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A NdFeB, magnet technology, applied in magnetic objects, magnetic materials, inductance/transformer/magnet manufacturing and other directions, can solve the problems that the magnetic performance cannot be maximized and cannot meet the requirements.
Inactive Publication Date: 2016-11-23
京磁材料科技股份有限公司
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Problems solved by technology
With the increasing demand for applications, many technologies to improve the performance of sintered NdFeB have been proposed. Although they have been improved accordingly, they still cannot meet the requirements. In recent years, the research on the addition of rare earth elements has become a hot spot.
However, when rare earth elements, especially multiple rare earth elements, are added at the same time, the magnetic properties of the prepared NdFeB magnets cannot be maximized.
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Embodiment 1
[0077] The composition of a alloy is: Pr-Nd: 29.5%; Dy: 0.9%; Nb: 0.25%; Al: 0.3%; B: 1.01%; Cu: 0.15%; Co: 1%; Ho: 0.6%; the balance For Fe.
[0078] The sintered a-alloy prepared by the traditional sintered NdFeB process is subjected to primary tempering, that is, evacuated to below 1Pa, heated to 900°C for 4 hours, and cooled to 80°C with argon air; Fire, that is, evacuate to below 1Pa, heat to 515°C, cool down to 500°C after 2 hours, and cool at 500°C for 2 hours, take the sample after secondary tempering as a1 and test the density and magnetic properties; finally carry out Three-stage tempering, that is, evacuate to below 1Pa, heat to 475°C, cool down to 460°C after 2 hours, and cool at 460°C for 2 hours, take the sample after the three-stage tempering as a2 and test the density and magnetic properties .
Embodiment 2
[0080] The composition of the alloy is Pr-Nd: 29%; Dy: 0.8%; Tb: 0.5%; Nb: 0.25%; Al: 0.3%; B: 1.01%; Cu: 0.25%; Co: 1%; Ho: 0.5% ; The balance is Fe.
[0081] The sintered b-alloy prepared by the traditional sintered NdFeB process is subjected to primary tempering, that is, evacuated to below 1Pa, heated to 900°C and kept for 4 hours, then air-cooled to 80°C with argon air to be released; and then subjected to secondary tempering Fire, that is, evacuate to below 1Pa, heat to 530°C, cool down to 515°C after 2 hours, and cool at 515°C for 2 hours, take the sample after secondary tempering as b1 and test the density and magnetic properties; Three-stage tempering, that is, evacuate to below 1Pa, heat to 490°C, cool down to 475°C after 2 hours, and cool at 475°C for 2 hours, take the sample after the three-stage tempering as b2 and test the density and magnetic properties ;Finally, perform four-stage tempering, that is, vacuumize to below 1Pa, heat to 475°C, cool down to 460°C af...
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Abstract
The invention provides a tempering technology for an NdFeB magnet. The tempering technology comprises steps as follows: firstly, under the condition of vacuum or protective gas, a sintered NdFeB magnet blank is subjected to primary heating and primary heat preservation, and a primary tempered intermediate is obtained after cooling; then, the primary tempered intermediate obtained in the step is tempered N times, and the NdFeB magnet is obtained; each tempering process is as follows: heating is performed firstly, cooling is performed, heat preservation is performed, and cooling is performed finally; the heat preservation temperature is T, and heat preservation temperatures of the tempering processes decrease sequentially; n is a natural number larger than or equal to 1. The technology starts from the tempering processes during preparation of the magnet, a technology of multistage tempering heat treatment is adopted, that is, a method adopting three-stage tempering after two-stage tempering is adopted, a multistage tempering method adopting four-stage tempering after two-stage tempering and three-stage tempering can be adopted, the coercivity can be effectively improved, and the density and square degree of the magnet can be improved.
Description
technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a tempering process of an NdFeB magnet. Background technique [0002] A magnet is a substance that can generate a magnetic field and has the property of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals. Magnets are generally divided into permanent magnets and soft magnets. Most of the materials used as magnetizers and electromagnets are soft magnets, and their polarity changes with the polarity of the applied magnetic field; permanent magnets are hard magnets, which can maintain their magnetic properties for a long time. , It is not easy to lose magnetization, and it is not easy to be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. [0003] Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets me...
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