Preparation method of samarium-cobalt permanent magnet material

A permanent magnet material, samarium cobalt technology, applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve problems such as deformation, irreversible magnetic loss increase, affecting use, etc.

Inactive Publication Date: 2020-04-03
杭州科德磁业有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Although this type of material can maintain good remanence (Br) within 300°C, if the external temperature exceeds 300°C, the BH curve of the material will be deformed, resulting in an increase in irreversible magnetic loss, which will eventually affect the use

Method used

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  • Preparation method of samarium-cobalt permanent magnet material

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Embodiment Construction

[0019] Let Sm(Co 0.8 Cu 0.089 Fe 0.088 Zr 0.022 ) 7.17 As an example, the specific implementation manner of the present invention is further described:

[0020] 1 Ingredients: Select high-purity raw materials (Sm / RE≥99.7%, Co≥99.6%, Cu+Ag≥99.95%, Zr+Hf≥99.3%, Fe≥99.75%) according to Sm (Co 0.8 Cu 0.089 Fe 0.088 Zr 0.022 ) 7.17 The atomic ratio is used for batching;

[0021] 2 Melting: put the configured raw materials into the crucible in the order of Fe-Zr-Fe-Co-Cu-Sm, cover the furnace cover and vacuumize, and start heating when the vacuum degree of the melting furnace is ≤7Pa (15KW± 5KW), this process is a pre-heating process, the main purpose is to deeply remove the residual air and moisture of raw materials, crucible and furnace wall, etc., to prevent the oxidation of raw materials from affecting the atomic ratio of each element. Stop vacuuming when preheating to a vacuum degree of ≤5Pa, and fill the furnace with Ar gas of -0.06±0.03MPa (to prevent the volatiliza...

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Abstract

The invention discloses a preparation method of a samarium-cobalt permanent magnet material. The preparation method comprises the following steps: material preparation is carried out according to Sm (Co <1-u-v-w> Cu Fe <v> Zr <w>) z, wherein u = 0.08-0.09, v = 0.08-0.09, w = 0.02-0.03 and z = 7.1-7.2; the prepared raw materials are sequentially put into a vacuum induction melting furnace according to the sequence of Fe-Zr-Fe-Co-Cu-Sm to be subjected to high-temperature melting, samarium-cobalt alloy ingots with uniform components are obtained, the alloy ingots are subjected to coarse crushing, intermediate crushing and jet milling step-by-step crushing, and finally powder with the mixed particle size SDM within the range of 3.2-3.8 microns is obtained; the powder is pressed in a vertical pressing mode, and then a pressed blank is obtained through isostatic pressing; and the pressed blank is placed in a vacuum sintering furnace to be sintered, subjected to solid solution and aged.On the premise of not adding trace elements (Mn, Er and the like), the problems of high temperature resistance and high coercive force at the room temperature of 500 DEG C of the 2: 17 type samarium-cobalt permanent magnet can be solved through the combination of five metals including metal cobalt (Co), metal samarium (Sm), metal iron (Fe), metal copper (Cu) and metal zirconium (Zr) and process control of the process.

Description

technical field [0001] The invention belongs to the technical field of samarium-cobalt permanent magnet material preparation, and in particular relates to a preparation method of samarium-cobalt permanent magnet material with high coercive force and high temperature. Background technique [0002] Samarium-cobalt permanent magnet materials are known for their high magnetic properties, strong corrosion resistance and high operating temperature, so they are widely used in gyroscopes, radars, ion propulsion motors, high-temperature oil pumps, etc. However, according to different application requirements, the requirements for the magnetic properties of samarium cobalt permanent magnets are also different. At this stage, research is mainly carried out from two aspects: one is research on materials with low temperature coefficient of remanence; the other is research on materials with high temperature resistance. At this stage, the research on materials with low remanence temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0556H01F1/0557H01F41/0253H01F41/0266
Inventor 向俊尤张保国付勇兵
Owner 杭州科德磁业有限公司
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