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Method of measuring thickness of Nd-Fe-B alloy coating

A technology of alloy coating and measurement method, which is applied in measuring devices, instruments, and material analysis through electromagnetic means, can solve the problems of loss of magnetic properties, etc., and achieve the effects of high accuracy, easy operation, and simple method

Inactive Publication Date: 2017-06-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

A certain thickness of the coating can protect the magnet from corrosion, but too thick a coating will also produce a shielding effect and lose magnetic properties

Method used

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  • Method of measuring thickness of Nd-Fe-B alloy coating
  • Method of measuring thickness of Nd-Fe-B alloy coating
  • Method of measuring thickness of Nd-Fe-B alloy coating

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Embodiment Construction

[0023] A method for measuring the thickness of an NdFeB magnet coating sample, comprising the steps of:

[0024] (1) Wash the surface of the coating with absolute ethanol, and dry it with nitrogen. Glow discharge mass spectrometry (GD-MS) was used to qualitatively measure all elements of the magnet coating sample, and it was roughly determined that the coating type was Ni-Cu-Ni-Cu-Ni composite coating;

[0025] (2) Adjust the GD-MS instrument discharge current to 20mA, discharge gas (Ar) flow rate to 400mL / min, and adopt corresponding lens parameters for each coating, as shown in Table 1;

[0026] Under the above-mentioned instrument conditions, carry out uninterrupted sputtering (i.e. measurement) on the magnet coating, and collect data once every 15 seconds until the content of Fe element rises linearly, indicating that the coating has been broken down, and the test is completed;

[0027] (3) Use the obtained data to draw the element mass fraction-sputtering time distributi...

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Abstract

The invention relates to a method of measuring the thickness of an Nd-Fe-B alloy coating, which belongs to the technical field of coating detection. Absolute ethanol is used for cleaning the surface of the Nd-Fe-B alloy coating, and a nitrogen gas is used for drying; glow discharge mass spectrometry (GD-MS) is adopted to carry out all-element qualitative measurement on the alloy coating, and the coating type is judged; the discharge current of a GD-MS instrument is adjusted to be 20 mA, the discharge gas Ar flow is 400 mL / min, and corresponding lens parameters are adopted for each coating; uninterrupted sputtering is carried out on the alloy coating, data are collected for one time at each 15 seconds until a Fe element content rises straightly, and sputtering is stopped; the obtained data are used for drawing an element mass fraction-sputtering time distribution map, a boundary point in each layer is found out on the map, and the sputtering time in each coating layer is obtained; and according to the sputtering rate and the sputtering time of each layer, the thickness of each coating is calculated, the method is simple and easy to operate, and the accuracy is high.

Description

technical field [0001] The invention relates to a method for measuring the thickness of an NdFeB alloy coating, in particular to a method for measuring the thickness of a Ni-Cu-Ni-Cu-Ni coating of an NdFeB magnet, and belongs to the technical field of coating detection. Background technique [0002] NdFeB materials have excellent characteristics such as high magnetic energy product, high remanence, high coercive force, high Curie temperature, and easy machining. They are mainly used to make motors and have been widely used in computers, medical equipment, communication devices, electronic devices, Magnetic machinery, automobiles and other fields. Sintered NdFeB permanent magnets are easy to corrode. In order to ensure the service life, sintered NdFeB permanent magnets must undergo surface coating treatment. A certain thickness of the coating can protect the magnet from corrosion, but too thick a coating will also produce a shielding effect and lose magnetic properties. Ni-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/02G01N27/68
CPCG01B15/02G01N27/68
Inventor 刘鹏宇聂帅田佳刘兵李娜
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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