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Ptype and ntype aFeSi2 produced by utilizing mechanical alloying (MA) process and spark plasma sintering (SPS) technique were heattreated to transform their structure to the ptype and ntype bFeSi2, respectively. Raw powders of iron (99.5), silicon(99.9), manganese(99.5) and cobalt(99.9) were mixed and mechanically alloyed for 72 ks using a planetary ball mill. Mixing fractions of the powders for preparing ptype and ntype aFeSi2 were in accord with the mole fractions of the phases of Fe0.92Mn0.08Si2 and that of Fe0.98Co0.02Si2, respectively. The SPS process was carried out at 1293 K for 0.3 ks. The power factor of the ptype bFeSi2 heattreated at 973~1073 K for 7.2 ks was improved significantly as compared to that of the bFeSi2 prepared by only the SPS process without heat treatment. Maximum power factor was measured to be 0.46 mW/mK2 at 850 K for the ptype bFeSi2 heattreated at 1073 K for 7.2 ks. The power factor of the ntype bFeSi2 heattreated either at 973~1073 K for 3.6~7.2 ks or at 1173 K for 1.8~3.6 ks was improved as compared to that of the bFeSi2 prepared by only the SPS process without heat treatment. Maximum power factor was measured to be 0.15 mW/mK2 at 650 K for the ntype bFeSi2 heattreated at 1073 K for 7.2 ks. However the maximum power factors obtained were not improved sufficiently, because the eFeSi phase partially existed in the specimen and also the ptype and ntype bFeSi2 were contaminated with Fe, Cr and Ni originated from the MA pot and balls.

nippon kinzoku gakkaishi/nihon kinzoku gakkaishi

The Effects of Heat Treatment on the &amp;beta;-FeSi&lt;SUB&gt;2&lt;/SUB&gt; Transformation in the Fabrication of FeSi Thermoelectric Element Utilizing the MA/SPS Process