セラミックスの模擬粒界相としてのガラスマトリックスからのMgOとAl_2O_3の溶出特性

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Borosilicate glasses containing MgO and Al_2O_3 ((1-x) [0.5Na_2・BO_2O_3・3SiO_2]・xM;x=0.05, M=MgO, Al_2O_3) were used in the present study as a simulated grain boundary phase of Si_3N_4-MgO and Si_3N_4-Y_2O_3/Al_2O_3 ceramics. Leach tests by the bulk glass specimens were carried out under hydrothermal conditions using an autoclave, and the leached layer was observed by EPMA and SEM. A large leaching weight loss and thick leached layer were observed in MgO-containing glasses. Another leach test with the same glass powder based on JIS R 3502 was carried out, and the component leach rate, L (g/cm^2・h) was calculated from the results of leached solution analysis by ICP. The leach rate of MgO, L_<Mgo>=1.23XI0^<-5>g/cm^2・h, was larger than that of Al_2O_3,L_<Al_2O_3>=0.23X10^<-5> g/cm^2・h. Thus, the weight loss and film thickness of leached layer by bulk leach test has been correlated to the component leach rate, that is, leach resistance to water of Al_2O_3-containing glass was superior to that of MgO-containing glass. Results of bulk glass leach tests corresponded well to our previous results on hydrothermal corrosion of Si_3N_4-MgO and Si_3N_4-Y_2O_3/Al_2O_3 ceramics prepared under the same conditions except for the sintering aid; the former showed leach resistance lower than the latter. Thus, the characteristics of grain boundary of ceramics dominate the hydrothermal corrosion and the component leach rates of sintering aids such as MgO and Al_2O_3 play a major role in leaching.
社団法人日本セラミックス協会の論文
1988-02-01

セラミックスの模擬粒界相としてのガラスマトリックスからのMgOとAl_2O_3の溶出特性

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