The Metallographic Inspection Processes of Tungsten Contacts

The metallographic inspection processes of tungsten contacts:

1. Sampling
This step is necessary to consider the characteristics and processing aspects of tungsten contacts material, and then select the location and test surface of the appropriate and representative sampling.

2. Inlaying
If the shape of the contacts material is irregular or size is not big enough, then you need to insert or holder for easy operation.

3. Coarse grinding
The purpose: to make contacts sample flat and approximately ground to a suitable shape. If it is general steel material, then you need to coarse grinding on the grinder kibble, if it is only relatively soft material, then you can use a file to polish specimens.

4. Finish grinding
The purpose: To eliminate the deep scratches of the contacts material left by coarse grinding, and make it ready for polishing. General material grinding methods can be divided into mechanical grinding and manual grinding.

5. Polishing
The purpose: This is to remove the fine cracks left by finish grinding and to make its surface as bright as a mirror, and no trace. Polishing generally is divided into chemical polishing, electrolytic polishing and mechanical polishing, among which the most commonly used is mechanical polishing.

6. Corroding
You must first carry out corroding process of contacts material so that polishing contacts can be observed under a microscope. Metallographic corroding methods include electrolysis corrosion, chemical corrosion and constant potential corrosion, among which the most commonly used, is chemical corrosion.



 

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