About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
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Symposium
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Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
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Presentation Title |
Single-Source-Precursor Derived Novel HfBxCyN1-x-y Ultrahigh-Temperature Ceramics for Multifunctional Applications: Energy Conversion and Thermal Protection |
Author(s) |
Wei Li, Jinxue Ding, Kathy Lu |
On-Site Speaker (Planned) |
Wei Li |
Abstract Scope |
In the present work, monolithic BCN and HfBxCyN1-x-y ceramics were successfully fabricated via a polymer-derived ceramic (PDC) approach combined with spark plasma sintering (SPS). The single-source precursor was synthesized by the reaction of a pyridine borane and tetrakis-(dimethylamido) hafnium(IV). The Hf-modified pyridine borane exhibits a higher ceramic yield than that of pure pyridine borane after pyrolysis at 1100 °C under argon. Moreover, XRD and TEM results show that the HfBxCyN1-x-y ceramics with a cubic crystal structure can be prepared at 1700 oC. Therefore, SPS was applied to fabricate bulk BCN and HfBxCyN1-x-y specimens at the same temperature. Subsequently, the electrical/thermal conductivity, Seebeck coefficient, and power factor were characterized at different temperatures to evaluate the energy conversion efficiency. Finally, the thermal stability of the obtained sample was measured up to 1600 oC. The results show that the polymer-derived HfBxCyN1-x-y ceramic is a potential candidate for energy conversion and thermal protection. |