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FAQ
What are the effects of corrosion?
We checked a cemented carbide made 20 years ago, and verified 20 microns worth of corrosion.
Only the surface was corroded, so we were able to remove it by reprocessing it.
However, there are cases where some corrosion cannot be removed due to working environments, so we recommend regrinding if the corrosion is 0.1mm or greater. If storing after regrinding, ensure that all processing liquids have been removed and dried. Apply the carbide with rust preventive oil or paper, or cover in alumina powder.
Q&A in the same category in this question
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How do you store cemented carbide products?
For cemented carbide materials:
Storing at room temperature is fine. (Less than 300 in Celsius, as cobalt oxidizes at that temperature)
Humidity will leads to rusting, so we recommend storing the materials in an area with low humidity.
For complete metal molds:
Cemented Carbide corrosion can occur from grinding fluid, lubricating liquid, or other liquids.
If the grinding or lapping surface is not stored properly, corrosion may occur.
Store using a rust preventive oil or paper. -
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. -
What causes cemented carbide to crack?
Compared to metal materials, cemented carbide materials have a different thermal expansion coefficient. For this reason, cracks may occur in shrink/cooling-fitted products when the operating temperature is significantly higher (lower) than the designed value. When using cemented carbides with high hardness, problems such as cracking may occur by high impact, so the required fracture toughness value should also be carefully considered.
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