Abstract
Green sheets for ZrO 2/NiCrAlY functionally graded material (FGM) were prepared using tape casting in order to control thickness and layer design in FGM. The prepared green sheets were stacked and then sintered by plasma activated sintering (PAS) at 1300 °C for 2 min under the pressure of 30 MPa in vacuum. The sintered parts were used for thermal barrier tests. The effect of thickness of the ZrO 2 layer on thermal barrier property of FGM was studied. The effects of micro-cracks and pores in ZrO 2 layer on thermal barrier property of FGM were studied in FGMs prepared with the mixed composition of partially stabilized zirconia (PSZ) and monoclinic zirconia (m-ZrO 2) in ZrO 2 layer. After maintaining the surface temperature of ZrO 2 layer at 1500 °C for 20 min, the surface temperature of NiCrAlY layer was measured with thermocouple, indicating that thermal difference (Δ T) between two surfaces was about 760 °C. Thickness variation, micro-cracks and pores in ZrO 2 layer did not affect thermal barrier property. However, micro-cracks and pores in ZrO 2 layer showed the release of stress concentration in ZrO 2 layer. After thermal barrier tests, new type of crack was not investigated in FGM.
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