Effect of TiO2 on sinterability and physical properties of pressureless sintered Ti3AlC2 ceramics |
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| Authors: | Yongqiang Tan Sigong Li Xiaochun Han Jiaxiang Xue Tong Liu Xiaosong Zhou Shuming Peng Haibin Zhang |
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| Affiliation: | 1. Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;2. Department of ATF R&D, China Nuclear Power Technology Research Institute, China General Nuclear Power Corporation (CGN), Shenzhen 518026, China |
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| Abstract: | TiO2 was selected as effective sintering aid for pressureless sintering of Ti3AlC2 ceramics in this study. The addition of only 5?wt% TiO2 largely promotes the densification and nearly dense Ti3AlC2 ceramic was obtained by pressureless sintering at 1500?°C. Significant strengthening and toughening effects were observed with the addition of TiO2. High Vickers hardness, flexural strength and fracture toughness of 3.22?GPa, 298?MPa and 6.2?MPa?m?1/2, respectively, were achieved in specimen pressureless sintered with 10?wt% TiO2. Additionally, the addition of 5?wt% TiO2 had no deleterious effect on the excellent oxidation resistance of Ti3AlC2 ceramic under 1200?°C water vapor atmosphere, while addition of 10?wt% TiO2 accelerates the oxidation rate by two orders of degree. |
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| Keywords: | Sintering aid Mechanical properties Oxidation resistance |
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