Oxidation behavior and physico-mechanical properties of spark plasma sintered ZrCN-ZrO2 ceramics
| Parent link: | Ceramics International.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 51, iss. 28, pt. A.— 2025.— P. 56792-56803 |
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| Summary: | Title screen ZrCN-ZrO2 ceramics were obtained by spark plasma sintering in a vacuum using commercial zirconium carbide and nitride powders containing zirconium dioxide as an impurity. The sintering of the initial powders produced bulk dense ceramic samples with varying stoichiometry. It has been established that the formation of zirconium carbonitride starts at a temperature of 1562 °C. The formation of zirconium carbonitride was determined using X-ray phase analysis, and the stoichiometry was determined according to Vegard's rule. Furthermore, under the specified conditions, samples based on zirconium carbide and zirconium nitride were obtained: ZrC-ZrO2, ZrN-ZrO2. With an increase in the content of the oxide phase, the porosity of the material decreased, indicating its intensifying role in the consolidation process. The mechanical properties increase with an increase in the N/(C + N) ratio, accompanied by a decrease in the subgrain sizes, a decrease in porosity, and an increase in the zirconium dioxide content to values of 17.63 GPa (indentation hardness), 4.22 MPa‧m1/2 (fracture toughness), 426.49 GPa (Young's modulus), 551.41 MPa (strength). At the same time, the highest strength was found in ZrN-ZrO2 ceramics – 623.12 MPa. It was found that the oxidative resistance of ZrCN-ZrO2 increases with an increase in the N/(C + N) ratio and the amount of the initial secondary oxide phase. At temperatures above 900 °C, an oxide layer consisting of cubic and monoclinic modifications of zirconium dioxide is formed on the surface of the materials. It has been established that the initial oxide phase in ceramics – c-ZrO2, due to the presence of defects – can be further oxidized with an increase in the lattice parameter, which in turn causes an increase in the oxidation resistance of the material Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2025
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| Online Access: | https://doi.org/10.1016/j.ceramint.2025.09.393 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=683082 |