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- W4225597421 abstract "Abstract In this work, CeO 2 sintering additive reinforced B 4 C ceramic composites were prepared by hot‐pressing reaction sintering under different processes of low temperature–long holding time (1980°C, 30 MPa, 3 h, 4 wt% CeO 2 ) and high temperature–short holding time (2050°C, 30 MPa, .5 h, 4 wt% and 6 wt% CeO 2 ). The effect of sintering process and CeO 2 content on the microstructure and mechanical properties of B 4 C‐CeB 6 composites were investigated. The existed impurities in the obtained composites were also analyzed. Results show that CeO 2 is an active sintering additive. CeB 6 is formed by the reaction between CeO 2 , B 4 C and C in sintering process. The densification of B 4 C ceramics is enhanced, and the grains can be refined by the formed CeB 6 , which promotes the strength. The thermal expansion coefficient mismatch, crack deflection, and fracture mode change caused by the in situ formed CeB 6 improve the toughness. The process of low temperature–long holding time is more suitable for playing the role of CeO 2 additive in sintering of B 4 C, under which condition the relative density, flexural strength, fracture toughness, and hardness reach 99%, 417 MPa, 5.32 MPa·m 1/2 , and 30.66 GPa, respectively. The impurities in the composites are the kinds of Ti‐contained, C‐O‐Mg‐Ca‐contained, C‐O‐Ca‐S‐contained, and Si‐contained impurities." @default.
- W4225597421 created "2022-05-05" @default.
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- W4225597421 date "2022-04-18" @default.
- W4225597421 modified "2023-10-16" @default.
- W4225597421 title "Performance of B <sub>4</sub> C/CeB <sub>6</sub> composites fabricated via hot pressing under different processes" @default.
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- W4225597421 doi "https://doi.org/10.1111/ijac.14049" @default.
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