The difference between tungsten carbide and CBN

Tungsten carbide and cubic boron nitride (CBN) are both materials commonly used in cutting tools and abrasives, but they have distinct properties and applications.

1. Composition:

  - Tungsten Carbide: Tungsten carbide is a composite material composed of tungsten and carbon atoms in equal parts. It is often mixed with a cobalt binder to enhance its toughness.

  - Cubic Boron Nitride (CBN): CBN is a synthetic material made from boron and nitrogen atoms arranged in a cubic crystalline structure. It is one of the hardest known materials, second only to diamond.

2.Hardness:

  - Tungsten Carbide: Tungsten carbide is extremely hard, with a Mohs hardness of around 9.

  - CBN: CBN is even harder than tungsten carbide, with a Mohs hardness of around 9.5.

3.Applications:

  - Tungsten Carbide: Tungsten carbide is commonly used in cutting tools, such as drills, end mills, and inserts, as well as in abrasives for grinding and machining applications. It is also used in wear-resistant parts and components.

  - CBN: CBN is primarily used in applications where high-speed machining or high temperatures are involved. It is especially well-suited for cutting hard materials like hardened steels, cast iron, and superalloys. CBN is often used in grinding wheels and abrasive tools for precision grinding operations.

4.Performance:

  - Tungsten Carbide: Tungsten carbide exhibits excellent wear resistance and toughness, making it suitable for a wide range of cutting and machining applications.

  - CBN: CBN offers superior thermal conductivity and chemical stability compared to tungsten carbide. It can withstand higher temperatures and maintain its cutting edge even under extreme conditions.

In summary, while tungsten carbide is widely used for its excellent wear resistance and toughness, CBN is preferred for applications requiring high cutting speeds, extreme hardness, and resistance to heat and chemical wear.