Preparation and characterization of polymer-derived Zr/Si/C multiphase ceramics and microspheres with electromagnetic wave absorbing capabilities. Issue 5 (May 2017)

• Record Type: Journal Article
• Authors: Zhang, Qiance; Gou, Yanzi; Wang, Jinlong; Wang, Hao; Jian, Ke; Wang, Yifei
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 5(2017)
• Page Start: 1909
• Page End: 1916
• Publication Date: 2017-05
• Subjects: Polymer-derived ceramics -- Zr/Si/C -- Microspheres -- Electromagnetic wave absorption; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.01.006
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Precursors for Zr/Si/C multiphase ceramics were synthesized by the reactions of dilithiozirconocene complex with dichlorodimethylsilane, methyltrichlorosilane and dichloromethylvinylsilane, respectively. The precursor-to-ceramic process of the precursor was investigated by TG-GC–MS and TG-FTIR analyses, confirming a complete transformation from organometallic polymers into ceramics below 800 °C. Annealing experiments of the derived ceramics at temperatures from 1000 °C to 2000 °C indicated the crystallization from ZrSiO4, ZrO2 to ZrC. Furthermore, micrometer-sized Zr/Si/C ceramic microspheres were successfully fabricated from the precursor at 1000 °C, showing surface morphology like wrinkled pea. According to the XRD, HRTEM and XPS analyses, such multiphase ceramic microspheres consist of ZrSiO4, ZrO2, and amorphous SiOx Cy . Interestingly, the ceramic microspheres performed satisfactory electromagnetic wave absorbing capacity with the RLmax reaching −34 dB, which could be potential candidates for electromagnetic micro-devices.