碲化铋-碳纤维水泥基材料的制备及热电性能

摘要

Bismuth telluride-carbon fiber reinforced cement composites were prepared in two ways,bismuth telluride mixed with cement and as coating.Influences of the dosage of Bi2 Te3 and the adding method on the thermoelectric properties of cement composites were studied,and a thermoelectric model was proposed for bis-muth telluride as coating in cement composites.The results indicate that electric polarization effects were ob-served in bismuth telluride mixed cement composites and electric polarization weakened with the prolonging of curing time.The addition of Bi2 Te3 could greatly enhance the thermoelectric properties of cement composites and the way that Bi2 Te3 was used as coating showed better thermoelectric property.The Seebeck coefficients of Bi2 Te3 coating and carbon fiber reinforced cement lamina were calculated based on the thermoelectric model in-dicating that Bi2 Te3 coating was of higher Seebeck coefficient,enhancing the thermoelectric properties of whole cement composites.%采用混掺和涂层两种方式制备碲化铋(Bi2 Te3)-碳纤维水泥基材料，研究了 Bi2 Te3掺量和掺加方式对水泥基材料热电性能的影响，并建立了涂层掺加方式下水泥基材料的热电模型。结果表明，混掺Bi2 Te3的碳纤维水泥基材料表现出极化效应，随着养护龄期的延长，极化效应减弱；掺加 Bi2 Te3可以显著改善碳纤维水泥基材料的热电性能，以 Bi2 Te3作为涂层的水泥基材料比混掺具有更好的热电性能；热电模型分别计算 Bi2 Te3涂层和碳纤维水泥薄片的 Seebeck系数，表明 Bi2 Te3涂层具有较高的 Seebeck 系数，从而提高整体水泥基材料的热电性能。