Abstract
Yb2SiO5 is one of the most potential candidate materials for thermal/environmental barrier coating (T/EBC). In order to further reduce its thermal conductivity and improve its mechanical properties, a series of Gd doped Yb2SiO5 [(Yb1-xGdx)2SiO5] ceramics were prepared. The effects of Gd doping on the phase composition, mechanical properties, thermal conductivity and microstructural evolution of Gd doped Yb2SiO5 were investigated. The results showed that (Yb1-xGdx)2SiO5 still maintained a single Yb2SiO5 phase. The average fracture toughness of (Yb1-xGdx)2SiO5 ceramics first decreased and then increased in the investigated Gd-doped Yb2SiO5 samples. (Yb0.9Gd0.1)2SiO5 had the highest fracture toughness (2.56 MPa ·m1/2), which was about 30% higher than that of pure Yb2SiO5. Thermal conductivity of (Yb0.9Gd0.1)2SiO5 ceramic (1.47 W∙m-1∙K-1 at 1200 °C) was about 15% lower than that of pure Yb2SiO5. (Yb1-xGdx)2SiO5 (x≤0.4) had good phase stability after sintering at 1550 °C for 100 h. However, a small amount of Gd9.33(SiO4)6O2 and Yb2Si2O7 two new phases were generated besides Yb2SiO5 phase in the sintered (Yb0.5Gd0.5)2SiO5. Taken together, (Yb0.9Gd0.1)2SiO5 ceramic material will be one of potential candidates for T/EBC.
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