TiSe_<1.6>及びTiSe_<1.5>のホットプレス焼結と熱的変化

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Thermal changes in hot-pressed TiSe_<l.6> and TiSe_<l.5> are investigated in an argon atmosphere up to 1500℃. X-ray powder diffraction analysis of synthesized TiSe_<l.6> showed mixed diffraction patterns of hexagonal type TiSe_<l.6> and monoclinic type Ti_5Se_8.Ti_5Se_8 disappeared after hot-pressing at 500°-600℃. Above this temperature range, only hexagonal phase was found. TiSe_<1.6> releases some Se atoms and Se/Ti ratio decreases by hot-pressing above 1300℃. Hot-pressing at 1500℃ gives an Se/Ti ratio approximately equal to 1.5. As reported in our previous paper, synthesized TiSe_<1.5> is hexagonal. The X-ray diffraction pattern of TiSe_<1.5> is similar to that of hexagonal type TiSe_<1.6> except some small diffraction peaks which might be of superstructures. The lattice parameters of TiSe_<1.5> are slightly different from those of hexagonal TiSe_<1.6>. TiSe_<1.5>, is stable up to 1500℃. Progressive densification and grain growth in TiSe_<1.6> start at relatively low' temperatures. In TiSe_<1.5>, densification and grain growth proceed at rather higher temperature range. These differences in sintering behavior between TiSe_<1.6> and TiS_<1.5> is ascribed to the difference in the stability of crystal phase and to the Ti concentration in partially Ti occupied layers of these phases. Sintered bodies with the highest compressive-strength and high density are obtained by hot-pressing TiSe_<1.5> at 1400℃.
社団法人日本セラミックス協会の論文
1988-02-01

TiSe_<1.6>及びTiSe_<1.5>のホットプレス焼結と熱的変化

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