Thermal stability of a synthetic sand composition, which was developed as a simulant for calcium–magnesium aluminosilicate (CMAS) turbine
deposits, was characterized using thermogravimetric and differential thermal analysis (TG/DTA). The sand was melted into CMAS glass, which
had a composition of 23.3CaO–6.4MgO–3.1Al2O3–62.5SiO2–4.1Na2O–0.5K2O–0.04Fe2O3 (mol.%), determined by inductively coupled plasma
atomic emission spectroscopy (ICP-AES).Bulk density ofthe glass was measured to be 2.63 g/cm3, and the Young’s and shear moduli were 84.3 GPa
and 33.6 GPa, respectively, along with a Poisson’s ratio of 0.26. Vickers microhardness and indentation fracture toughness were determined to be
6.14 ± 0.1 GPa and 0.70 ± 0.05 MPa m1/2, respectively. Glass transition temperature, softening point and coefficient of thermal expansion of the
glass were measured by dilatometry. Glass viscosities were estimated over a temperature range of 600–1500 ◦C using dilatometric reference points
of the glass and from composition-based methods. Times required for infiltration of molten CMAS glass into thermal or environmental barrier
coatings were also estimated.
Published by Elsevier Ltd.
Thermal stability of a synthetic sand composition, which was developed as a simulant for calcium–magnesium aluminosilicate (CMAS) turbinedeposits, was characterized using thermogravimetric and differential thermal analysis (TG/DTA). The sand was melted into CMAS glass, whichhad a composition of 23.3CaO–6.4MgO–3.1Al2O3–62.5SiO2–4.1Na2O–0.5K2O–0.04Fe2O3 (mol.%), determined by inductively coupled plasmaatomic emission spectroscopy (ICP-AES).Bulk density ofthe glass was measured to be 2.63 g/cm3, and the Young’s and shear moduli were 84.3 GPaand 33.6 GPa, respectively, along with a Poisson’s ratio of 0.26. Vickers microhardness and indentation fracture toughness were determined to be6.14 ± 0.1 GPa and 0.70 ± 0.05 MPa m1/2, respectively. Glass transition temperature, softening point and coefficient of thermal expansion of theglass were measured by dilatometry. Glass viscosities were estimated over a temperature range of 600–1500 ◦C using dilatometric reference pointsof the glass and from composition-based methods. Times required for infiltration of molten CMAS glass into thermal or environmental barriercoatings were also estimated.Published by Elsevier Ltd.
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