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We have prepared a sintered CoSb3–FeSb2 composite where the FeSb2 particles are dispersed in the CoSb3 matrix by mechanical grinding (MG) and hot pressing, and investigated the Seebeck coefficient, electrical resistivity, and thermal conductivity in order to estimate the corresponding figure of merit. The thermal conductivity of the composite is lower than that of CoSb3. The electrical resistivity of the composite increases with increasing MG time, but it is lower than that of CoSb3 at high temperature. The decrease in the thermal conductivity and the lesser increase in the electrical resistivity are ascribed to the enhancement of phonon scattering caused by the dispersion of FeSb2 particles in the CoSb3 matrix and the low electrical resistivity of FeSb2, respectively. As a result, the composite whose molar ratio of CoSb3 to FeSb2 is 0.7:0.3 and the MG time is 25 h has a maximum figure of merit value of 6.1×10−4 K−1 at 756 K. This value is much larger than the maximum value of CoSb3 at 482 K of 3.2×10−4 K−1.

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For the purpose oj illl'estigatillg the illtemal state oj a blast Jumace ill olleratioll, H igashida No.5 B .F. ha villg the illller volume oj 646 m" was water-quenched while ill a lIormal operatillg cOlldilioll alld dissected ill 1968. This was the first attempt to dissect a commercial blast Jumace in J apall. Hirohata No. I B.F. with the ;/11le, volume oj 1-107 m" which had beell operated with cOllsiderably high productivity, was lIext dissected ill 1970. Theil , Kukioka No. 4 B.F. havillg the illller volume oj I 279 "," was dissected ill 197 1 to illvestigate the characteristics of a low coke rat;o bLast Ji/rnace. D escriptiolls oj th e dissectioll Ilrocedu re. general observatiolls all the internal stale oj these blast furnaces, characteristics oj each furnace. alld feiatiollshijlS betweell the illiemal state alld operalillg cOllditiolls are givell in this re/lort.