WANG Yanzhi ^{1, 3, 4}, ZHANG Wangxi ^{2, 3, 4}, SUN Changhong ^{2, 3, 4}, LIANG Baoyan ^{2, 3, 4}, LI Qiquan ^{2, 3, 4}, MU Yunchao ^{2, 3, 4}, SUN Yuzhou ^{3, 4, 5}
(1. School of Textiles, Zhongyuan University of Technology, Zhengzhou 451191, Henan, China; 2. School of Materials & Chemical
Engineering, Zhongyuan University of Technology, Zhengzhou 451191, Henan, China; 3. Henan Joint International Research
Laboratory of Diamond Engineering Technology, Zhengzhou 451191, Henan, China; 4. Henan Research Center on Diamond
Carbon Engineering Technology, Zhengzhou 451191, Henan, China; 5. School of Civil Engineering & Architecture,
Zhongyuan University of Technology, Zhengzhou 451191, Henan, China)

Abstract: Boron nitride materials, such as cubic boron nitride (cBN), hexagonal boron nitride (hBN) and polycrystalline cubic boron nitride (PcBN), are used in a variety of fields for their good properties like heat resistance and high hardness. The hBN has different products or morphologies, such as powders, fibers, nanometer materials, ceramics, films and so on. cBN can be synthesized by the approach of static high pressure and high temperature with the addition of catalytic agent in hBN, and has very high hardness only lower than that of diamond which has the best hardness in the world. PcBN used as cut tool materials matched with numerical control machine can be obtained by sintering of cBN and binding elements via an approach of static high pressure and high temperature. The preparing approaches, key properties and applications of various boron nitride materials including hBN, cBN, and PcBN, respectively, are mainly introduced. Some key research projects are suggested, for example, on relationships among hBN, cBN and PcBN, green production of hBN, synthesis of larger size cBN and high impact PcBN.

Key words: boron nitride; hexagonal boron nitride; cubic boron nitride, polycrystalline cubic boron nitride; super-hard materials