溶液-重合を用いたコーディエライト及びヘキサセルシアン前駆体粉末の合成

概要

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Amorphous-type cordierite(2MgO・2Al_2O_3・5SiO_2)and hexacelsian(BaO・Al_2O_3・2SiO_2)precursor powders were prepared by a solution-polymerization route employing a Pechini resin or a PVA solution as a polymeric carrier. After calcination at 800℃ for 1h under atmospheric conditions, the bulky precursors changed into very soft and porous powders. In case of the cordierite precursor prepared using PVA solution, the densification proceeded at lower temperature than in the case of the Pechini resin process. The densification was inhibited by the crystallization of amorphous silica in both cases and it was the reason for the coarse microstructure of the sintered cordierite. Sintered cordierite was closer to pure cordierite with low amount of amorphous-type cordierite phases as was observed in the case of the solution-polymerization route employing PVA solution. Hexacelsian precursor powder, which was prepared by the PVA solution process, was faster crystallized to hexacelsian and showed more sluggish reconstructive transformation behavior than the powder derived from the Pechini resin process.
社団法人日本セラミックス協会の論文
1998-07-01