ナトリウムアルミニウムケイ酸塩-アルカリ炭酸塩混合系における熱的安定性

概要

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The thermal stability of solium aluminium silicates and their reactivity to alkali carbonates were investigated in view of their application as CO_2 gas sensors. A nepheline phase was very stable, since the peak position of the X-ray diffraction pattern was hardly influenced by either heat treatment or humidification up to 800℃. A distorted carnegieite phase (like-carnegieite) transformed into the nepheline phase at 500℃ under a humid condition, while under a dry condition, it was stable up to 800℃ but transformed into the nepheline phase at 900℃. For mixtures with alkali carbonates, the nepheline phase was most stable even under the humid condition at temperatures below 500℃. When the mixtures were heated at 600℃, the nepheline phase reverted to the like-car-negieite phase and alkali silicates, such as Na_2SiO_3, Li_2SiO_3 and Li_4SiO_4, formed as by-products. For Na_2O-Al_2O_3-4SiO_2 sintering mixtures with Li_2CO_3, the like-carnegieite phase transformed into the nepheline phase at 500℃. The nepheline phase was stable up to 1000℃ even under the humid condition and Li_2SiO_3 formed as a byproduct.
社団法人日本セラミックス協会の論文
2005-04-01