TY - JOUR
T1 - Thermal shock and fatigue resistance evaluation of functionally graded coating for gas turbine blades by laser heating method
AU - Jian, C. Y.
AU - Hashida, Toshiyuki
AU - Takahashi, Hideaki
AU - Saito, Masahiro
PY - 1995
Y1 - 1995
N2 - This paper presents results of thermal shock and fatigue tests conducted on ZrO2-based thermal barrier coating systems under the temperature environments for advanced gas turbines. A CO2 laser heating method was employed to heat two types of cylindrical specimens with conventional two-layer coating and functionally graded coating. Acoustic emission (AE) signals and temperatures were monitored to detect the fracture process of the coating systems. The measurements of AE signals and temperatures were correlated with the growth of coating delamination. In order to investigate the effects of heating rate and cooling rate on the coating fracture, four different heating/cooling thermal cycles were used in the thermal shock and fatigue tests. Using the AE and temperature results, the fracture process of the coating systems is examined, and the delamination growth rate during fatigue tests is determined. Based on the results, a suitable thermal cycle is determined for an accelerated testing method of the ZrO2-based coating systems. Finally, usefulness of application of functionally graded coating systems is discussed.
AB - This paper presents results of thermal shock and fatigue tests conducted on ZrO2-based thermal barrier coating systems under the temperature environments for advanced gas turbines. A CO2 laser heating method was employed to heat two types of cylindrical specimens with conventional two-layer coating and functionally graded coating. Acoustic emission (AE) signals and temperatures were monitored to detect the fracture process of the coating systems. The measurements of AE signals and temperatures were correlated with the growth of coating delamination. In order to investigate the effects of heating rate and cooling rate on the coating fracture, four different heating/cooling thermal cycles were used in the thermal shock and fatigue tests. Using the AE and temperature results, the fracture process of the coating systems is examined, and the delamination growth rate during fatigue tests is determined. Based on the results, a suitable thermal cycle is determined for an accelerated testing method of the ZrO2-based coating systems. Finally, usefulness of application of functionally graded coating systems is discussed.
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U2 - 10.1016/0961-9526(95)00041-K
DO - 10.1016/0961-9526(95)00041-K
M3 - Article
AN - SCOPUS:0029215504
SN - 1359-8368
VL - 5
SP - 879
EP - 889
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
IS - 7
ER -