Polymer-derived SiHfN ceramics: From amorphous bulk ceramics with excellent mechanical properties to high temperature resistant ceramic nanocomposites |
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| Affiliation: | 1. College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, PR China;2. Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany;3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;4. School of Materials Science and Engineering, Zhengzhou University, Henan 450001, PR China;5. Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS, 63755 Alzenau, Germany;1. School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China;2. Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guiyang 550025, China;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Electronic Convergence Materials Center, Advanced Materials Convergence R&D Division, Korea Institute of Ceramic Engineering and Technology, Jinju, Gyeongsangnam-do 52851, Republic of Korea;1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, PR China;3. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan;1. Department of Extreme Environmental Coatings, Korea Institute of Materials Science, Changwon, Gyeongnam 51508, Republic of Korea;2. Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Gyeongnam 51140, Republic of Korea;3. Research Center of Modern Surface and Interface Engineering, Anhui University of Technology, Maanshan 243002, China;1. Laboratory for High Performance Ceramics, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India;2. CALPHAD Lab, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India;3. Ceramic Technologies Group – Centre of Excellence in Materials and Manufacturing for Futuristic Mobility, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India;4. Institute for Materials Sciences, Technical University of Darmstadt, Darmstadt 64287, Germany;5. Fraunhofer Institution for Materials Recycling and Resource Strategies (Fraunhofer IWKS), Brentano str. 2a, D-63755 Alzenau, Germany;6. Institute of Applied Geosciences, Technical University of Darmstadt, Darmstadt 64287, Germany |
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| Abstract: | Within the present work, additive-free amorphous bulk SiHfN ceramics with excellent mechanical properties were prepared by a resource-efficient low-temperature molding method, namely warm-pressing. As densification mechanism viscous flow has been identified based on cross-linking reaction. The critical problems concerning gas evolution and crystallization inducing bloating and cracking are addressed through controlled thermolysis and pressure. The microstructural evolution of the SiHfN ceramics indicates that the incorporation of Hf in perhydropolysilazane not only increases the ceramic yield (97.4 wt%) and crystallization resistance (1300 °C), but also suppresses the transformation from α-Si3N4 to β-Si3N4 at high temperatures (1700 °C). Especially, HfN/α-Si3N4 nanocomposites converted by the SiHfN ceramics at 1500 °C show a slight weight loss of 3.13 wt%, indicating the high temperature resistance of the ceramic nanocomposites. The method proposed in this work opens a new strategy to fabricate additive-free polycrystalline Si3N4- and amorphous Si3N4-based (nano)composites. |
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| Keywords: | Amorphous SiHfN ceramic Warm-pressing Ceramic nanocomposites Mechanical properties |
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