As you may have learned after reading the reviews above, carbide is a popular material integrated into circular saw blades. It is a hard material compound that resists wear and temperature differences. It is highly durable and unalterable. This non-corrosive material is also resistant to friction.
It is common for carbide to be integrated with another hard material like tungsten, resulting in a super metal alloy. Tungsten carbide blades are known for their clean and precise cuts of aluminum and other non-ferrous metals.
There are also blades made of diamond, which is one of the hardest materials on earth. Those blades are used for cutting asphalt, concrete, and other abrasive materials.