Effects of carbonyl nickel powder addition on the mechanical properties,microstructure, and yttrium segregation of sintered 3YSZ composites |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People''s Republic of China;2. Research Centre for Materials Science and Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, People''s Republic of China;3. School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, People''s Republic of China;1. School of Materials Science and Engineering, Inha University, 253 Younghyun-Dong, Nam-Gu, Incheon 402-751, Republic of Korea;2. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ward, Sagamihara, Kanagawa 252-5210, Japan;1. Lobachevsky State University of Nizhny Novgorod, 23 Gagarina av., 603950 Nizhny Novgorod, Russian Federation;2. All-Russian Research Institute of Chemical Technology, 33 Kashirsk Highway, 115409 Moscow, Russian Federation;1. Material Physics and Chemistry Research Center, School of Physics and Nuclear Energy Engineering, Beihang University, 100191, Beijing, China;2. Hebei Key Laboratory of Optic-electronic Information Materials, College of Physics Science and Technology, Hebei University, 071000, Hebei, China;1. Key Lab. for New Type of Functional Materials in Hebei Province, Hebei University of Technology, No.1 Dingzigu Road, Hongqiao District, Tianjin 300130, PR China;2. Beijing National State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China |
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| Abstract: | In this study, the effects of the addition of carbonyl nickel powder on the density, microstructure, and mechanical properties of sintered yttria-stabilized zirconia (3YSZ) were investigated. Sintering at 1300 °C resulted in the optimum comprehensive mechanical properties. The addition of 5 vol% carbonyl Ni increased the fracture toughness and flexural strength from 9.51 MPa m1/2 to 14.5 MPa m1/2 and from 747 MPa to 873 MPa, respectively. The addition of carbonyl nickel showed greater improvement than did the addition of spherical Ni powder. The dendritic morphology improved the interface bonding between the ceramic and the metal, enabling a bridging mechanism of the ductile phase. However, further Ni addition decreased the mechanical properties. X-ray diffraction results showed that the amounts of the monoclinic phase (M) and cubic phase (C) of 3YSZ increased, whereas the amount of the tetragonal phase (T) decreased. The Y segregation near the Ni particles, which was confirmed by an energy dispersive spectrometer (EDS), caused the phase changes. The segregation of Y occurred during the cooling stage, rather than the holding stage, of sintering. During the cooling stage, the heat mismatch between Ni and ZrO2 resulted in strong elastic strain energy, which promoted Y segregation. |
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| Keywords: | Composites Mechanical properties Toughness and toughening Yttrium segregation |
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