The hardness of tungsten wire is one of the important indicators to measure its performance, which can usually be measured by the following methods:
- Brinell hardness test
Principle: The Brinell hardness test is to determine the hardness value by pressing a steel ball into the surface of the tungsten wire and then measuring the diameter of the indentation. This method is suitable for measuring softer metals and larger specimens.
Features: Simple operation and intuitive results, but greatly affected by material thickness and surface state.
- Vickers hardness test
Principle: The Vickers hardness test uses a diamond indenter to apply pressure on the surface of the tungsten wire and then measures the diagonal length of the indentation to calculate the hardness. This method has high accuracy and repeatability and is suitable for accurate measurement of tungsten wire hardness.
Features: Suitable for smaller specimens and measurement occasions requiring high precision.
- Rockwell hardness test
Principle: The Rockwell hardness test is to determine the hardness value by applying a certain pressure on the surface of the tungsten wire through a diamond cone indenter and measuring the depth of the indentation. This method has the characteristics of fast measurement speed and wide application range.
Features: In some cases, it may be affected by the material structure, but it is generally a fast and effective hardness measurement method.
- Microhardness test
For more precise measurements, a microhardness tester can be used to test the microhardness of tungsten wire. This method is usually used to measure small-sized specimens or where high-resolution measurements are required.
- Measurement precautions
Sample preparation: Before performing a hardness test, ensure that the surface of the tungsten wire sample is clean, free of oil and impurities. These contaminants may affect the accuracy and repeatability of the test results.
Test environment: Temperature and humidity have a certain impact on the results of tungsten wire hardness tests. Therefore, the temperature and humidity of the test environment should be controlled during the test to ensure the stability of the test results.
Operation specification: When performing a tungsten wire hardness test, the operation should be strictly followed to avoid errors caused by improper operation. At the same time, the test instrument should be regularly maintained and calibrated to ensure its stable and reliable performance.
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