Measurement of delamination strength of thermal barrier coating at high temperature by edge-indent test

Thermal barrier coating (TBC) was carried out on Ni based super-alloy specimens, and edge indent tests were carried out at 1073K under different displacement rate. In addition, the specimens were heated and held at 1273K for long time, and the edge-indent tests of the specimens were performed both at 1273K and at room temperature. The results showed that the delamination load P-d and the delamination energy E-d measured at 1073K after short time holding were larger than those measured at room temperature, and the P-d and E-d slightly decreased with increasing displacement rate at 1073K while they slightly increased at 293K. The P-d and E-d at 1273K increased with increasing holding time and reached a maximum at 1400ks. With further increase in holding time, the P-d and E-d largely decreased. The P-d and E-d measured at 1273K were smaller than those at room temperature.