Which among the following is the hardest cutting tool material?a)cerm...
Hardest Cutting Tool Material:
Cubic Boron Nitride (CBN):
- CBN is the hardest cutting tool material available.
- It is a synthetic material made from cubic boron nitride crystals.
- CBN tools are extremely hard and can withstand high temperatures, making them ideal for machining hard materials like hardened steels, cast irons, and superalloys.
- CBN tools have a longer tool life compared to other cutting tool materials.
Comparison with Other Materials:
- Cermets: Cermets are a combination of ceramic and metal and are known for their toughness and wear resistance. However, they are not as hard as CBN.
- High-Speed Steel (HSS): HSS is a common cutting tool material known for its versatility and ease of sharpening. However, it is softer than CBN and is not suitable for machining hard materials.
- Carbide: Carbide tools are widely used in machining applications due to their hardness and wear resistance. While carbide is harder than HSS, it is not as hard as CBN.
In conclusion, among the given options, Cubic Boron Nitride (CBN) stands out as the hardest cutting tool material, making it the preferred choice for machining operations where extreme hardness and wear resistance are required.