TY - JOUR
T1 - Time-/space-sensitive sintering kinetics of plasma sprayed multi-modal nanostructured coating
AU - Wang, Y.
AU - Bai, Y.
AU - Wu, Kai
AU - Zhou, J.
AU - Fan, W.
AU - Kang, Y. X.
AU - Liu, Q.
AU - Li, T. Q.
AU - Hu, Y. B.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - Sintering is considered to be one of the main reasons that accelerate performance degradation and shorten lifetime of thermal barrier coatings (TBCs). The anti-sintering design and underlying sintering kinetics are of great importance for optimizing the microstructure of TBCs. In this study, the competitive sintering of a novel multi-modal nanostructured coating is systematically studied by a burner-rig test. The results suggested that, due to the coexistence of unmelted nanozone, amorphous area and recrystallized region, the sintering behavior of nanostructured coating exhibited obvious time-/space-sensitive effects. Time-sensitive feature was initially associated with the coalescence growth of nano-particles and healing of micro-pores within the unmelted nanozone. Subsequently, the sintering was accompanied by the abnormal growth of grains in the unmelted nanozone and the formation of multi-contact neck in the recrystallized region. The diffusion-driven stiffening of recrystallized region promoted the stage-progressive enhancement of elastic modulus. The space-sensitive sintering kinetics caused the spontaneous formation and evolution of multi-scale cracks at the unmelted nanozone/recrystallized region interface.
AB - Sintering is considered to be one of the main reasons that accelerate performance degradation and shorten lifetime of thermal barrier coatings (TBCs). The anti-sintering design and underlying sintering kinetics are of great importance for optimizing the microstructure of TBCs. In this study, the competitive sintering of a novel multi-modal nanostructured coating is systematically studied by a burner-rig test. The results suggested that, due to the coexistence of unmelted nanozone, amorphous area and recrystallized region, the sintering behavior of nanostructured coating exhibited obvious time-/space-sensitive effects. Time-sensitive feature was initially associated with the coalescence growth of nano-particles and healing of micro-pores within the unmelted nanozone. Subsequently, the sintering was accompanied by the abnormal growth of grains in the unmelted nanozone and the formation of multi-contact neck in the recrystallized region. The diffusion-driven stiffening of recrystallized region promoted the stage-progressive enhancement of elastic modulus. The space-sensitive sintering kinetics caused the spontaneous formation and evolution of multi-scale cracks at the unmelted nanozone/recrystallized region interface.
KW - Multi-modal nanostructure
KW - Structural evolution
KW - Thermal shock resistance
KW - Time-/space-sensitivity
KW - Yttria partially stabilized zirconia
UR - https://www.scopus.com/pages/publications/85075466507
U2 - 10.1016/j.surfcoat.2019.125115
DO - 10.1016/j.surfcoat.2019.125115
M3 - 文章
AN - SCOPUS:85075466507
SN - 0257-8972
VL - 381
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 125115
ER -