title: The Peculiarities of Structure Formation and Properties of Zirconia-Based Nanocomposites with Addition of Al2O3and NiO.
abstract: The present study is devoted to the problem of enhancing fracture toughness of ZrO2ceramic materials through the formation of composite structure by addition of Al2O3and NiO particles. In this paper, we analyzed the general and distinguished features of microstructure of both composite materials and its effect on fracture toughness of materials. In this paper, we used the XRD, SEM, and EDS methods for determination of granulometric, phase, and chemical composition of sintered materials. The peculiarities of dependence of fracture toughness values from dopant concentration and changing the Y3+amount in zirconia grains allow us to assume that at least two mechanisms can affect the fracture toughness of ZrO2ceramics. Crack bridging/deflection processes with the "transformation toughening" affect the K1Cvalues depending on the dopant concentration. Crack deflection mechanism affects the K1Cvalues when the dopant concentrations are low, and transformation toughening affects the K1Cvalues when the dopant concentrations begin to have an impact on microstructure reorganization-redistribution of Y3+ions and formation of Y3+-depleted grains with high ability to phase transformation.
authors.affiliation: Donetsk Institute for Physics and Engineering named after O.O. Galkin NAS of Ukraine, Nauki av., 46, Kiev, 03680, Ukraine. igord69@ukr.net.
authors.forename: I
authors.initials: I
authors.lastname: Danilenko
authors.affiliation: Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, Pfaffenwaldring 32, 70569, Stuttgart, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Lasko
authors.affiliation: Donetsk Institute for Physics and Engineering named after O.O. Galkin NAS of Ukraine, Nauki av., 46, Kiev, 03680, Ukraine.
authors.forename: I
authors.initials: I
authors.lastname: Brykhanova
authors.affiliation: Donetsk Institute for Physics and Engineering named after O.O. Galkin NAS of Ukraine, Nauki av., 46, Kiev, 03680, Ukraine.
authors.forename: V
authors.initials: V
authors.lastname: Burkhovetski
authors.affiliation: Donetsk Institute for Physics and Engineering named after O.O. Galkin NAS of Ukraine, Nauki av., 46, Kiev, 03680, Ukraine.
authors.forename: L
authors.initials: L
authors.lastname: Ahkhozov
keywords: Fracture toughness; Phase transformation; Zirconia composites