A meltable precursor for zirconium carbide ceramics and C/C-ZrC composites |
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Authors: | Yong Li,Si an Chen,Haifeng Hu,Chunrong Zou,Zhihua Chen,Xin Ma |
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Affiliation: | 1. Northwest Institute of Nuclear Technology, Xi''an 710024, China;2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;3. National Institute of Defense Technology Innovation, Academy of Military Sciences PLA China, Beijing 100010, China;4. The Chinese People'' Liberation Army 95835 Force, Wulumuqi 841700, China;5. Avic Composites Corporation LTD, Beijing 101300, China |
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Abstract: | For process simplification and rapid densification of ceramic composites, a meltable single-source ZrC precursor was prepared by condensing zirconium acetylacetonate (Zr(acac)4) at 190?°C for 40–150?min. The preparation of ZrC precursor and the conversion from precursor to ceramics were investigated by using FTIR and NMR spectroscopies, GPC, DSC-TGA, XRD, SEM, EDS and TEM. The precursor had low viscosity (~ 10?mPa?s) and proper processing window (60?min) for precursor infiltration and pyrolysis (PIP). The ceramic yield at 1650?°C was 29.6%, and EDS revealed that the composition was (ZrC)0.337(HfC)0.0025(ZrO2)0.044C0.1865. The ceramics were composed of 0.2–0.5?µm grains which aggregated to form a stacked structure surrounded by amorphous carbon. The preparation processes were designed, and C/C-ZrC composites with the density of 2.45?g/cm3 were successfully fabricated through 11 cycles of PIP with Zr(acac)4. In conclusion, the synthetic method provides a simple and cheap route for precursors, and allows combined composite preparation with high efficiency. |
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Keywords: | Zirconium carbide Meltable precursor Condensation Pyrolysis |
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