| Green sheets were prepared using tape casting method to characterize thermal barrier property according to thickness control and layer design in functionally graded materials (FGM), which was fabricated by Plasma Activated Sintering(PAS). The prepared green sheets were stacked and then sintered at 1300℃ for 2 min under the pressure of 30 ㎫ in vacuum, which were used for thermal barrier tests. Effect of zirconia layer thickness on thermal barrier property of FGM was observed. In the other type of FGM prepared with the mixed composition of partially stabilized zirconia and monoclinic zirconia, effect of micro-crack and pore in zirconia layer on thermal barrier property of FGM was also observed. After maintaining the surface temperature of zirconia layer at 1500℃ for 20 min, the surface temperature of NiCrAlY layer was measured with thermocouple, in which thermal barrier effect was about 760℃. Thickness variety in zirconia layer and micro-crack and pore in zirconia layer did not affect thermal barrier property. After thermal barrier tests, new type of crack was not investigated in FGM. |
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