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FAQ
What is the main component of cemented carbide?
The main component is tungsten carbide (WC), which becomes cemented carbide after bonding with metallic binders such as cobalt and nickel.
Additives such as chromium (Cr) are added to these alloys to create cemented carbides with various characteristics.
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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 kind of cemented carbide is used as cutting tools?
The material of cemented carbide to be selected depends on the workpiece and its thickness, etc. In general, for use as a cutting tool, ultrafine grain cemented carbide, which consists of ultrafine tungsten carbide (WC) particles, is often selected to increase cutting ability and to prevent chipping.
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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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