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Thermal oxidation-resistant neodymium iron boron composite magnetic powder and preparation method thereof and application

A neodymium-iron-boron powder and neodymium-iron-boron technology are applied in the field of thermal oxidation-resistant neodymium-iron-boron composite magnetic powder and its preparation, which can solve the problem of easy oxidation, poor corrosion resistance and poor oxidation resistance of neodymium-iron-boron alloys, and reduced product Stability and reliability issues, to achieve the effect of uniform dispersion

Inactive Publication Date: 2019-12-13
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The rare earth element neodymium in the NdFeB alloy is active in nature, which makes the corrosion resistance and oxidation resistance of the entire NdFeB alloy very poor, especially under high temperature conditions, it is more prone to oxidation, which seriously affects the NdFeB permanent magnet. service life, reducing the stability and reliability of the product

Method used

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  • Thermal oxidation-resistant neodymium iron boron composite magnetic powder and preparation method thereof and application
  • Thermal oxidation-resistant neodymium iron boron composite magnetic powder and preparation method thereof and application
  • Thermal oxidation-resistant neodymium iron boron composite magnetic powder and preparation method thereof and application

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preparation example Construction

[0027] In the present invention, when the surface modification method is phosphating modification, the preparation method of the surface-modified NdFeB micropowder preferably includes: performing phosphating treatment on the NdFeB powder raw material by spraying to obtain NdFeB surface modified micropowder, that is, phosphating micropowder. The present invention has no special requirements on the source of the raw materials of the NdFeB powder, and it is prepared by using commercially available products or methods well known to those skilled in the art; in the embodiments of the present invention, the The NdFeB powder raw material is preferably obtained by pulverizing NdFeB flakes. In the present invention, the particle size of the NdFeB powder raw material is preferably 0.1-200 μm, more preferably 0.5-180 μm.

[0028] In the present invention, in terms of mass volume concentration, the spray phosphating solution preferably includes 10-25 g / L water-soluble acrylic acid, 1-5 g...

Embodiment 1

[0049] A heat-oxidation-resistant NdFeB composite micropowder comprises NdFeB powder and polytetrafluoroethylene powder, wherein the mass ratio of the NdFeB powder to the polytetrafluoroethylene powder is 91:9.

[0050] The neodymium iron boron powder is phosphating micropowder, specifically prepared as follows:

[0051] Under an inert atmosphere, the phosphating solution (in terms of mass volume concentration, including 10 g / L water-soluble acrylic acid, 5 g / L potassium molybdate, 38 g / L potassium phosphate and 5 g / L fluorinated Potassium) for gas atomization (atomization speed is 5000r / min) to obtain atomized liquid; then spray the atomized liquid onto the NdFeB raw material to realize phosphating; during the spraying process, the temperature is controlled at 30°C.

[0052] After phosphating of NdFeB powder, the magnetic properties are significantly improved. Before phosphating, the Hc(Oe), Ms(emu / g) and Mr(emu / g) of NdFeB powder are 9591, 115.1 and 85.2 respectively; After...

Embodiment 2

[0056] Prepare thermal oxidation-resistant NdFeB composite fine powder according to the method of Example 1, the difference is that it also contains samarium cobalt magnetic powder, the particle size of the samarium cobalt magnetic powder is in the range of 50-80 μm, and the mass is 5% of the mass of the neodymium iron boron powder.

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Abstract

The invention provides thermal oxidation-resistant neodymium iron boron composite micro powder and a preparation method thereof and application, which belong to the technical field of preparation of permanent magnet material powder. The thermal oxidation-resistant neodymium iron boron composite micro powder provided by the invention comprises neodymium iron boron powder and polytetrafluoroethylenepowder, and the mass ratio of the neodymium iron boron powder to the polytetrafluoroethylene powder is (90-95) to (5-10). Data of the embodiment show that the composite micro powder provided by the invention has no obvious change under the condition of 200 DEG C or below, and the change amplitude is obviously lower than that of a neodymium iron boron powder raw material even under the high-temperature condition of 300-450 DEG C, and the thermal oxidation resistance of the neodymium iron boron composite micro powder provided by the invention is shown to be obviously improved. According to thepreparation method for the thermal oxidation-resistant neodymium iron boron composite micro powder, a multi-path airflow powder blowing and mixing mode is adopted, multiple components can be evenly mixed and evenly dispersed, and then the performance of all the components can be brought into play easily.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet powder preparation, and in particular relates to a thermal oxidation-resistant NdFeB composite magnetic powder, a preparation method and application thereof. Background technique [0002] Neodymium iron boron (NdFeB) permanent magnet materials are mainly made of rare earth metals such as neodymium Nd, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The magnet prepared by mixing and granulating magnetic powder, polymer binder and various processing aids in a certain proportion, and then injecting the granules through an injection molding machine at an appropriate temperature is called injection molding. magnet. Injection magnets not only have excellent magnetic properties, but...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0552H01F41/026
Inventor 刘荣明耿赵文熊君张康胡国辉黄可淼李志宏贾立颖王倩李炳山
Owner BGRIMM TECH CO LTD
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