Method for measuring hydrogen content in neodymium, iron, boron and rare earth permanent magnetic alloy material with thermal conductivity method

A rare earth permanent magnet, NdFeB technology, applied in the direction of thermal conductivity of materials, etc., can solve the problem of no standard determination method for hydrogen content determination, and achieve the effects of easy to master, short operation process and stable method

Inactive Publication Date: 2015-03-11
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
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Problems solved by technology

To solve the problem that there is no standard method for the determination of the hydrogen content in the rare earth permanent magnet material NdFeB alloy

Method used

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  • Method for measuring hydrogen content in neodymium, iron, boron and rare earth permanent magnetic alloy material with thermal conductivity method

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Embodiment Construction

[0013] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0014] 1: Instrument and principle

[0015] Hydrogen analyzer: American Lectra RH-402.

[0016] The sample is put into a nickel capsule, put into a quartz crucible under the protection of nitrogen, and heated by electromagnetic induction. The oxygen in the sample exists in the form of carbon monoxide and carbon dioxide. The carbon monoxide is converted into carbon dioxide by the Schutz reagent, and then alkaline Absorbent absorbs. Hydrogen and part of nitrogen are released in the form of gas, and hydrogen enters the thermal conductivity detector, which is converted into hydrogen content in ppm (ug / g) after detection by thermal conductivity.

[0017] 2: Reagent

[0018] Diethyl ether (analytical pure)

[0019] Carrier gas (high-purity nitrogen, purity greater than 99.999%)

[0020] Quartz crucible

[...

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Abstract

The invention relates to a method for measuring hydrogen content in a neodymium, iron, boron and rare earth permanent magnetic alloy material with a thermal conductivity method. A quartz crucible provided with a nickel bag is placed in a hydrogen measuring instrument, a hydrogen peak and a hydrogen result of the nickel bag are measured, a standard sample is placed in the nickel bag, the hydrogen peak and the hydrogen result of the standard sample are measured, the standard sample is continuously measured for more than three times with the method, different measuring values can be obtained, the instrument automatically performs calibration when hydrogen calibration in instrument page calibrations is clicked, a new calibration coefficient can appear at the moment, save is clicked, a to-be-measured sample is weighed and put in the nickel bag, the hydrogen peak and the hydrogen result are measured, the analysis result of hydrogen can be obtained and is compared with standard sample measurement, and the measurement accuracy is high.

Description

technical field [0001] The invention relates to the field of rare earth material analysis, in particular to a method for measuring the hydrogen content in rare earth permanent magnet material neodymium-iron-boron alloy by using a thermal conductivity method. Background technique [0002] The chemical properties of NdFeB magnets are lively, and the functional use of the device is affected due to its easy oxidation. At present, methods such as electroplating, electroless plating, phosphating and electrophoresis are commonly used to solve its corrosion resistance problems. Since the material also has hydrogen storage properties, it has a strong hydrogen absorption capacity, and the hydrogen absorption of the substrate will reduce or completely lose the function of the permanent magnet functional device. Therefore, the hydrogen content of the magnet must be detected during the pre-treatment process of electroplating and in the process of electroplating or electroless plating, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/18
Inventor 李虹刘建华周春玲邹新萍王倩
Owner INNER MONGOLIA BAOTOU STEEL UNION
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