Anti-CMAS (aa 69-384) polyclonal antibody

Calcium-magnesium-alumina-silicate (CMAS) has posed enormous threat to thermal barrier coatings (TBCs). In this study, a series of newly developed TBC ceramics, BaLn(2)Ti(3)O(10) (Ln=La, Nd), are found to have high resistance to the penetration of molten CMAS at 1250 degrees C. The formation of a continuous, dense crystalline layer, mainly composed of apatite and CaTiO3 phases, on the sample surfaces contributed to this desirable attribute. The accumulation of Ba in the molten CMAS triggered the crystallization of the melt, leading to the formation of many BaAl2Si2O8 celsian crystals above the crystalline layer, which could reduce the mobility of the molten CMAS. The mechanisms by which the CMAS attacks BaLn(2)Ti(3)O(10) samples are discussed. The results indicate that Ba is an effective element for altering CMAS composition, and doping Ba in TBCs might be an attractive way of mitigating CMAS attack.

Dense Yb2SiO5 and three types of Yb2SiO5-YSZ composite specimens, as an environmental barrier coating, were prepared using pressureless sintering process at 1600 degrees C for 10 h. Hot corrosion behaviors of the sintered specimens were investigated in the presence of calcium-magnesium-aluminosilicate (CMAS) at 1400 degrees C for 4, 8, 24 and 48 h. Phase change identification, cross-sectional microstructure, reaction layer thickness, and elemental distribution, of the different samples during hot corrosion was investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) equipped by EDS. Mechanical properties of synthesized samples include elastic modulus, hardness and microhardness were measured by the nanoindentation method. The results showed that the reaction layer of all composite samples was smaller than that of the Yb2SiO5 sample. Formation of dense Al5Yb3O12 and Al5Y3O12 phases in the reaction layer can reduce the infiltration of molten CMAS into the samples, which mean better hot corrosion resistance of composite samples. Yb2SiO5-30 wt%YSZ composite sample showed better performance in contrast to the composite samples because of the high concentration of dissolved Y3+ ion in the glassy CMAS which promotes the formation of the barrier oxide phases (Ca2Al2SiO2, Ca3ZrSi2O9) and protective garnet phases (Al5Yb3O12) in the reaction layer.