Plasma-sprayed ceramic layer on neodymium-iron-boron permanent magnet material surface and preparation method of plasma-sprayed ceramic layer

A technology of surface plasma and permanent magnet materials, applied in metal material coating process, permanent magnet manufacturing, coating, etc., can solve problems such as low film formation rate, battery intergranular corrosion, protective layer foaming, etc., and achieve rapid The effect of preparation

Active Publication Date: 2017-10-17
GUILIN UNIV OF ELECTRONIC TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The structure is loose and porous, and the potential difference between the phases is large. It is easy to form a primary battery in a warm environment and cause serious intergranular corrosion, which seriously affects the performance and life of NdFeB permanent magnet materials.
[0003] At present, the most common NdFeB surface protection technologies are electroplating and electroless plating. However, electroplating and electroless plating are used to prepare a protective layer on the surface of the NdFeB substrate. The surface conditioning treatment and plating process will cause liquid substances to enter the substrate. As for the failure phenomena such as blistering and peeling inside the protective layer during later use
At the same time, the electroplating process also has certain environmental costs.
[0004] Physical vapor deposition technology is a new technology applied to the surface protection of NdFeB permanent magnet materials in recent years. This technology can well avoid the shortcomings of electroplating and electroless plating processes, but the film formation rate of this technology is not high and cannot achieve high quality. Rapid Preparation of Protective Coatings

Method used

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  • Plasma-sprayed ceramic layer on neodymium-iron-boron permanent magnet material surface and preparation method of plasma-sprayed ceramic layer
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  • Plasma-sprayed ceramic layer on neodymium-iron-boron permanent magnet material surface and preparation method of plasma-sprayed ceramic layer

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preparation example Construction

[0037] The present invention also provides a method for preparing a plasma-sprayed ceramic layer on the surface of an NdFeB permanent magnet material comprising the following steps:

[0038] Step 1, pretreating the NdFeB substrate 1: shaping the substrate, sandblasting to remove attachments on the surface of the substrate, and cleaning the roughened surface with high-pressure dry gas;

[0039] Step 2, preheating the pretreated NdFeB substrate 1 in a vacuum environment, the preheating temperature is 90-125° C., and the time is 8-10 minutes;

[0040] Step 3, preparing a Ni-Al alloy layer transition layer 2 on the surface of the preheated NdFeB substrate by plasma spraying;

[0041] Step 4, prepare a layer of Al on the surface of the transition layer 2 of the Ni-Al alloy layer by plasma spraying 2 o 3 -TiO 2 Composite ceramic layer 3.

[0042] In step one, the NdFeB substrate 1 is pretreated: the substrate is shaped, the attachments on the substrate surface are removed by san...

Embodiment 1

[0052] The preparation of the plasma-sprayed ceramic layer on the surface of the above-mentioned NdFeB permanent magnet material comprises the following steps:

[0053] Step 1: chamfering, degreasing and sandblasting the NdFeB substrate 1 until the gray-white fresh surface of the NdFeB substrate is exposed. The sandblasting parameters are: the sand material is brown corundum, the particle size is 22#, the compressed dry air pressure is 0.5MPa, the sandblasting distance is 65mm, and the sandblasting angle is 70°. The roughened surface is then surface-cleaned with high-pressure dry gas to prevent sand or loose NdFeB particles from being embedded in the matrix.

[0054] Step 2, heat the pretreated NdFeB substrate 1 in a vacuum environment at 90° C. for 10 minutes.

[0055] Step 3, using plasma spraying technology to prepare a layer of 26 μm self-adhesive primer layer (Ni-Al alloy layer transition layer 2) on the surface of the preheated NdFeB substrate 1 . Spraying parameters a...

Embodiment 2

[0059] The preparation of the plasma-sprayed ceramic layer on the surface of the above-mentioned NdFeB permanent magnet material comprises the following steps:

[0060] Step 1: chamfering, degreasing and sandblasting the NdFeB substrate 1 until the gray-white fresh surface of the NdFeB substrate is exposed. The sandblasting parameters are: the sand material is brown corundum, the particle size is 22#, the compressed dry air pressure is 0.5MPa, the sandblasting distance is 65mm, and the sandblasting angle is 70°. The roughened surface is then surface-cleaned with high-pressure dry gas to prevent sand or loose NdFeB particles from being embedded in the matrix.

[0061] Step 2, heat the pretreated NdFeB substrate 1 in a vacuum environment at 110° C. for 9 minutes.

[0062] Step 3, using plasma spraying technology to prepare a layer of 28 μm self-adhesive primer layer (Ni-Al alloy layer transition layer 2) on the surface of the preheated NdFeB substrate 1 . Spraying parameters a...

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Abstract

The invention discloses a plasma-sprayed ceramic layer on a neodymium-iron-boron permanent magnet material surface capable of avoiding the failure phenomena, such as foaming in a protective layer of the neodymium-iron-boron permanent magnet material surface and peeling of the protective layer and a preparation method of the plasma-sprayed ceramic layer. The plasma-sprayed ceramic layer on the neodymium-iron-boron permanent magnet material surface comprises a neodymium-iron-boron machine body, an Al2O3-TiO2 composite ceramic layer and a Ni-Al alloy layer transition layer. The preparation method comprises the steps of (1) pretreating a neodymium-iron-boron matrix; (2) carrying out preheating treatment on the pretreated neodymium-iron-boron matrix in a vacuum environment; (3) preparing the Ni-Al alloy layer transition layer on the surface of the preheated neodymium-iron-boron matrix by adopting plasma spraying; and (4) preparing the Al2O3-TiO2 composite ceramic layer on the surface of the Ni-Al alloy layer transition layer by adopting plasma spraying. According to the plasma-sprayed ceramic layer of the neodymium-iron-boron permanent magnet material surface and the preparation method of the plasma-sprayed ceramic layer, rapid preparation of the high-quality protective layer on the neodymium-iron-boron permanent magnet material surface can be achieved, no by-product exists in the preparation process, and the plasma-sprayed ceramic layer is green, clean and free of pollution.

Description

technical field [0001] The invention relates to the technical field of surface corrosion and protection treatment, in particular to a plasma sprayed ceramic layer on the surface of an NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] Known: As the third generation rare earth permanent magnet material, NdFeB permanent magnet material is widely used in electronic Communications, metallurgical manufacturing, geological exploration, medical care, transportation and aerospace, and other fields. However, since the magnet is a multiphase alloy composed of the main phase Nd2Fe14B, the boron-rich phase Nd1+εFe4B4 and the neodymium-rich phase, the processing technology is powder metallurgy or sintering. The structure is loose and porous, and the potential difference between the phases is large. It is easy to form a primary battery in a warm environment and cause serious intergranular corrosion, which seriously affects the performance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/08H01F41/02
CPCH01F41/026C23C4/08C23C4/11C23C4/134
Inventor 徐晋勇赵钦浩唐焱罗奕张应红张斌孙宁高鹏陈金龙高成高波王岩莫愁黄伟莫荣胡清钟
Owner GUILIN UNIV OF ELECTRONIC TECH
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