Preparation and characterization of high-temperature resistant ZrC-ZrB2 nanocomposite ceramics derived from single-source precursor. (5th March 2017)

• Record Type: Journal Article
• Authors: Chen, Shugang; Gou, Yanzi; Wang, Hao; Jian, Ke; Wang, Jun
• Is Part Of: Materials & design. Volume 117(2017)
• Page Start: 257
• Page End: 264
• Publication Date: 2017-03-05
• Subjects: Precursor ZrC-ZrB2 Ceramization High-temperature resistance Oxidation resistance; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.12.041
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: In order to prepare ZrC-ZrB2 nanocomposite ceramics with high temperature stability from single-source precursors, the reactions of ZrCl4, allyl amine, allyl-MgCl and borane were employed to synthesize suitable precursors. The meliorated ZrNCB precursor had favorable solubility and higher ceramic yield (68.8 wt%), which was then transformed to ZrC-ZrB2 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 ZrB2 peaks. The content of ZrC and ZrB2 phases was relatively high in the nanocomposite ceramics at 1600 °C (over 80 wt%). The ZrC-ZrB2 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-ZrB2 nanocomposite ceramics have potential application for advanced rocket engines and nuclear industry. Graphical abstract: Highlights: Precursors were synthesized by reactions of allyl amine, ZrCl4, borane and the Grignard reagent (allyl-MgCl). Ceramization processes of the ZrNCB precursors were analyzed and ZrC-ZrB2 ceramics were obtained. The obtained nanocomposite ceramics have good high-temperature stability up to 2000 °C with dense and nano scaled structure. The ZrC-ZrB2 ceramics also have excellent stability at 1700 °C under air due to the oxidation layer formed on the surface.