不活性ガス融解法による酸化物系セラミックス中酸素の定量 : 浴金属の効果

概要

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Oxygen in four kinds of oxide ceramics (Y_2O_3, ZrO_2, TiO_2 and Al_2O_3) was determined by the inert gas fusion method. To examine the gas extraction. Fe, Ni, Cu, Sn and Ti were used as a bath metals. From the analytical values and the gas extraction curves, it was considered that the promoting ability of these metals was higher in the order, Ti<Sn<Cu-Ni<Fe. The analytical results of ZrO_2, TiO_2 and Al_2O_3 obtained with Fe (or Ni), Cu and Fe, respectively, did not agree with the theoretical values, though the gas extraction curves showed rapid and complete decomposition. In the crucible after measurement, the metal bath formed a dome. Above results suggest that both bath metal and the sample were pushed up to the top of crucible by the generated CO gas, and that the decomposition was stopped or CO gas was adsorpted on the bath metal, by cooling down of the bath temperature. Use of Sn-Ni or Sn-Fe bath suppressed the dome formation and the analytical results were agreed well with the theoretical values.
社団法人日本セラミックス協会の論文
1993-06-01