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FAQ
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.
Q&A in the same category in this question
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What is the difference between cemented carbide and ceramics?
The hardness of ceramics approaches that of diamond, the hardest mineral on earth. If the hardness of diamond is 10, ceramics exhibit a hardness of 9 or higher, which is harder than tungsten and other hard metals. The difference in composition also results in a heavier weight in the case of cemented carbides. However, cemented carbides can be made with various characteristics depending on tungsten carbide (WC) particle size, the amount of bonding material, and additives, so it is possible to select the most suitable grade for the application from a wide range of available grades.
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What is the relationship between hardness and strength?
Hardness affects resistance to abrasion, and harder the material the more resistant it is to abrasion.
However, amount of abrasion is not only determined by hardness, but could be affected by adhesions caused by workpieces of certain materials.
Thickness also affects the life of material, and so the environment and manufacturing process must be taken into consideration when selecting cemented carbide grade.
There are many factors related to strength, such as transverse rupture strength, impact strength, fracture toughness value and others, therefore material selection must be made in consideration of these factors. -
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.
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