The influence of W2B5 addition on microstructure and thermoelectric properties of B4C ceramic
Source abstract
Abstract
Abstract B 4 C and B 4 C–W 2 B 5 composite ceramics are prepared via hot pressing. The composition and microstructure of the ceramics are characterized by means of X-ray diffraction (XRD), electron probe microanalysis (EPMA) and transmission electron microscope (TEM). Their electrical conductivity and Seebeck coefficient are measured from room temperature up to 1500 K. These results show that the values of electrical conductivity for the B 4 C–W 2 B 5 composite ceramic are much higher than that for the B 4 C ceramic, but that the values of the Seebeck coefficient for the composite ceramic are somewhat lower than that for the B 4 C ceramic. Both electrical conductivity and Seebeck coefficient increase with increasing temperature. The figure of merit of the composite ceramic is higher than that of the B 4 C ceramic, though the thermal conductivity of the B 4 C ceramic is somewhat lower than that of the composite ceramic. The reason for the enhancement in the figure of merit of the composite ceramic is discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Boron and Carbon Nanomaterials Research · MXene and MAX Phase Materials · Aluminum Alloys Composites Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (8)
Show source-provided references
1. Conduction mechanism in boron carbide10.1103/PhysRevB.29.4582 ↗
2. Thermoelectric properties of a composite medium10.1063/1.349830 ↗
3. A quantitative analysis of the thermoelectric power measurements on composite Al–Ge films10.1063/1.353987 ↗
4. R. Watanabe, M. Miyajima, Investigation on the thermoelectric properties of B4C-Si-B system, in: I. Shiota, Miyamoto (Eds.), Functionally Graded Materials 1996, 1997, pp. 515–518.
5. A. Argua, K. Tsuneyoshi, The effect of boron addition on the thermoelectric properties of B4C, in: I. Shiota, Miyamoto (Eds.), Functionally Graded Materials 1996, 1997, pp. 611–615.10.1016/B978-044482548-3/50100-1 ↗
6. G.H. Tang, The preparation and mechanical properties of B4C–TiB2–W2B5 composites, in: Proceeding of 8th Conference of Composite of China, 1994, pp. 363–366.
7. Properties of polycrystalline boron carbide sintered in the presence of W2B5 without pressing10.1007/BF00722070 ↗
8. ASTM Specification C373, ASTM Standards part 13, American Society for Testing and Materials, Philadelphia, 1969.