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- W2073228191 abstract "Thermoelectric materials of Fe0.91Mn0.09Si2+x mass%Cu (0≤x≤1.5) were produced by spark-plasma sintering (SPS) and their thermoelectric properties were measured. The densification was completed in one minute after the temperature reached 900°C. Liquid phase sintering probably occurred during the heating because the addition of copper enabled the specimen to be highly densified. The relative density of the specimen with 1.5%Cu was 94%, while that of the specimen without copper was 90%. Copper also promotes transformation to the β-phase. The ε-phase ratio: fε=Iε⁄(Iε+Iβ)×100, (Iε = intensity of ε(210), Iβ = intensity of β(220, 202)) was calculated from the XRD results in order to easily evaluate the amount of the ε-phase in the specimen. In a temperature range from 670 to 730°C, copper allows the annealing time to be shortened by about a half the annealing time without copper. However, an excessive amount of copper and an excessive annealing time had a bad influence on the Seebeck coefficient and the power factor, though the ε-phase ratio of the specimen decreased. The optimum composition is Fe0.91Mn0.09Si2+1%Cu, and the optimum annealing conditions are thirty minutes at 700°C. The power factor of the optimum specimen is about 1.6 times greater than that of the specimen annealed for sixty minutes at 670°C without copper. Thus, it is concluded that the SPS method is extremely effective for the rapid production of β-FeSi2." @default.
- W2073228191 created "2016-06-24" @default.
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- W2073228191 date "2000-01-01" @default.
- W2073228191 modified "2023-09-24" @default.
- W2073228191 title "Influence of Copper Addition on the Rapid Production of β-FeSi<SUB>2</SUB> by Spark-Plasma Sintering" @default.
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- W2073228191 doi "https://doi.org/10.2320/matertrans1989.41.815" @default.
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