TY - JOUR
T1 - Effect of moisture on the oxidation behavior of ZrB2
AU - Naraparaju, Ravisankar
AU - Maniya, Keyur
AU - Murchie, Alec
AU - Fahrenholtz, William G.
AU - Hilmas, Gregory E.
N1 - Publisher Copyright:
© 2020 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society (ACERS)
PY - 2021/2
Y1 - 2021/2
N2 - Oxidation studies of ZrB2 were performed under wet air and dry air conditions at 1200°C, 1400°C, and 1500°C for 1, 4, and 10 h. Compared to dry air, the presence of water vapor was found to enhance the oxidation kinetics by a factor of 7 to 30, depending on the temperature. Thermodynamic calculations suggested that water vapor promoted the formation of additional volatile species such as boric acid (HBO2), in addition to boria (B2O3) produced in dry air, which increased the evaporation rate of B2O3. Compared to dry air, the presence of water vapor leads to more rapid evaporation of boria and the transition from parabolic oxidation kinetic behavior (ie, rate controlled by diffusion through boria) to linear (ie, underlying ZrB2 is directly exposed to the oxidizing environment) at shorter times and lower temperatures.
AB - Oxidation studies of ZrB2 were performed under wet air and dry air conditions at 1200°C, 1400°C, and 1500°C for 1, 4, and 10 h. Compared to dry air, the presence of water vapor was found to enhance the oxidation kinetics by a factor of 7 to 30, depending on the temperature. Thermodynamic calculations suggested that water vapor promoted the formation of additional volatile species such as boric acid (HBO2), in addition to boria (B2O3) produced in dry air, which increased the evaporation rate of B2O3. Compared to dry air, the presence of water vapor leads to more rapid evaporation of boria and the transition from parabolic oxidation kinetic behavior (ie, rate controlled by diffusion through boria) to linear (ie, underlying ZrB2 is directly exposed to the oxidizing environment) at shorter times and lower temperatures.
KW - oxidation
KW - ultra-high temperature ceramics
KW - zirconia
UR - http://www.scopus.com/inward/record.url?scp=85092342814&partnerID=8YFLogxK
U2 - 10.1111/jace.17500
DO - 10.1111/jace.17500
M3 - Article
AN - SCOPUS:85092342814
SN - 0002-7820
VL - 104
SP - 1058
EP - 1066
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 2
ER -