TY - GEN
T1 - Hot corrosion of potential thermal barrier coating material (Sm 1-xYbx)2Zr2O7ByV 2O5and Na2So4
AU - Ouyang, Jia Hu
AU - Li, Sa
AU - Liu, Zhan Guo
AU - Zhou, Yu
PY - 2011
Y1 - 2011
N2 - (Sm1-xYbx)2Zr2O7 (x = 0, 0.5, 1.0) powders are prepared by chemical-coprecipitation and calcination method, and then pressureless-sintered at 1700°C for 10 h. Sm 2Zr2O7 has a pyrochlore-type structure, while SmYbZr2O7 and Yb2Zr2O7 have a defect fluorite-type structure. Thermal expansion coefficient and thermal diffusivity of (Sm1-xYbx2Zr2O7 are studied by a high-temperature dilatometer and a laser flash diffusivity technique from room temperature to 1400°C Hot corrosion tests between (Sm1-xYbx)2Zr2O7 and three corrosive agents including V2O5, Na 2SO4, and a V2O5+Na 2SO4 mixture, are carried out from 600 to 1100°C for 2 h and 8 h in air, respectively. Different reaction products of ZrV 2O7, LnVO4 and m-ZrO2 are identified depending upon the hot corrosion conditions, for example, ZrV2O 7 and corresponding LnVO4 at 600°C for 2 h and 8 h, namely SmVO4, (Sm,Yb)VO4, YbVO4, respectively; ZrV2O7, m-ZrO2 and InVO4 at 700°C for 2 h; m-ZrO2 and LnVO4 either at 800-1100°C for 2 h or at 700-1100°C for 8 h. No reaction products are identified on Na2SO4-coated (Sm1-xYb x)2Zr2O7 at 900-1100°C. However, m-ZrO2 and corresponding LnVO4 are found after (Sm 1-xYbx)2Zr2O7 exposed to Na2SO4+V2O5 (mole ratio = 1:1) at temperatures of 600-1100°C. Those results are explained based on phase diagram theory, and the principles for crystal growth are used to illustrate the morphologies of reaction products LnVO4.
AB - (Sm1-xYbx)2Zr2O7 (x = 0, 0.5, 1.0) powders are prepared by chemical-coprecipitation and calcination method, and then pressureless-sintered at 1700°C for 10 h. Sm 2Zr2O7 has a pyrochlore-type structure, while SmYbZr2O7 and Yb2Zr2O7 have a defect fluorite-type structure. Thermal expansion coefficient and thermal diffusivity of (Sm1-xYbx2Zr2O7 are studied by a high-temperature dilatometer and a laser flash diffusivity technique from room temperature to 1400°C Hot corrosion tests between (Sm1-xYbx)2Zr2O7 and three corrosive agents including V2O5, Na 2SO4, and a V2O5+Na 2SO4 mixture, are carried out from 600 to 1100°C for 2 h and 8 h in air, respectively. Different reaction products of ZrV 2O7, LnVO4 and m-ZrO2 are identified depending upon the hot corrosion conditions, for example, ZrV2O 7 and corresponding LnVO4 at 600°C for 2 h and 8 h, namely SmVO4, (Sm,Yb)VO4, YbVO4, respectively; ZrV2O7, m-ZrO2 and InVO4 at 700°C for 2 h; m-ZrO2 and LnVO4 either at 800-1100°C for 2 h or at 700-1100°C for 8 h. No reaction products are identified on Na2SO4-coated (Sm1-xYb x)2Zr2O7 at 900-1100°C. However, m-ZrO2 and corresponding LnVO4 are found after (Sm 1-xYbx)2Zr2O7 exposed to Na2SO4+V2O5 (mole ratio = 1:1) at temperatures of 600-1100°C. Those results are explained based on phase diagram theory, and the principles for crystal growth are used to illustrate the morphologies of reaction products LnVO4.
UR - https://www.scopus.com/pages/publications/82355172656
M3 - 会议稿件
AN - SCOPUS:82355172656
SN - 9781118059883
T3 - Ceramic Engineering and Science Proceedings
SP - 109
EP - 128
BT - Advanced Ceramic Coatings and Materials for Extreme Environments - A Collection of Papers Presented at the 35th International Conference on Advanced Ceramics and Composites, ICACC
T2 - Advanced Ceramic Coatings and Materials for Extreme Environments - 35th International Conference on Advanced Ceramics and Composites, ICACC
Y2 - 23 January 2011 through 28 January 2011
ER -