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Neodymium iron boron magnetic material strong in corrosion resistance

A technology of anti-corrosion and magnetic materials, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of surface damage of magnets, poor corrosion resistance, etc. Improve the effect of corrosion resistance

Inactive Publication Date: 2014-03-05
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the sintering of NdFeB magnets at this stage. Specifically, NdFeB materials sintered by traditional processes have poor corrosion resistance due to their own chemical properties and must be treated by coating. On the one hand, it may cause damage to the surface of the magnet. On the other hand, the corrosion resistance of NdFeB materials is only determined by the quality of the coating, and the situation of poor corrosion resistance cannot be fundamentally changed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A NdFeB magnetic material with strong corrosion resistance, which is formed by mixing a main phase alloy and an auxiliary phase alloy; the main phase alloy is configured by weight percentage of the following raw materials: 64.5% iron, 1.2% boron, Neodymium 34.1%, vanadium 0.1%, aluminum 0.1%; auxiliary phase alloy is prepared from the following raw materials by weight percentage: iron 53.8%, boron 1.2%, neodymium 19.5%, tantalum 14.3%, dysprosium 10.2%, nickel 1.0%.

[0065] In the above scheme, the aluminum in the main phase alloy can improve the wettability of the liquid phase and the main phase during the sintering process, making the grain surface smoother, and can refine the grains of the main phase, thereby improving the magnetic properties; and vanadium through The structure and grain of the magnet are refined, and the grain coarsening temperature is increased, thereby increasing the fracture strength and bending strength of the magnet. In the auxiliary phase all...

Embodiment 2

[0123] A NdFeB magnetic material with strong corrosion resistance, which is formed by mixing a main phase alloy and an auxiliary phase alloy; the main phase alloy is configured by weight percentage of the following raw materials: 68.2% iron, 1.2% boron, Neodymium 30.2%, vanadium 0.2%, aluminum 0.2%; auxiliary phase alloy is prepared by the following raw materials by weight percentage: iron 54.2%, boron 0.8%, neodymium 20.2%, tantalum 13.4%, dysprosium 10.6%, nickel 0.8%.

[0124] In the above scheme, the aluminum in the main phase alloy can improve the wettability of the liquid phase and the main phase during the sintering process, making the grain surface smoother, and can refine the grains of the main phase, thereby improving the magnetic properties; and vanadium through The structure and grain of the magnet are refined, and the grain coarsening temperature is increased, thereby increasing the fracture strength and bending strength of the magnet. In the auxiliary phase alloy...

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Abstract

The invention relates to a neodymium iron boron magnetic material strong in corrosion resistance. The neodymium iron boron magnetic material strong in corrosion resistance is formed by a main-phase alloy and a secondary-phase alloy through mixing. The main-phase alloy comprises, by weight, 64.5-68.5% of iron, 1.0-1.2% of boron, 30.2-34.3% of neodymium, 0.05-0.4% of vanadium and 0.1-0.4% of aluminum. The secondary-phase alloy comprises, by weight, 50.8-54.2% of iron, 0.8-1.2% of boron, 18.9-21.1% of neodymium, 12.8-16.3% of tantalum, 8.9-11.1% of dysprosium and 0.8-1.2% of nickel. The neodymium iron boron magnetic material prepared with the method is excellent in corrosion resistance.

Description

technical field [0001] The invention relates to a magnetic material and a production process thereof, in particular to a strong corrosion-resistant NdFeB magnetic material and a production process thereof. Background technique [0002] NdFeB magnetic materials, as the latest result of the development of rare earth permanent magnet materials, are widely used due to their excellent magnetic properties. However, there are still many deficiencies in the sintering of NdFeB magnets at this stage. Specifically, NdFeB materials sintered by traditional processes have poor corrosion resistance due to their own chemical properties and must be treated by coating. On the one hand, it may cause damage to the surface of the magnet, on the other hand, the corrosion resistance of the NdFeB material is only determined by the quality of the coating, and its poor corrosion resistance cannot be fundamentally changed. Contents of the invention [0003] The technical problem to be solved by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057C22C38/12C22C33/02
Inventor 苏广春关井和陈益明
Owner NINGBO STAR MATERIALS HI TECH
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