Fracture toughness and abrasive wear of (ZrTi)B2–SiC ceramic composites with low-modulus hexagonal boron nitride inclusions
| Parent link: | Ceramics International.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 51, iss. 18, Pt. B.— 2025.— P. 26401-26410 |
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| Weitere Verfasser: | , , , , , , |
| Zusammenfassung: | Title screen The study investigated the effect of hexagonal boron nitride (h-BN) content on fracture toughness and abrasive wear resistance of ZrB2–TiB2–SiC composites. Four compositions of ceramic composites were prepared from powder mixtures by pressure sintering at 1850 °C. In all the composites, the TiB2:ZrB2:SiC ratio was maintained as 16:69:15. The h-BN content in the ceramic composites was 3, 5, and 7 vol %. Sintering of the ceramic composites yielded the formation of (ZrTi)B2 solid solution, with the ratio of ZrB2 and TiB2 components remaining constant, irrespective of the h-BN content in the composites. The addition of hexagonal boron nitride into the (ZrTi)B2–SiC matrix was found to enhance fracture toughness through two mechanisms: crack propagation inhibition under residual compressive stresses and the Cook-Gordon mechanism. It was revealed that (ZrTi)B2–SiC–h-BN composites are more susceptible to abrasive wear when compared to (ZrTi)B2–SiC composites. Abrasive wear of (ZrTi)B2–SiC–h-BN composites occurs due to the formation of subsurface microcracks, their propagation to relatively weak interface between low-modulus h-BN inclusions and high-modulus (ZrTi)B2–SiC matrix, and subsequent separation of h-BN. The study showed that a greater number of subsurface microcracks are formed on the wear surface of (ZrTi)B2–SiC–h-BN composites compared to (ZrTi)B2–SiC composites. Furthermore, it was determined that composites containing 3 vol % h-BN exhibit the highest residual bending strength after abrasion Текстовый файл AM_Agreement |
| Sprache: | Englisch |
| Veröffentlicht: |
2025
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| Schlagworte: | |
| Online-Zugang: | https://doi.org/10.1016/j.ceramint.2025.03.321 |
| Format: | Elektronisch Buchkapitel |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=680129 |