エッジインデント試験による8mass%Y_2O_3・ZrO_2遮熱溶射皮膜の高温はく離強度評価

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Thermal barrier coating (TBC) was deposited on Ni based superalloy specimens, where bond coat was NiCoCrAlY by high velocity oxygen fuel (HVOF) spraying and top coat was 8mass% yittria stabilized zirconia (YSZ) by atmospheric plasma spraying. Edge indent tests of the specimens were carried out at a temperature of 1073K by using indenters with apex angles of 85°or 120°and under different displacement speeds. 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 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 were almost the same irrespective of loading speed. The P_d and E_d at 1073K were large when the apex angle of the indenter was large. 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 at 1273K were smaller than those measured at room temperature, which means that the coating with sufficient delamination energy at room temperature can be delaminated more easily at high temperature. The edge-indent method is effective for quantitative evaluation of delamination energy of coating at high temperature as well as room temperature.
社団法人日本材料学会の論文
2006-09-15

エッジインデント試験による8mass%Y_2O_3・ZrO_2遮熱溶射皮膜の高温はく離強度評価

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