Research Status and Application of Cubic Boron Nitride

Cubic boron nitride is thought that does not exist in nature for a long period of time. Until 2009, scientists from Lawrence Livermore National Laboratory in the University of California with peers from research institutions in China and Germany, found the mineral within the rich chromium rock from the ancient oceanic crust in China southern Qinghai-Tibet plateau mountainous area, which formed the crystals under the condition of around 1300 ℃ high temperature and 118430 atmospheres of high pressure.

The team named the new mineral qingsongite (the suffix: ite refers the mineral) with the professor Qingsong Fang's name in institute of Geology, Chinese Academy of Sciences. International Mineralogical Association (IMA) formally acknowledged that this is a new mineral-cubic boron nitride in August, 2013. The atomic structure of cubic boron nitride is similar to the carbon atoms structure of diamond, so it has the characteristics of high density, whose hardness is comparable with that of diamond and is often used as abrasive and tool materials.

Great performance of cubic boron nitride is mainly manifested in the following respects:

A. The chemical inertness of cubic boron nitride is better than that of diamond: the hardness of cubic boron nitride is second only to that of diamond, but its chemical inertness is more better than that of diamond; it does not react with iron-group metals and their alloys, and its oxidation resistance is far better than that of diamond.

B. Cubic boron nitride is more resistant to high temperature.

C. Its conversion rate is higher and the cost is lower, so it has better performance.

D. It is less affected by the size, shape and size.

At present, there are many scholars to study it for the superior properties of cubic boron nitride. Baoyan Liang and other scholars use Al/C/TiO₂/CBN (CBN mass fraction is 10% in groups of powder) powder as the raw material to make the Al/TiC/Al₂O₃ ceramic metal composite binder cubic boron nitride (CBN) materials by in-situ reaction sintering technology.

In 2004, Benko used cubic boron nitride (ABN-300) and Ti₃SiC₂ as the raw material to make Ti₃SiC₂ - cubic boron nitride (CBN) composite materials under the pressure of 7GPa, and they researched the microstructure and properties of the new superhard composite materials.

The cubic boron nitride abrasive products are widely used in geological exploration, stone materials, machinery, automobile, defense industry and other fields, which have formed a series products and are complete in specifications. Cubic boron nitride abrasive products have great grinding performance, which are not only qualified for grinding hard materials processing, improve the productivity, and strictly control the shape and size precision of the workpieces, but also can effectively improve the grinding quality of workpieces, improve the surface integrity after grinding of workpieces. Thus, it increases the fatigue strength of the parts, prolongs the service life, increases its reliability but decreases energy consumption and environmental pollution in the cubic boron nitride abrasive production process, compared with ordinary abrasive production. Therefore, expanding the production and application of cubic boron nitride abrasive products is the inevitable trend in the development of mechanical industry.

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