TY - JOUR
T1 - High-temperature corrosion of spark plasma sintered Gd2SiO5 with volcanic ash for environmental barrier coatings
AU - Kim, Seung Hyeon
AU - Kim, Byung Nam
AU - Nagashima, Nobuo
AU - Matsushita, Yoshitaka
AU - Jang, Byung Koog
N1 - Funding Information:
This work was supported by KAKENHI (Grant Number 19K05016 ) of the Japan Society for the Promotion of Science (JSPS), Japan.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/5
Y1 - 2021/5
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jeurceramsoc.2020.09.001
DO - 10.1016/j.jeurceramsoc.2020.09.001
M3 - Article
AN - SCOPUS:85090979980
VL - 41
SP - 3161
EP - 3166
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 5
ER -