B6O-Based Composite to Rival Polycrystalline Cubic Boron Nitride


  • The authors thank the National Natural Science Foundation of China (Grant Nos. 50 572 067 and 50 621 061) and the State Key Development Program for Basic Research of China (Grant No. 2005CB623 602) for financial support of this work.


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A one-step sintering process is developed to prepare nanostructured super-hard B6O?B4C compacts (see figure) from a mixture of B, B2O3, and B4C precursors at a mild pressure of ∼3GPa and high temperatures ranging from 1500–1900 K. The sintered B6O–B4C compacts exhibit hardness values comparable to commercially available polycrystalline BN and are used for the high-speed cutting of hardened steel.