Abstract
TiO2 was doped into Er2O3-stabilized ZrO2 (ErSZ) to obtain desirable properties for thermal barrier coating (TBC) applications. The phase composition, thermal conductivity, and mechanical properties of TiO2-doped ErSZ were investigated. ErSZ had a non-transformable metastable tetragonal (t′) phase, the compound with 5 mol % TiO2 consisted of t′ and cubic (c) phases, while 10 mol % TiO2 doped ErSZ had t′, c, and about 3.5 mol % monoclinic (m) phases. Higher TiO2 doping contents caused more m phase, and the compounds were composed of t′ and m phases. When the dopant content was below 10 mol %, TiO2 doping could decrease the thermal conductivity and enhance the toughness of the compounds. At higher doping levels, the compounds exhibited an increased thermal conductivity and a reduction in the toughness, mainly attribable to the formation of the undesirable m phase. Hence, 10 mol % TiO2-doped ErSZ could be a promising candidate for TBC applications.
Highlights
Thermal barrier coatings (TBCs) exert an increasingly significant role as a surface protection technology in the field of modern gas turbines
The most widely used TBCs are made of 7–8 wt.% Y2 O3 -stabilized ZrO2 (YSZ), due to its low thermal conductivity, good phase stability, large thermal expansion, and desirable fracture toughness [1,2,3,4]
Since many diffraction peaks of t0 and c phases are often overlapped in the X-ray diffraction (XRD) patterns, it is difficult to preclude the c phase just according to Figure 1
Summary
Thermal barrier coatings (TBCs) exert an increasingly significant role as a surface protection technology in the field of modern gas turbines. The most widely used TBCs are made of 7–8 wt.% Y2 O3 -stabilized ZrO2 (YSZ), due to its low thermal conductivity, good phase stability, large thermal expansion, and desirable fracture toughness [1,2,3,4]. Since the size of Er3+ is between those of Yb3+ and Y3+ , Er2 O3 -doped ZrO2 (ErSZ) may reveal better comprehensive properties, i.e., good phase stability and high toughness. Research indicates that doping TiO2 into RE2 O3 stabilized ZrO2 can reduce the thermal conductivity, enhance the toughness, and improve the phase stability [25,26,27,28]. The ErSZ powders are synthesized by a chemical co-precipitation method, and the pellets for property measurements are produced by a solid state reaction and sintering method
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