Detecting defects in tungsten wire usually involves multiple aspects, including chemical composition, mechanical properties, microstructure, surface quality and resistivity. The following are some commonly used detection methods:
- Chemical composition analysis
Use X-ray fluorescence spectrometer (XRF) or energy dispersive X-ray spectrometer (EDX) for quantitative analysis of chemical composition to ensure that the tungsten content and the proportion of other element components in the tungsten wire meet the relevant standards.
- Mechanical property test
Tensile strength test: Use a universal material testing machine to perform tensile tests to evaluate the mechanical properties of tungsten wire under different environments.
Elongation and hardness test: Through specific test methods, measure the elongation and hardness value of tungsten wire during the stretching process to determine the quality of its mechanical properties.
- Microstructure analysis
Microscope observation: Use a scanning electron microscope (SEM) to observe the microstructure and surface state of tungsten wire, including grain structure, defects, etc.
Metallurgical microscope observation: Used to observe the metallographic structure of tungsten wire to provide support for microstructure analysis.
- Surface quality inspection
Appearance inspection: Check whether the color of the tungsten wire surface is bright silver-gray, and whether there are defects such as cracks and oxide layers.
Dimension measurement: Use tools such as vernier calipers to measure the size of the tungsten wire to ensure that it meets the design requirements.
Brittleness test: Use tensile tests and other methods to test the tensile resistance and mechanical strength of the tungsten wire to determine whether it has brittle defects.
- Resistivity test
The four-probe method is used to accurately measure the resistivity of the tungsten wire, evaluate its conductive properties, and ensure its effectiveness in electrical applications.
- Other special tests
Thermal conductivity test: Evaluate the thermal conductivity of tungsten wire.
Creep test: Load for a long time at high temperature and observe the deformation of tungsten wire.
Wire winding performance test: Test the performance of tungsten wire when it is wound into a spiral or other shape.
Deflection test: Measure the degree of bending of tungsten wire when subjected to external force.
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