Introduction and Characteristics of Superhard Material CBN

Superhard materials mainly refer to diamond and cubic boron nitride (CBN), which are known as the hardest materials in the world. CBN has high hardness, thermal stability, chemical inertness, good infrared permeability, wide band gap width and other excellent properties. It has large chemical stability for ferrious material, and not only is able to process difficult machining materials, increase the productivity, but also can effectively improve the surface quality of workpieces. The contribution on metal processing leads to revolutionary changes in grinding and cutting fields.

CBN materials are new superhard materials gained by using synthetic methods. Compared with hard materials and other superhard materials, CBN has the following features:

High hardness: The hardness of CBN materials is second only to that of diamond, far higher than corundum and silicon carbide, and its toughness is better than that of diamond, processing range and ability more stronger.

High temperature resistant and strong chemical inertness: Diamond and iron will have carbonization reaction at high temperature, so it is not suitable for processing iron group metals and their alloys; The characteristics of CBN and chemical inertness make it have significant advantages in terms of processing ferrous metals.

Good thermal conductivity: The thermal conductivity of CBN materials rises with the temperature of machined parts increasing. Good heat conductivity can make the heat produced in the process of processing dissipating fast, which will help lower processing temperature, and effectively reduce tool wear.

Good grinding performance: CBN particles can stay sharp for a long time. In the batch processing, the workpiece always can get higher shape, accuracy and consistency, and the processing surface quality is really improved.

High resistance to wear: The abrasion resistance of CBN materials is higher than common materials, which can reduce the number of replacing and finishing grinding tools in the processing, and improve the processing efficiency.