A kind of preparation method of linear remanence temperature coefficient permanent magnet material

Abstract

The invention provides a preparation method of a permanent magnet material with linear remanence temperature coefficient. The preparation method is characterized by smelting alloy A and alloy B respectively in a vacuum induction melting furnace and pulverizing to a millimetre-sized powder, then preparing alloy A & B according to a certain proportion, further pulverizing the alloy A & B under the protection of a medium, mixing well, and receiving the permanent magnet material with linear remanence temperature coefficient after the aging treatment of molding, sintering, solution solidifying and stepping. The alloy A belongs to samarium cobalt without heavy rare earth, while the alloy B belongs to the material containing heavy rare earth. By the preparation method, the permanent magnet material has the linear remanence temperature coefficient within the range of the room temperature to 100 DEG C, and the temperature coefficient of open magnetic flux reaches a magnitude of five-hundred thousandths.

Description

technical field

[0001] The invention relates to the field of rare earth permanent magnet material manufacture, in particular to a preparation method of a linear remanence temperature coefficient permanent magnet material. Background technique

[0002] The permanent magnet material is used as a magnetic field source to provide a stable magnetic field or flux for the magnetic circuit. Generally, the magnetism of permanent magnet materials gradually decreases with the increase of temperature, and the change of magnetism with temperature is nonlinear. Usually, permanent magnet materials with nonlinear low remanence temperature coefficient are used in high-precision instruments and other devices, and internal compensation method is required to improve the temperature stability of high-precision devices. Although the magnetism of permanent magnet materials with low temperature coefficient changes little in a certain temperature range, such as room temperature to 100°C, it can sti...

Examples

Embodiment 1

[0017] According to the preparation method of the linear remanence temperature coefficient permanent magnet material proposed by the present invention, the alloys A and B are respectively smelted in a vacuum induction furnace, and the composition is shown in Table 1. First at N 2 Under protection, the two alloys were crushed to powders on the order of millimeters, and then the crushed alloys A and B were mixed in a ratio of 50:50, and rolling ball milling was carried out under the protection of absolute alcohol for 5 hours. The particle size of the mixed powder after ball milling was Reaching the micron level, after the above-mentioned powder is formed, it is sintered at 1230°C for 1 hour, then cooled to 1180°C at a rate of 1.5°C / min for 3 hours of solid solution treatment, then quenched and placed in the Room temperature, obtain preliminary blank; After preliminary blank is kept at 760 DEG C for 20 hours, cool to 600 DEG C with 1.5 DEG C / min speed and keep warm for 3.5 hours,...

Embodiment 2

[0022] Alloys A and B were smelted in a vacuum induction furnace, and their compositions are shown in Table 2. First, under the protection of Ar, the two alloys were crushed to millimeter-scale powders, and then the crushed alloys A and B were mixed in a ratio of 40:60, and rolling ball milling was carried out under the protection of absolute alcohol for 10 hours. The particle size of the powder reaches the micron level. After the above powder is formed, it is sintered at 1255°C for 0.5 hours, then cooled to 1220°C at a speed of 1.5°C / min for 2 hours of solid solution treatment, and quenched to Room temperature, obtain preliminary blank; After preliminary blank is incubated at 830 DEG C for 10 hours, be cooled to 600 DEG C with 1.5 DEG C / min speed and be incubated 2 hours, then with 2.0 DEG C / min speed cooling 500 DEG C and be incubated 4 hours, Then cool to 400°C at a rate of 2.2°C / min and keep it warm for 10 hours, and quench it to room temperature to obtain a permanent magn...

