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"Nature" published the results of Yanshan University's superhard materials technology
"Nature" has published a groundbreaking study on the synthesis of polycrystalline superhard materials by researchers at Yanshan University. The study marks the first successful creation of a cubic boron nitride (c-BN) material that surpasses the hardness of diamond single crystals.
On January 18, a reporter from Yanshan University revealed that a research team led by Professor Tian Yongjun from the State Key Laboratory of Metastable Materials Preparation Technology and Science, along with collaborators from Jilin University, the University of Chicago, and Hebei University of Industry, achieved a major breakthrough in superhard material synthesis. Their work, published in the latest issue of *Nature* on January 17, 2013, describes the successful production of ultra-hard nano-crystalline cubic boron nitride using high-pressure and high-temperature techniques.
This discovery not only challenges traditional theories about material hardening but also opens a new path for creating advanced superhard materials. Cubic boron nitride is widely used in industrial applications, particularly in processing iron-based materials. However, synthetic c-BN single crystals have historically been less hard than natural diamonds.
The research team used a novel approach involving the martensitic transformation of graphite-like boron nitride precursors under extreme conditions. They successfully synthesized nanocrystalline c-BN with grain sizes as small as 14 nanometers. More impressively, Tian Yongjun and his colleagues developed a transparent nano-twinned cubic boron nitride using an onion-like boron nitride structure as a precursor. This material features twin layers as thin as 3.8 nanometers and exhibits hardness equal to or greater than synthetic diamond.
In addition, the material demonstrates superior fracture toughness compared to commercial cemented carbide and higher oxidation resistance than conventional c-BN. These properties make it a promising candidate for next-generation cutting tools and industrial applications.
This study highlights a new strategy for synthesizing high-performance superhard materials—by creating ultra-fine nano-twin structures. It represents a significant leap forward in material science and could revolutionize industries reliant on hard materials.