溶融体のガスアトマイズより作製されたSi-Ge粉体の焼結性に及ぼすボールミル効果

概要

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Each p- and n-type powder of Sio.8Ge0.2 for thermoelectric elements was prepared by gas atomization of the corresponding melts. Then, the relationship between the characteristics of Si-Ge powders and their sinter-ability was studied. Particular emphasis was placed upon understanding the effect of ball-milling on the sinterability of the as-prepared powders. The composition of the as-prepared powder was different from the batch composition due to melting and evaporation of the dopant above 1550 K. Ball-milling made the particle size of the as-prepared powders small, presumably together with introducing distortion to the crystal lattice. Densification of as-prepared powders was abruptly promoted above 1500 K by a pulse-current sintering; however, this densification temperature of the powders after ball-milling was lowered by approximately 100 K. The grain size and elemental inhomogeneity of the dense body after sintering were also reduced by ball-milling process.
社団法人日本セラミックス協会の論文
2003-10-01