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The leaching behavior of Y2O3-Al2O3-SiO2 glasses was studied in connection with the hydrothermal corrosion of Si3N4-Y2O3/Al2O3 ceramics. Leaching tests were conducted with the glass blocks under hydrothermal conditions at 300°C for 1 to 10 days. It was found that the weight loss of the glasses is less than 0.8mg/cm2 after 10 days and the durability of the glasses is higher than that of SiO2 glass, Corning-1723 glass and Si3N4-Y2O3/Al2O3 ceramics. It was considered that the higher durability of the glass under hydrothermal conditions is due to the lower leach rates of Y2O3 and Al2O3.

nihon seramikkusu kyoukai gakujyutsu rombunshi/nippon seramikkusu kyōkai gakujutsu rombunshi

Properties of Y&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-SiO&lt;sub&gt;2&lt;/sub&gt; Glasses as a Model System of Grain Boundary Phase of Si&lt;sub&gt;3&lt;/sub&gt;N&lt;sub&gt;4&lt;/sub&gt; Ceramics (Part 2)