Synthesis of rare earth silicate thermal barrier coating materials (YxYb2-xSiO5) and application on the surface of titanium alloy

Rare earth (RE) silicates are promising candidates for thermal barrier coating (TBC) materials. In this work, RE silicate thermal barrier coating materials Y x Yb 2-x SiO 5 were prepared by solid state reaction at high temperature. The RE silicate samples were used for the TBCs on the titanium alloy (TC4) by atmospheric plasma spraying (APS). The thermal shock resistance of RE silicate coatings deposited on TC4 substrate was tested by water quenching, and compared with that of traditional yttria-stabilized zirconia (YSZ) coating. The thermodynamic tests show that RE silicate has lower thermal conductivity, uniform thermal expansion coefficient (TEC). Thermal shock resistance life of Y 0.4 Yb 1.6 SiO 5 sample is almost 20% higher than traditional materials. The prepared RE silicate TBC materials (Y x Yb 2-x SiO 5 ) exhibit great potential for application in thermal protection of titanium alloys.