Embodiment 3

[0026] Alloys A and B were smelted in a vacuum induction furnace, and their compositions are shown in Table 3. First, under the protection of N2, the two alloys were crushed to powders of the order of millimeters, and then the crushed alloys A and B were mixed at a ratio of 55:45, and rolling ball milling was carried out under the protection of gasoline for 8 hours. The particle size of the mixed powder after ball milling was Reaching the micron level, after the above powder is formed, it is sintered at 1240°C for 0.5 hours, then cooled to 1200°C at a speed of 1.5°C / min for 3 hours of solid solution treatment, and quenched to room temperature. Obtain the preliminary blank; After the preliminary blank is kept at 800°C for 15 hours, it is cooled to 600°C and kept at 1.5°C / min for 3 hours, then cooled at 2.0°C / min for 500°C and kept at 3 hours, then Cool at 2.2°C / min to 400°C for 15 hours, and quench to room temperature to obtain a linear remanence temperature coefficient permane...

technical field

[0001] The invention relates to the field of rare earth permanent magnet material manufacture, in particular to a preparation method of a linear remanence temperature coefficient permanent magnet material. Background technique

[0002] The permanent magnet material is used as a magnetic field source to provide a stable magnetic field or flux for the magnetic circuit. Generally, the magnetism of permanent magnet materials gradually decreases with the increase of temperature, and the change of magnetism with temperature is nonlinear. Usually, permanent magnet materials with nonlinear low remanence temperature coefficient are used in high-precision instruments and other devices, and internal compensation method is required to improve the temperature stability of high-precision devices. Although the magnetism of permanent magnet materials with low temperature coefficient changes little in a certain temperature range, such as room temperature to 100°C, it can sti...

Examples

Embodiment 1

[0017] According to the preparation method of the linear remanence temperature coefficient permanent magnet material proposed by the present invention, the alloys A and B are respectively smelted in a vacuum induction furnace, and the composition is shown in Table 1. First at N 2 Under protection, the two alloys were crushed to powders on the order of millimeters, and then the crushed alloys A and B were mixed in a ratio of 50:50, and rolling ball milling was carried out under the protection of absolute alcohol for 5 hours. The particle size of the mixed powder after ball milling was Reaching the micron level, after the above-mentioned powder is formed, it is sintered at 1230°C for 1 hour, then cooled to 1180°C at a rate of 1.5°C / min for 3 hours of solid solution treatment, then quenched and placed in the Room temperature, obtain preliminary blank; After preliminary blank is kept at 760 DEG C for 20 hours, cool to 600 DEG C with 1.5 DEG C / min speed and keep warm for 3.5 hours,...

Embodiment 2

[0022] Alloys A and B were smelted in a vacuum induction furnace, and their compositions are shown in Table 2. First, under the protection of Ar, the two alloys were crushed to millimeter-scale powders, and then the crushed alloys A and B were mixed in a ratio of 40:60, and rolling ball milling was carried out under the protection of absolute alcohol for 10 hours. The particle size of the powder reaches the micron level. After the above powder is formed, it is sintered at 1255°C for 0.5 hours, then cooled to 1220°C at a speed of 1.5°C / min for 2 hours of solid solution treatment, and quenched to Room temperature, obtain preliminary blank; After preliminary blank is incubated at 830 DEG C for 10 hours, be cooled to 600 DEG C with 1.5 DEG C / min speed and be incubated 2 hours, then with 2.0 DEG C / min speed cooling 500 DEG C and be incubated 4 hours, Then cool to 400°C at a rate of 2.2°C / min and keep it warm for 10 hours, and quench it to room temperature to obtain a permanent magn...

Embodiment 3

[0026] Alloys A and B were smelted in a vacuum induction furnace, and their compositions are shown in Table 3. First, under the protection of N2, the two alloys were crushed to powders of the order of millimeters, and then the crushed alloys A and B were mixed at a ratio of 55:45, and rolling ball milling was carried out under the protection of gasoline for 8 hours. The particle size of the mixed powder after ball milling was Reaching the micron level, after the above powder is formed, it is sintered at 1240°C for 0.5 hours, then cooled to 1200°C at a speed of 1.5°C / min for 3 hours of solid solution treatment, and quenched to room temperature. Obtain the preliminary blank; After the preliminary blank is kept at 800°C for 15 hours, it is cooled to 600°C and kept at 1.5°C / min for 3 hours, then cooled at 2.0°C / min for 500°C and kept at 3 hours, then Cool at 2.2°C / min to 400°C for 15 hours, and quench to room temperature to obtain a linear remanence temperature coefficient permane...

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