B magnet. ２７ Cu ２３ B ５０ phase, ２７ Cu ２３ B ５０ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%, Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 1 wt.% Tb, 0.16 wt.% Cu, 0.4 wt.% Ti, 0.96 wt.% B, 0.01 wt.% Ga, 0.07 wt.% Al, and 67.8 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the intergranular triangular regions of the R-T-B magnet. ２４ Cu ２５ B ５１ phase, ２４ Cu ２５ B ５１ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%; Alternatively, the R-T-B magnet contains 30.1 wt.% Nd, 0.5 wt.% Dy, 0.21 wt.% Cu, 0.45 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.05 wt.% Al, and 67.67 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and Ti is present in the triangular regions between crystal grains of the R-T-B magnet. ２５ Cu ２７ B ４８ phase, ２５ Cu ２７ B ４８ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.4%; Alternatively, the R-T-B magnet contains 28.6 wt.% Nd, 2 wt.% Dy, 0.21 wt.% Cu, 0.5 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.03 wt.% Al, and 67.64 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２７ Cu ２８ B ４５ phase, ２７ Cu ２８ B ４５ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%, Alternatively, the R-T-B magnet contains 29.6 wt.% Nd, 0.5 wt.% Tb, 0.5 wt.% Dy, 0.21 wt.% Cu, 0.48 wt.% Ti, 1 wt.% B, 0.02 wt.% Ga, 0.06 wt.% Al, and 67.63 wt.% Fe, where wt.% is the mass percentage of each component relative to the total mass of each component, and the intergranular triangular regions of the R-T-B magnet contain Ti. ２４ Cu ２４ B ５２ phase, ２４ Cu ２４ B ５２ The ratio of the area of ​​the phase to the total area of ​​the "neodymium-rich phase and intergranular triangular regions" is 3.5%.

2. The RTB magnet according to claim 1.

7. A method for manufacturing an RTB magnet, comprising: a step of subjecting a raw material mixture of the components of the RTB magnet according to any one of claims 1 to 4 and 6 to a sintering treatment and an aging treatment; A method for producing an RTB magnet, comprising:

8. The sintering temperature is 1000 to 1100°C. and / or the sintering time is 4 to 8 hours; and / or the aging treatment includes a first stage aging treatment and a second stage aging treatment, wherein the temperature of the first stage aging treatment is 860 to 920°C, and the time of the first stage aging treatment is 2.5 to 4 hours; wherein the temperature of the second stage aging treatment is 460 to 530°C, and the time of the second stage aging treatment is 2.5 to 4 hours; and / or, if the RTB magnet further contains a heavy rare earth element, further including grain boundary diffusion after the aging treatment; wherein the temperature of the grain boundary diffusion is 800 to 900°C, and the time of the grain boundary diffusion is 5 to 10 hours; Here, the method of adding heavy rare earth elements to the R-T-B magnet is to add 0-80% of the heavy rare earth elements during melting and refining, and the remainder during grain boundary diffusion; if the heavy rare earth element in the R-T-B magnet is Tb and the Tb content is greater than 0.5 wt.%, 40-67% of Tb is added during melting and refining, and the remainder is added during grain boundary diffusion; if the heavy rare earth elements in the R-T-B magnet are Tb and Tb content is 0.5 wt.% or less, or if the heavy rare earth element in the R-T-B magnet is Dy, the heavy rare earth element in the R-T-B magnet is added during grain boundary diffusion; Here, the method further includes performing a second stage aging treatment again after the grain boundary diffusion, wherein the temperature of the second stage aging treatment again is 460 to 530°C, and the time of the second stage aging treatment again is 2.5 to 4 hours.

8. The method for producing an RTB magnet according to claim 7.

9. Before the sintering process, further steps of melting, casting, hydro-crushing, pulverizing and magnetic field compaction are included; Here, the temperature of the melting and smelting is 1550°C or less, wherein the casting temperature is 1390 to 1460°C; Here, the hydro-crushing process is carried out in the order of hydrogen absorption, dehydrogenation, and cooling treatment, wherein the particle size of the powder obtained after the pulverization is 4.1 to 4.4 μm; Here, the magnetic field strength of the magnetic field molding is 1.8 to 2.5 T.

8. The method for producing an RTB magnet according to claim 7.

10. An RTB magnet manufactured by the method for manufacturing an RTB magnet according to claim 7.

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