Abstract: The invention belongs to the technical field of permanent magnet materials, and relates to a preparation method of a samarium-cobalt permanent magnet with high mechanical properties, comprising the following steps: performing melting, pulverizing, orientation shaping, cold isostatic pressing, sintering, solution, aging and heat treatment sequentially on raw materials to obtain the samarium-cobalt permanent magnet. The number of heat treatment cycles ranges from 1 to 10, and an external magnetic field and an external stress are applied during one or multiple heat treatment cycles. The magnetic field intensity of the external magnetic field is 1-50 kOe, and the magnitude of the external 10 stress is 5-500 MPa. Compared to the traditional process, this method not only improves the magnetic properties, but also greatly enhances the mechanical properties of the samarium-cobalt magnet, achieving a synergistic improvement in the magnetic and mechanical properties.

Abstract: The present invention provides a samarium-iron-based rare earth permanent magnet material containing a grain boundary phase, having a chemical formula of SmaFebCocTidMe, wherein 0.5?a?1.5, 7.5?b?9.0, 2.0?c?3.0, 0.5?d?1.5, 0.1?e?2.0, and M is selected from the group consisting of B, C, Al, Si and a combination thereof. The present invention further provides a method for preparing a samarium-iron-based rare earth permanent magnet material containing a grain boundary phase, comprising providing raw materials of the alloy, melting and casting the raw materials to obtain a master alloy; and subjecting the master alloy to rapid quenching and melt-spinning to obtain the samarium-iron-based rare earth permanent magnet material containing the grain boundary phase. In the method, a problem that a non-magnetic grain boundary phase cannot be formed in the samarium-iron-based rare earth permanent magnet material due to the lack of liquid phase is solved, and the purity of the main phase is improved.

Abstract: A preparation method of a rare earth permanent magnetic material comprises one or more times of cryogenic treatment and tempering treatment. When the preparation method comprises one time of cryogenic treatment and tempering treatment, the cryogenic treatment is performed between sintering treatment and the tempering treatment, or is performed after the tempering treatment. When the preparation method comprises two or more times of cryogenic treatment and tempering treatment, at least one time of cryogenic treatment is performed between sintering treatment and the tempering treatment, and at least one time of cryogenic treatment is performed after the tempering treatment. The preparation method can refine and homogenize the structure and realize quick and convenient treatment, and can effectively improve the mechanical performance of the rare earth permanent magnetic material and maintain good magnetic performance.

Abstract: A transmission electron microscope sample holder capable of applying a magnetic field is provided. The transmission electron microscope sample holder includes a holder body and a holder head. The holder head is arranged at an end of the holder body and provided with a magnetic field generation device. The magnetic field generation device is provided with magnetic field generation end surface. The thickness of the magnetic field generation end surface is in a range of 100 nanometers to 280 micrometers. And the thickness is of a size that is parallel to a direction of an electron beam in a transmission electron microscope.

Abstract: The present disclosure discloses a method for the magnetism stabilizing treatment of a permanent magnet material. The method can include the following steps: providing a permanent magnet material having a positive temperature coefficient of coercivity; magnetizing the permanent magnet material at a temperature T3 with a range of ?200 degree centigrades to 200 degree centigrades; and performing a magnetism stabilizing treatment towards the permanent magnet material with temperature decreased in a range of the temperature T3 to a temperature T4, or at the temperature T3.

Abstract: The present disclosure discloses a high-temperature-stability permanent magnet material and an application thereof. The microstructure of the permanent magnet material comprises a first magnetic phase and a second magnetic phase; the first magnetic phase is a magnetic phase with uniaxial anisotropy, and the second magnetic phase is a magnetic phase with spin reorientation transition; and the first magnetic phase and the second magnetic phase are isolated from each other; and the absolute value of the temperature coefficient of saturation magnetization intensity of the first magnetic phase is less than 0.02%/° C. By means of the permanent magnet material comprising the first magnetic phase and the second magnetic phase, a positive temperature coefficient of coercivity can be obtained, so that obtaining a low temperature coefficient of coercivity can be targeted, regular and universal.

Abstract: The present disclosure discloses a method for the magnetism stabilizing treatment of a permanent magnet material. The method can include the following steps: providing a permanent magnet material having a positive temperature coefficient of coercivity; magnetizing the permanent magnet material at a temperature T3 with a range of ?200 degree centigrades to 200 degree centigrades; and performing a magnetism stabilizing treatment towards the permanent magnet material with temperature decreased in a range of the temperature T3 to a temperature T4, or at the temperature T3.

Abstract: The present disclosure discloses a high-temperature-stability permanent magnet material and an application thereof. The microstructure of the permanent magnet material comprises a first magnetic phase and a second magnetic phase; the first magnetic phase is a magnetic phase with uniaxial anisotropy, and the second magnetic phase is a magnetic phase with spin reorientation transition; and the first magnetic phase and the second magnetic phase are isolated from each other; and the absolute value of the temperature coefficient of saturation magnetization intensity of the first magnetic phase is less than 0.02%/° C. By means of the permanent magnet material comprising the first magnetic phase and the second magnetic phase, a positive temperature coefficient of coercivity can be obtained, so that obtaining a low temperature coefficient of coercivity can be targeted, regular and universal.

Abstract: High corrosion resistant sintered NdFeB magnets are provided with a composition by mass % of NdxRx1Fe100-(x+x1+y+y1+z)TyMy1Bz, where 24?x?33, 0?x1?15, 1.43?y?16.43, 0.1?y1?0.6, 0.91?z?1.07, R is one or more selected from the group consisting of Dy, Tb, Pr, Ce and Gd, T is one or more selected from the group consisting of Co, Cu and Al, M is one or more selected from the group consisting of Nb, Zr, Ti, Cr and Mo, and M is distributed within the grain boundary phase of the NdFeB magnets.