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- W4200291387 endingPage "2020" @default.
- W4200291387 startingPage "2015" @default.
- W4200291387 abstract "Tough and hard ultrafine-grained B4C-cBN composites were firstly fabricated by high-pressure sintering mixed B4C and cBN nanopowders at 6 GPa and 1700 °C. The phase transition from cBN to hBN is avoided by high pressure during the sintering process. The effects of the cBN content on the densification and mechanical properties of B4C-cBN composites were evaluated. The results indicated that the hardness of the as-fabricated composites increased gradually with the increase of cBN content. The composite composed of 50 wt.% cBN exhibited excellent comprehensive mechanical properties with relative density of 98.6 %, density of 2.9 g/cm3, Vickers hardness of 36.2 GPa and fracture toughness of 6.7 MPa·m1/2. The introduction of superhard cBN maintained the lightweight and high hardness while enhancing the fracture toughness of the B4C. The main toughening mechanisms were crack bridging, crack deflection and pull-out of homogeneously dispersed cBN grains." @default.
- W4200291387 created "2021-12-31" @default.
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- W4200291387 date "2022-05-01" @default.
- W4200291387 modified "2023-09-27" @default.
- W4200291387 title "Hard and tough ultrafine-grained B4C-cBN composites prepared by high-pressure sintering" @default.
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- W4200291387 doi "https://doi.org/10.1016/j.jeurceramsoc.2021.12.033" @default.
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