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FAQ
Why is there a 50% change in volume?
Carbide is a material made by compacting powder during sintering, and there are some gaps inside the carbide where air and particles collide.
Through sintering, the cobalt liquefies, and a 50% reduction in volume occurs when tungsten particles are attracted due to the capillary phenomenon. The contacting surfaces of different powdered particles try to mix and homogenize, inducing the atoms to move in an attempt to create new compounds.
Q&A in the same category in this question
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What are the weaknesses of cemented carbides?
Compared to general iron alloys, cemented carbide has lower toughness, which may cause chipping or peeling of the cutting edge.
In addition, as the relative density is about twice that of iron, the heavier weight of cemented carbide may be a disadvantage. -
Why does the amount of Co and WC particle size affect the thickness of the heat affected layer?
It is thought that when Co is in large quantities the fusing point is lowered, which increases the amount that melts and thickening the damaged layer.
It is also thought that when WC particle size is small, the material becomes easier to melt due to the volume effect, which thickens the damaged layer. -
Are there any changes due to thermal conductivity?
Thermal conductivity is based on the amount of Co. Lower Co levels lead to higher conductivity.
Generally, higher conductivity means that heat escapes well and frictional heat can be controlled.
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