Preparation and characterization of high-temperature resistant ZrC-ZrB2 nanocomposite ceramics derived from single-source precursor
Abstract In order to prepare ZrC-ZrB 2 nanocomposite ceramics with high temperature stability from single-source precursors, the reactions of ZrCl 4 , allyl amine, allyl-MgCl and borane were employed to synthesize suitable precursors. The meliorated ZrNCB precursor had favorable solubility and higher ceramic yield (68.8wt%), which was then transformed to ZrC-ZrB 2 ceramics at different temperatures. The main phase of the ceramics was amorphous at 1000°C. As the temperature increased, the amorphous phases started to crystallize, resulting in the appearance of ZrC and ZrB 2 peaks. The content of ZrC and ZrB 2 phases was relatively high in the nanocomposite ceramics at 1600°C (over 80wt%). The ZrC-ZrB 2 nanocomposite ceramics showed good high temperature stability up to 2000°C. Oxidation test indicated that an oxide layer was formed on the ceramic surface at 1700°C under air to prevent further oxidation of the ceramics. With excellent high temperature and oxidation resistances, the ZrC-ZrB 2 nanocomposite ceramics have potential application for advanced rocket engines and nuclear industry. Highlights Precursors were synthesized by reactions of allyl amine, ZrCl 4 , borane and the Grignard reagent (allyl-MgCl). Ceramization processes of the ZrNCB precursors were analyzed and ZrC-ZrB 2 ceramics were obtained. The obtained nanocomposite ceramics have good high-temperature stability up to 2000°C with dense and nano scaled structure. The ZrC-ZrB 2 ceramics also have excellent stability at 1700°C under air due to the oxidation layer formed on the surface. Graphical abstract [DISPLAY OMISSION]
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