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Effect of TiB2 nano-inclusions on the thermoelectric properties of boron rich boron carbide

: Ponnusamy, Prasanna; Feng, Bing; Martin, Hans-Peter; Groen, Pim


Materials today. Proceedings 5 (2018), No.4, Pt.1, pp.10306-10315
ISSN: 2214-7853
European Conference on Thermoelectrics (ECT) <14, 2016, Lisbon>
Journal Article, Conference Paper
Fraunhofer IKTS ()
boron rich boron carbide; BxC-TiB2 composite; thermoelectric properties; densification

Boron carbide has exceptional thermoelectric properties due to its unique crystal structure. The effects of nano-TiB2 on the thermoelectric properties of boron rich boron carbide is presented here. Boron rich boron carbide-TiB2 composites were prepared in-situ by sintering of wet ball milled B, B4C and nano-TiO2 powders through Spark Plasma Sintering (SPS) at 1900 °C from. Five different compositions of the composite were prepared- with 1, 2.5, 5, 7.5 and 10 wt.% TiO2. The dependence of densification and thermoelectric properties on TiO2 content were studied. The microstructure was observed through Field Emission Scanning Electron Microscope (FESEM) and phases were analyzed using X-ray diffraction (XRD). The electrical property was found to increase due to metallic TiB2 phase and so the Seebeck coefficient reduced consequently. The overall dimensionless figure of merit was found to be higher due to the formation of boron rich phase but the effect of TiO2 was not significant. The increase in lattice parameter for different TiB2 showed that the reaction during sintering depends on the amount of TiO2 added.