Transformation kinetics in plasma-sprayed barium- and strontium-doped aluminosilicate (BSAS)

The hexacelsian-to-celsian phase transformation in Ba_(1–x)Sr_xAl_2Si_2O_8 is of interest for environmental barrier coating applications. Plasma-sprayed microstructures were heat treated above 1100 °C and the kinetics of the hexacelsian-to-celsian transformation were quantified. Activation energies for bulk and crushed materials were determined to be ∼340 and ∼500 kJ mol^(−1), respectively. X-ray diffraction and electron backscattered diffraction were used to establish how plasma spraying barium- and strontium-doped aluminosilicate effectively reduces the energy required for its transformation.