Method for measuring nitrogen content of rare earth permanent magnetic material neodymium-iron-boron alloy by using thermal conductivity method

A rare earth permanent magnet and NdFeB technology, which is applied in the field of measuring nitrogen content in rare earth permanent magnet material NdFeB alloy by thermal conductivity method, can solve the problem of no standard determination of nitrogen content, and achieve easy mastery and short operation process , low cost effect

Inactive Publication Date: 2015-03-25
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

To solve the problem of non-standard determination of the nitroge

Method used

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  • Method for measuring nitrogen content of rare earth permanent magnetic material neodymium-iron-boron alloy by using thermal conductivity method
  • Method for measuring nitrogen content of rare earth permanent magnetic material neodymium-iron-boron alloy by using thermal conductivity method
  • Method for measuring nitrogen content of rare earth permanent magnetic material neodymium-iron-boron alloy by using thermal conductivity method

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[0023] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0024] 1: Instruments and principles

[0025] Oxygen and nitrogen analyzer: American Lectra TC-600 oxygen and nitrogen analyzer or TC-500 oxygen and nitrogen analyzer.

[0026] The instrument uses helium or argon as the carrier gas. The sample is melted at a high temperature under an inert atmosphere in a graphite crucible. The nitrogen in the sample flows through the thermal conductivity cell. According to the thermal conductivity coefficient, the nitrogen content is detected and converted into The content of nitrogen in the tested sample.

[0027] 2: Reagent

[0028] Ether (analytical pure);

[0029] Carrier gas (high purity helium, purity greater than 99.999%);

[0030] Power gas (normal nitrogen);

[0031] Graphite crucible (requires good density and high purity of graphite)

[0032] Graphite powder

[0033] Nickel bladder

[...

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Abstract

The invention relates to a method for measuring the nitrogen content of a rare earth permanent magnetic material neodymium-iron-boron alloy by using a thermal conductivity method. The method comprises the following steps: putting a nickel bag containing graphite powder into an oxygen-nitrogen tester to measure peak and nitrogen results of nitrogen in the nickel bag; then putting a standard sample into the nickel bag, and compacting a seal of the nickel bag by using a wire stripper to measure the peak and nitrogen results of nitrogen; continuously measuring the standard sample for more than three times according to the method to obtain different measured values; clicking a calibration button of nitrogen in an instrument calibration page to ensure that an instrument performs calibration automatically and then a new calibration factor appears, and clicking a saving button to enter the next step; weighing a to-be-measured sample, putting the sample into the nickel bag, and compacting the seal of the nickel bag by using the wire stripper to measure the peak and nitrogen results of nitrogen, thereby obtaining an analysis result of nitrogen. Therefore, the accuracy is measured by comparing with the measurement of the standard sample.

Description

technical field [0001] The invention relates to the field of analysis of rare earth materials, in particular to a method for measuring nitrogen content in rare earth permanent magnet material neodymium-iron-boron alloy by using a thermal conductivity method. Background technique [0002] Relying on the advantages of rare earth resources and production costs, China has vigorously developed the NdFeB magnet industry and has become the world's largest producer and consumer. Due to the characteristics and cost performance of NdFeB magnets are superior to traditional magnetic materials, they have been widely used in various industries such as computers, motors, wind power generators, electric vehicles, instruments and meters, nuclear resonance imagers and aerospace navigators. It has huge potential application prospects in emerging technology fields such as maglev trains. [0003] Gas nitrogen content is one of the main indicators of the quality of NdFeB permanent magnet materia...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 李虹刘建华周春玲邹新萍王倩
Owner INNER MONGOLIA BAOTOU STEEL UNION
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