Abstract
TiB 2/B 4C composite ceramics are prepared via hot pressing, in which the TiB 2 particles are formed by introducing TiC 0.78 and through the reaction between B 4C and TiC 0.78. The electrical and thermal conductivities and Seebeck coefficient of samples containing 0, 12.5 and 25.4 vol% TiB 2 are measured from room temperature up to 1200 K. The results show that the transport properties of the samples vary with the TiB 2 content. The transport properties of a 12.5 vol% TiB 2/B 4C sample are dominated by the B 4C matrix as in undoped B 4C ceramics, whilst the transport properties of a 25.4 vol% TiB 2/B 4C sample are dominated by TiB 2 particles. The figure of merit of the 25.4 vol% TiB 2/B 4C sample is higher than that of the undoped B 4C ceramic sample between room temperature and about 700 K, which indicates that it is possible to improve the thermoelectric properties by selecting an optimum combination of different materials.
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