Hot corrosion behavior was evaluated by gadolinium monosilicate (Gd2SiO5) with volcanic ash for environmental barrier coatings (EBCs). Sintered Gd2SiO5 was prepared by the spark plasma sintering (SPS) method at 1400 °C for 20 min, and high-temperature corrosion resistance against of volcanic ash was evaluated at 1400 °C for 2 h, 12 h, and 48 h. The surface region of sintered Gd2SiO5 was partially dissolved in molten volcanic ash, creating a chemically reacted area. The formation of the elongated morphology of Ca2Gd8(SiO4)6O2 grains observed in the reaction area is thicker with increasing heat-treatment time as the volcanic ash dissolves. In addition, high-temperature X-ray diffraction was carried out to identify the dynamics of phase evaluation in the volcanic ash and Gd2SiO5. According to the results, corrosion occurs due to reaction of the Gd2SiO5 phase and the Ca component of volcanic ash at 1300 °C, and the Ca2Gd8(SiO4)6O2 phase is generated.
|Number of pages||6|
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - May 2021|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry