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GRADUATE RESEARCH PROJECTS

My research focus is based on the manufacturing of multifunctional ceramic materials, especially on their electrical/dielectric, mechanical, and thermal properties, and the process of manufacturing such materials for high-temperature applications.

 

Starting from our breakfast cereal bowl till setting up the quartz clock for the next morning, ceramic has been a part of our daily life. What is so special about ceramics? They have unique properties such as high melting point, oxidation resistance, chemical and thermal stability, high hardness and strength that can be used extensively in extreme condition applications. The extreme conditions include hypersonic vehicles, turbines engines, power plants, and nuclear reactors. My work is to fabricate multifunctional ceramics and ceramic composites (SiC/C, SiOC/C, SiOC/ZrB2, SiCN, SiCN/BNNT, C/C) from polymeric precursors with tailored properties like high thermal/electrical conductivity, EM absorbing / EM reflecting materials, or thermally/electrically  insulative that can be used in harsh environments. (Google Scholar)

Electromagnetic property of polymer derived SiC–C solid solution formed at ultra-high temperature  (Link) 

High-performance electromagnetic interference (EMI) shielding materials in harsh environment are highly required for electronics and aerospace applications. This study reports the EMI shielding property of a polymer derived SiC–C solid solution formed at ultra-high temperature, which has not been reported in the open literature. Microstructure characterization revealed that the change and distribution of carbon structure resulted in the electromagnetic property change. The results of this study provided a new method of designing EMI shielding materials by making a carbon solid solution that could change the potential application of the PDC-SiC from microwave absorption to EMI shielding.

Wide-band tunable microwave-absorbing ceramic composites made of polymer-derived SiOC ceramic and in situ partially surface-oxidized ultra-high-temperature ceramics (Link)

Microwave-absorbing materials in a high-temperature harsh environment are highly desired for electronics and aerospace applications. This study reports a novel high-temperature microwave-absorbing ceramic composites made of polymer-derived SiOC ceramic and in situ partially surface-oxidized ultra-high-temperature ceramic (UHTC) ZrB2 nanoparticles.The results provide new insights in designing microwave-absorbing materials with a wide absorption frequency range and strong absorption loss for high-temperature harsh environment applications.

Semiconductor‐conductor transition of pristine polymer‐derived ceramics SiC pyrolyzed at temperature range from 1200° C to 1800° C (Link)

This paper studies the effect of pyrolysis temperature on the semiconductor‐conductor transition of pristine polymer‐derived ceramic silicon carbide (PDC SiC). A comprehensive study of microstructural evolution and conduction mechanism of PDC SiC pyrolyzed at the temperature range of 1200°C‐1800°C is presented. The samples demonstrate metal‐like conductive response and their resistivity increases monotonically with the increasing measuring temperature.

Few other projects

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