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Fracture toughness of a layered-gradient ceramic composite ZrC-Al2O3
Buyakova S. P.
1, Mirovoy Y. A.
1, Burlachenko A. G.
1, Shmakov V. V.
1, Lukyanets M. P.
1, Fotin I. A.1, Abdulmenova E. V.
1, Buyakov A. S.
1
1Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, Russia
Email: sbuyakova@ispms.ru, y.a.mirovoy@ispms.ru, aleksandrburlachenko@ispms.ru, vvshmakov@ispms.ru, mpv97@ispms.ru, i.fotin2010@gmail.com, Ekaterina.V.Abdulmenova@yandex.ru, alesbuyakov@gmail.com
Fracture toughness and propagation of the main crack in ceramic composite ZrC-Al2O3 with a layered-gradient structure have been studied. Outer layers of the studied material consisted of ZrC and Al2O3, while intermediate layers were composites of these two materials with different ratios of components. The study has shown that fracture toughness of the layered-gradient composite with crack initiation in the ZrC layer is higher than that in the case of crack initiation in the Al2O3 layer. This is due to the influence of tensile and compressive elastic residual stresses along the crack path, whose magnitude is determined by the difference in thermal expansion coefficients on different sides of the phase interface crossed by the crack. Keywords: layered-gradient composites, fracture toughness, zirconium carbide, aluminum oxide.
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