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- W4254453610 abstract "The high-temperature (1500 °C) interactions of two promising dense, polycrystalline EBC ceramics, β-Yb2Si2O7 and β-Sc2Si2O7, with a calcia-magnesia-aluminosilicate (CMAS) glass have been explored as part of a model study. Unlike YAlO3 and γ-Y2Si2O7 in the accompanying Part I paper, little or no reaction is found between the Y-free EBC ceramics and the CMAS. In the case of β-Yb2Si2O7, a small amount of reaction-crystallization product Yb-Ca-Si apatite solid solution (ss) forms, whereas none is detected in the case of β-Sc2Si2O7. The CMAS glass penetrates into the grain boundaries of both EBC ceramics, and they both suffer from a new type of ‘blister’ cracking damage. This is attributed to the through-thickness dilatation-gradient caused by the slow grain-boundary-penetration of the CMAS glass. The success of a ‘blister’-damage-mitigation approach is demonstrated, where 1 vol% CMAS glass is mixed into the β-Yb2Si2O7 powder prior to sintering. The CMAS-glass phase at the grain boundaries promotes rapid CMAS-glass penetration, thereby avoiding the dilatation-gradient." @default.
- W4254453610 created "2022-05-12" @default.
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- W4254453610 date "2018-09-01" @default.
- W4254453610 modified "2023-10-11" @default.
- W4254453610 title "Environmental-barrier coating ceramics for resistance against attack by molten calcia-magnesia-aluminosilicate (CMAS) glass: Part II, β-Yb2Si2O7 and β-Sc2Si2O7" @default.
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- W4254453610 doi "https://doi.org/10.1016/j.jeurceramsoc.2018.03.010" @default.
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