アルミナコーティング炭酸カルシウム-水酸化カルシウム混合粉末を焼結したカルシアセラミックスの耐消化性

概要

論文の詳細を見る
CaCO_3-Ca (OH)_2 mixed powders, coated with a chelate compound of aluminum corresponding to 0-0.5 Mass% Al_2O_3, were sintered at 1500℃ for 2h in order to obtain CaO ceramics. The relative density was 95% for Al_2O_3-free CaO ceramics obtained from the 29 mol% CaCO_3-71 mol% Ca(OH)_2 mixed powder. On the other hand, a low density of 86% was found in the CaO ceramics prepared from 100% CaCO_3 powder. The mass gain of Al_2O_3-free CaO ceramics and 100% CaCO_3 powder was about 40% and 80%, respectively, according to a slaking-resistance test of 360 h under 95% relative humidity at 50℃. The sinterability and slaking resistance of CaO ceramics prepared from CaCO_3-Ca (OH)_2 mixed powder were remarkably increased compared with those prepared from CaCO_3 powder. The relative density and mass gain after slaking-resistance test were 97 and 12%, respectively, for the CaO ceramics prepared from the 29 mol% CaCO_3-71 mol% Ca (OH)_2 mixed powder coated with 0.01 mass% Al_2O_3. The trace amount of Al_2O_3 coating on the starting powder led to an improvement of slaking resistance of CaO ceramics prepared from CaCO\3-Ca(OH)_2 mixed powder. The slaking-resistance of CaO ceramics prepared by Al_2O_3 coating method was higher than that obtained by conventional mixing of Al_2O_3 powder.
社団法人日本セラミックス協会の論文
1998-11-01