Abstract
AbstractPressureless sintering of pure γ‐Y2Si2O7 powders that had been synthesized by a solid‐liquid reaction method using Y2O3 and SiO2 powders with Li2O, MgO, and Al2O3 additives was reported. The sintering kinetics of γ‐Y2Si2O7 powders was analyzed to track details of densification evolution. Apparent activation energies of the densification of γ‐Y2Si2O7 powders were reported for the first time, which was 57.1, 96.6, and 100.2 kJ/mol for the powders with Li2O, MgO, and Al2O3 additives, respectively, indicating that Li2O could promote the densification behavior effectively. The flexural strengths as a function of temperature for the γ‐Y2Si2O7 ceramics with different additives were also investigated. The degradation of high‐temperature flexural strength was mainly ascribed to the softening of grain‐boundary glassy phase. γ‐Y2Si2O7 specimens fabricated using the powders with MgO or Al2O3 additives exhibited better high‐temperature mechanical properties.
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