Sintering behavior and mechanical properties of Ta4HfC5-based composites with ZrB2 additive |
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| Affiliation: | 1. National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, People’s Republic of China;2. Shandong Industrial Ceramic Research & Design Institute Co., Ltd., Zibo 255000, People’s Republic of China;3. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, People’s Republic of China;1. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, Henan, China;2. Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China;3. Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 5018055, Guangdong, China;4. Department of Chemistry and Chemical Biology, Rutgers University, Piscataway 08854, NJ, United States;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, and Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, China;2. Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;3. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, PR China;4. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, PR China;1. NPU-SAS Joint Research Center, School of Materials and Engineering, Northwestern Polytechnical University, Xi’an, Shanxi 710072, China;2. School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shanxi 710072, China;3. Joint International Research Laboratory of Impact Dynamics and its Engineering Application, Xi’an, Shanxi 710072, China;4. Shaanxi Key Laboratory of Impact Dynamics and its Engineering Application, Xi’an, Shanxi 710072, China;5. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi''an, Shanxi 710072, China;6. Institute of Extreme Mechanics, Northwestern Polytechnical University, Xi''an, Shanxi 710072, China |
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| Abstract: | Ta4HfC5 powder was synthesized using TaCl5, HfCl4 and phenolic resin as raw materials. Then, Ta4HfC5–10 vol% MoSi2 ceramics and Ta4HfC5–10 vol% MoSi2 with different proportions of ZrB2 (10 – 30 vol%) ceramics were sintered by spark plasma sintering. Zr atoms substituted Ta and Hf atoms in Ta4HfC5 during the sintering process at 2000 °C. The sintering behavior and microstructure evolution upon the ceramics are discussed. The mechanical properties of the composites were improved compared to the pure Ta4HfC5 ceramics. The hardness of Ta4HfC5–MoSi2 with 30 vol% ZrB2 increased from around 10 GPa to almost 13 GPa, the flexural strength increased from around 245–435 MPa, and the fracture toughness increased from 2.56 ± 0.12 MPa?m1/2 to 4.46 ± 0.20 MPa?m1/2. |
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| Keywords: | Spark plasma sintering Mechanical properties |
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