A kind of glass welding method of sintered samarium cobalt permanent magnet

A glass welding and permanent magnet technology, applied in the field of rare earth permanent magnet welding, can solve the problems of magnet rupture and high risk, and achieve the effects of short welding time, low welding temperature and high strength

Active Publication Date: 2022-06-14
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Epoxy resin will age when used for a long time, and samarium cobalt magnets are brittle materials, and mechanical connections can easily lead to magnet cracks, which is very risky
In order to solve the above problems, Chinese invention patent application CN105081606A discloses a ribbon-shaped brazing material for rare earth cobalt-based permanent magnets and its preparation method, and Chinese invention patent application CN105081498A proposes a welding method for sintered samarium cobalt magnets. Welding is completed during the material preparation process, and the welding temperature is greater than 800°C, but there is no report in the prior art about the technical solution of glass welding samarium cobalt permanent magnets at a lower temperature (less than 550°C)

Method used

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  • A kind of glass welding method of sintered samarium cobalt permanent magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Select two sintered samarium cobalt permanent magnets that have not been surface plating treatment, process them into 10×10×5mm blocks with wire cutting, sandblasting treatment on the welding surface, the compressed air pressure is 0.5MPa, the sand particles used are 1mm quartz sand, the surface distance between the nozzle and the samarium cobalt is 80mm, the spray angle is 30 °, and it is cleaned and dried with distilled water and acetone, respectively;

[0031] (2) The percentage of glass powder composition by weight is: PbO is 75%, B 2 O 3 10%, Bi 2 O 3 5%, ZnO 9%, SiO 2 0.5%, Al 2 O 3 0.5%. After weighing and mixing various raw materials according to the above ratios, they are placed in a V-type mixer and mixed evenly. The mixed raw materials are placed in the corundum crucible, heated to 800 ° C in the air atmosphere of the silicon carbon rod electric furnace, kept warm for 2 hours, poured into deionized water and quenched, dried, and crushed to below 300 mesh with...

Embodiment 2

[0035](1) Select two sintered samarium cobalt permanent magnets without surface plating treatment, process them into 10×10×5mm blocks with wire cutting, sandblast treatment on the welding surface, the compressed air pressure is 0.6MPa, the sand particles used are 1mm emery, the surface distance between the nozzle and samarium cobalt is 100mm, the spray angle is 40 °, and it is cleaned and dried with distilled water and acetone, respectively;

[0036] (2) The percentage of glass powder composition by weight is: PbO is 70%, B 2 O 3 8%, Bi 2 O 3 10%, ZnO 11.5%, SiO 2 0.3%, Al 2 O 3 0.2%. After weighing and mixing various raw materials according to the above ratios, they are placed in a V-type mixer and mixed evenly. The mixed raw materials are placed in the corundum crucible, heated to 850 ° C in the air atmosphere of the silicon carbon rod electric furnace, kept warm for 2.5 hours, poured into deionized water and quenched, dried, and ground with a ball mill to below 300 mesh. The gl...

Embodiment 3

[0040] (1) Select two sintered samarium cobalt permanent magnets that have not been surface electroplated, processed into 10×10×5mm blocks by wire cutting, sandblasting treatment on the welding surface, compressed air pressure of 0.8MPa, sand particles used for 0.5mm glass beads, nozzle and samarium cobalt surface distance of 110mm, spray angle of 50 °, respectively, with distilled water, acetone cleaning, drying;

[0041] (2) The percentage of glass powder composition by weight is: PbO is 65%, B 2 O 3 7%, Bi 2 O 3 15%, ZnO 12.5%, SiO 2 0.3%, Al 2 O 30.2%. After weighing and mixing various raw materials according to the above ratios, they are placed in a V-type mixer and mixed evenly. The homogeneous raw materials are placed in the corundum crucible, heated to 780 ° C in the air atmosphere of the silicon carbon rod electric furnace, kept warm, after 2.5 hours, poured into deionized water quenching, dried, and ball milled to below 300 mesh with a ball mill. The glass powder prepara...

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Abstract

The invention relates to a glass fusing method of sintered samarium cobalt permanent magnet. Select two sintered samarium cobalt permanent magnets without surface electroplating treatment, and process them into the desired shape; sandblast the welded surfaces of the two magnets respectively, clean them with distilled water and acetone in turn, and dry them; make glass powder into slurry Coating on the welding surface of a sintered samarium cobalt permanent magnet, after the coating layer is dry, put the welding surface of another sintered samarium cobalt permanent magnet on the coating layer; put the two magnets in a heat treatment furnace and heat to After the welding temperature is maintained for a certain period of time, the temperature is lowered to room temperature to complete the welding of the samarium cobalt permanent magnet; the welding temperature is lower than 550°C. The method proposed by the invention can quickly complete the welding of the sintered samarium cobalt permanent magnet in a short time at a temperature below 550° C., and the bending strength of the welded body is 80-90 MPa.

Description

Technical field [0001] The present invention belongs to the field of rare earth permanent magnet welding technology, particularly relates to a glass welding method of sintered samarium cobalt permanent magnet. Background [0002] 2:17 type samarium cobalt sintered permanent magnet material has high magnetic properties, has the characteristics of high Curie temperature (~830 °C), low temperature coefficient, and is an irreplaceable magnetic material for high temperature applications. In practical applications, it is necessary to weld magnets to meet the needs of special structural design, and the difficult solderability of sintered samarium cobalt magnets makes the connection problem between magnets become a bottleneck restricting their development. [0003] At present, epoxy resin is usually used to bond samarium cobalt permanent magnets, or mechanical means such as bolts are used to connect magnets. Epoxy resin aging occurs after long-term use, while samarium cobalt magnets are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C29/00C03C12/00C03C8/24
CPCC03C29/00C03C12/00C03C8/24
Inventor 方以坤于晓杰朱子斌肖涛刘海珍凌棚生韩伟董生智李卫
Owner CENT IRON & STEEL RES INST
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