TUTCRIS

TY - JOUR

T1 - Effect of melting state on the thermal shock resistance and thermal conductivity of APS ZrO2-7.5wt.% Y2O3 coatings

AU - Song, Xuemei

AU - Liu, Ziwei

AU - Suhonen, Tomi

AU - Varis, Tommi

AU - Huang, Liping

AU - Zheng, Xuebin

AU - Zeng, Yi

PY - 2015/5/25

Y1 - 2015/5/25

N2 - The microstructures of two types of ZrO2-7.5wt.% Y2O3 (YSZ) coatings fabricated by air plasma spraying (APS) but containing different amounts of columnar grains were investigated through scanning electron microscopy and electron backscatter diffraction analysis. Differences in the formation mechanisms of columnar and equiaxed grains were characterized using particles collected in a water container, from which it was found that these mechanisms are closely related to the melted state of the in-flight particles. Furthermore, it was found that the higher the columnar grain concentration of an as-sprayed coating, the higher its thermal shock resistance. This means that it is possible to improve the thermal shock resistance of APS YSZ coatings simply by introducing more columnar grains, as this increases their thermal conductivity. Using this knowledge, YSZ coatings with good thermal shock resistance and a thermal conductivity of 0.81W·(m·K)-1 at 1100°C were successfully prepared.

AB - The microstructures of two types of ZrO2-7.5wt.% Y2O3 (YSZ) coatings fabricated by air plasma spraying (APS) but containing different amounts of columnar grains were investigated through scanning electron microscopy and electron backscatter diffraction analysis. Differences in the formation mechanisms of columnar and equiaxed grains were characterized using particles collected in a water container, from which it was found that these mechanisms are closely related to the melted state of the in-flight particles. Furthermore, it was found that the higher the columnar grain concentration of an as-sprayed coating, the higher its thermal shock resistance. This means that it is possible to improve the thermal shock resistance of APS YSZ coatings simply by introducing more columnar grains, as this increases their thermal conductivity. Using this knowledge, YSZ coatings with good thermal shock resistance and a thermal conductivity of 0.81W·(m·K)-1 at 1100°C were successfully prepared.

KW - Air plasma spraying

KW - Columnar grains

KW - Thermal conductivity

KW - Thermal shock resistance

KW - YSZ coatings

UR - http://www.scopus.com/inward/record.url?scp=84927174189&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2015.03.011

DO - 10.1016/j.surfcoat.2015.03.011

M3 - Article

VL - 270

SP - 132

EP - 138

JO - Surface & Coatings Technology

JF - Surface & Coatings Technology

SN - 0257-8972

ER -