Defect Types of Tungsten Contacts- I

Defect types of tungsten contacts described as follows:

1. Porous holes, pores
This defect type is common in powder metallurgy to prepare tungsten contacts. This may be because:
Uneven particle size of tungsten powder;
The gas content of tungsten powder is relatively large;
Insufficient pressure when mixing powder;
Insufficient infiltration, when you are sintering the porous tungsten skeleton.

2. Unevenly distributed organization
Reason: Because of the existence of added element, it makes the added element or poor oxide in grain boundaries aggregated.

3. Inclusions
Under normal circumstances, the presence of inclusions in the tungsten contacts may be due to: non-metallic inclusions mixed in them and other foreign metal inclusions mixed with.

4. Bubbles
Because there are small holes in tungsten ingot itself, and the phenomenon of inner oxide will appear when pressing, crushed holes will expand to form bubbles.

5. Delaminating cracks
Because tungsten ingot itself has already gathered micro cracks, during the oxidation process, because stress makes delaminating of the cracks.

 

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