前駆体繊維化法によるNa_<1-x>Ti_<2+x>Al_<5-x>O_<12>(X=O.2)系繊維の合成

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Na_<1-x>Ti_<2+x>Al_<5-x>O_12 system continuous fibers were prepared by firing precursor fibers which were spun from aqueous solution of Al(NO_3)_3-Al(OPr^i)_3-Ti(OPr^i)_4-Na_2CO_3-Citric acid (and Oxalic acid) system (Method A-a and A-b) and AlCl_3-Al(OPr^i)_3-Ti (OPr^i)_4-Na_2CO_3-Citric acid (and Oxalic acid) system (Method B-a and B-b). Spinnable composition range of the solution enclosed with index of Al(OPr^i)_3 mol/(Al(NO_3)_3 mol or AlCl_3 mol) and Citric acid mol/(Al+Ti)mol became broader as oxalic acid content increases. When the precursor fiber in method A was fired, freudenbergit and Na-β"-alumina appeared at 800℃, and in addition to these, α-alumina and rutile appeared at 1000℃. On the other hand, in method B, sodium oxide appeared at 400℃, and anatase, rutile, freudenbergit and Na-β"-alumina at 800℃. It is considered that the reaction rate in method A may be faster than that in method B interpreting from the grown phase. When the precursor fiber obtained from method A-b was fired at 1100℃ for 5 h, NTAO phase became dominant, and grown phase reached equilibrium at 1300℃, although unreacted phase still remained. It was found that preparation at a low temperature compared to usual solid phase reaction was possible. The fiber heat treated at 1000℃ had dense surface. As the heat treating temperature was raised, the fiber appearance changed to aggregation of deep grooves and slender particles, then to porous surface. When the fiber was fired at 1350℃, its morphorogy turned to aggregation of spherical particles having diameter of several μm. This may be considered to be the result that NTAO phase grown as nucleation point which was deposited intermediate by heteronucleation occured at lower heat treatment.
社団法人日本セラミックス協会の論文
1992-06-01

前駆体繊維化法によるNa_<1-x>Ti_<2+x>Al_<5-x>O_<12>(X=O.2)系繊維の合成

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