Yanshan University synthetic hardness super diamond material

It is reported that Yanshan University has successfully synthesized a new nanostructured cubic boron nitride material. This material has many excellent features and is expected to become a new generation of tool materials widely used in the steel industry in the future.

According to the relevant person in charge of the Department of Science and Technology of the Hebei Provincial Department of Education, Chinese and foreign scientists led by Prof. Tian Yongjun of the State Key Laboratory of Metastable Materials Preparation Technology and Science of Yanshan University, with the continuous financial support of the natural sciences, have similar Russian matryoshka crystal structure. The boron nitride nano-particles are the starting materials, and the new material of cubic boron nitride nanostructures has been successfully synthesized by high-temperature and high-pressure technology.

This new material has many excellent characteristics. Its hardness exceeds diamond single crystal, its toughness is superior to that of commercial cemented carbide, and its oxidation temperature is higher than that of cubic boron nitride single crystal itself. It is expected to become a new generation of tool materials in the steel material processing industry. Has a broad application prospects.

The scientists also found that the nano twinning CBN can continue to harden to 4 nm without softening as the thickness of the twin crystal decreases. This new discovery breaks the traditional understanding of the hardening mechanism of polycrystalline materials and points the way for the development of high performance superhard materials.

This research achievement was recently published in the world's leading magazine "Nature." "Nature" magazine introduced this achievement to the international media with "excellent super hard material" and pointed out that "this new material can open up a wide range of industrial applications." In the past ten years, Professor Tian Yongjun has been contributing to theoretical and experimental research on the hardness of materials under the continuous financial support of the National Outstanding Youth Science Project, key projects, and innovative group projects.