cBN crystal in color from light to dark

Graphite-like hexagonal boron nitride (hBN) as raw materials in the growth of the participation of alkali metal out of the cBN. Pure cBN should be colorless, however, artificial growing out of cBN crystal often are colored, it is because the cBN crystal in the presence of different impurities. Currently, cBN crystals in color from light to dark can be roughly divided into colorless, orange, amber, dark amber and black. The most  cubic boron nitride  and black cBN crystals. Different colors of crystal has its own inherent nature of significant differences. With industrial development,  synthetic diamond  grades, especially high-grade cBN  Abrasive grinding . From the perspective of the development market in the world cBN, cBN demand every year more than 18% growth rate. Currently, the world's annual production of about 200 million karats cBN, with China accounting for half of the country, not only in quantity but also in quality are highly competitive.