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"Nature" published the results of Yanshan University's superhard materials technology
"Nature" magazine recently published a groundbreaking study on the synthesis of polycrystalline superhard materials by researchers at Yanshan University. This innovation marks a major milestone in material science, as it introduces a new method for creating materials harder than natural diamond.
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 Industrial University, has successfully developed ultra-hard nano-crystalline cubic boron nitride (cBN) using high-pressure and high-temperature techniques. The findings were published in the latest issue of "Nature" on January 17, 2013.
This breakthrough is significant because, for the first time, scientists have created synthetic materials that surpass the hardness of single-crystal diamond. The research challenges traditional views on material hardening mechanisms and opens up new possibilities for developing advanced superhard materials.
Cubic boron nitride is widely used in industrial applications, especially in the machining of iron-based materials. However, its hardness has always been lower than that of diamond. By reducing grain size through nanostructuring, researchers have found a way to significantly enhance its performance. Using a special graphite-like boron nitride precursor, the team achieved a nanocrystalline structure with grain sizes as small as 14 nanometers.
Professor Tian and his team further improved the material by using an onion-like boron nitride structure as a precursor, resulting in a transparent, nano-twinned cubic boron nitride. With twin thicknesses as small as 3.8 nanometers, this material exhibits hardness equal to or even exceeding that of synthetic diamond. It also shows superior fracture toughness compared to commercial cemented carbide and better oxidation resistance than conventional cBN.
These properties make the nano-twin structured cubic boron nitride a highly promising tool material for industrial use. This research not only advances the field of superhard materials but also presents a novel strategy—achieving ultra-fine nano-twin structures—to create next-generation materials with exceptional performance."