Synthesis of cBN-hBN-SiC_w Nanocomposite with Superior Hardness, Strength, and Toughness.

ABSTRACT: Nanocomposites with one-dimensional (1D) and two-dimensional (2D) phases can demonstrate superior hardness, fracture toughness, and flexural strength. Cubic boron nitride-hexagonal boron nitride-silicon carbide whiskers (cBN-hBN-SiC_w) nanocomposites with the simultaneous containing 1D SiC_w and 2D hBN phases were successfully fabricated via the high-pressure sintering of a mixture of SiC_w and cBN nanopowders. The hBN was generated in situ via the limited phase transition from cBN to hBN. Nanocomposites with 25 wt.% SiC_w exhibited optimal comprehensive mechanical properties with Vickers hardness of 36.5 GPa, fracture toughness of 6.2 MPa·m^1/2, and flexural strength of 687.4 MPa. Higher SiC_w contents did not significantly affec

SUBMITTER: Sun L 

PROVIDER: S-EPMC9823861 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature