Fabrication and mechanical properties of TiB2/ZrO2 functionally graded ceramics |
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| Affiliation: | 1. Bengbu College, Bengbu 233000, Anhui, China;2. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;3. Yucheng New Material Science and Technology Co. Ltd., Bengbu 233000, China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Division of Materials Science and Engineering, Hokkaido University, Japan;2. Division of Materials of Science and Engineering, University of Science and Technology, Beijing, China;1. Postdoctoral Mobile Research Station of Materials Science and Engineering, Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, PR China;2. Materials Science Centre, School of Materials, University of Manchester, Manchester M1 7HS, UK;3. College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, PR China;1. State Key Laboratory of Material Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. Naval University of Engineering, Wuhan 430033, China |
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| Abstract: | Five layers were considered for the present TiB2/ZrO2 functionally graded ceramics and TiB2/ZrO2 functionally graded ceramics were prepared by hot-pressing. The first layer, marked as L1, was composed of TiB2–15vol%SiC. The L2 layer was composed of TiB2–15vol%SiC–10vol%ZrO2. The L3 layer was composed of TiB2–25vol%ZrO2 without addition of SiC, because 25vol%ZrO2 was enough to densify TiB2. The last two layers, L4 and L5, were composed of TiB2–35vol%ZrO2 and TiB2–45vol%ZrO2, respectively. Denser graded microstructures as well as the stronger interfaces were achieved for TiB2/ZrO2 functionally graded ceramics hot-pressed at 1900 °C. Due to the phase transformation of ZrO2, the toughness of TiB2/ZrO2 functionally graded ceramics increased from ~ 4.3 MPa m1/2 for the TiB2-rich layer to ~ 8.9 MPa m1/2 for the ZrO2-rich layer. The effect of hot-pressing temperature on the toughness of TiB2/ZrO2 functionally graded ceramics was further investigated in detail. |
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