Self-healing of defects in ceramic composites ZrB2–SiC–TaB2 with dual composite structure
The paper presents the results of the study of self-healing of ceramic composite materials of ZrB2-SiC-TaB2 system with the structural architecture - «composite in composite», which is formed according to the principle of two-phase composite inclusions in two-phase composite matrix, and homogeneous distribution of components. It is shown that self-healing of surface defects occurs as a result of interaction of composite components with air oxygen, which provides filling of formed defects by products of oxidation reaction. It is revealed that the structure «composite in composite» allows to extend the temperature range of self-healing and increase the oxidation resistance of the studied ceramics. Dual composites with 10 and 20 vol% of composite inclusions and a composite with homogeneous distribution of components are characterized by self-healing at a lower temperature than composites with a higher content of composite inclusions, which is due to the lower oxidation resistance of the composite matrix based on ZrB2. On the surface of the composite with 20 vol% of inclusions, the defect is completely healed at 1400 °C, which is the lowest temperature for all the composites investigated. The dual composites with 30, 40 and 50 vol% inclusions have higher oxidation resistance compared to the composites with lower volume inclusion content, which is due to the localization of TaB2, which has a higher oxidation activation energy. The mass gain of composites with the volume content of inclusions more than 20 % is significantly lower than that of composites with lower inclusion content at all investigated annealing temperatures in air. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.
Keywords
zirconium diboride,
silicon carbide,
tantalum diboride,
«composite in composite»,
self-healingAuthors
| Shmakov Vasiliy V. | Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences | vvshmakov@ispms.ru |
| Buyakov Ales S. | Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences | alesbuyakov@ispms.ru |
| Lukyanets Marianna P. | Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences | mpv97@ispms.ru |
| Buyakova Svetlana P. | Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences | sbuyakova@ispms.ru |
Всего: 4
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