열차폐 코팅 두께에 따른 열적 내구성 평가
Thermal Durability Evaluation for the Coating Thickness of Thermal Barrier Coatings
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The effects of the coating thickness on the thermal stability of thermal barrier coatings (TBCs) were investigated using furnace cyclic thermal fatigue (FCTF) tests. A bond coat with a double-layer structure was deposited on stainless steel (SUS 304) using a high-velocity oxygen fuel (HVOF) and air plasma spray (APS) method with Ni-Cr-based MCrAlY feedstock powder. The top coat was applied onto the bond coat using APS with yttria-stabilized zirconia (YSZ). After a FCTF test at 1100 ℃ for 1143 cycles, the microstructure in the TBCs specimen showed a good condition without cracking and delamination. In contrast, the bond coat was partially oxidized, and a thermally grown oxide (TGO) layer was observed at the interface between the top and the bond coats. For TBCs with a thinner top coat and a thicker bond coat, a thicker TGO layer was formed. However, increasing the thickness of the top coat decreased the bond coat thickness.
Abstract
The effects of the coating thickness on the thermal stability of thermal barrier coatings (TBCs) were investigated using furnace cyclic thermal fatigue (FCTF) tests. A bond coat with a double-layer structure was deposited on stainless steel (SUS 304) using a high-velocity oxygen fuel (HVOF) and air plasma spray (APS) method with Ni-Cr-based MCrAlY feedstock powder. The top coat was applied onto the bond coat using APS with yttria-stabilized zirconia (YSZ). After a FCTF test at 1100 ℃ for 1143 cycles, the microstructure in the TBCs specimen showed a good condition without cracking and delamination. In contrast, the bond coat was partially oxidized, and a thermally grown oxide (TGO) layer was observed at the interface between the top and the bond coats. For TBCs with a thinner top coat and a thicker bond coat, a thicker TGO layer was formed. However, increasing the thickness of the top coat decreased the bond coat thickness.
참고문헌 (18)
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