Effect of spraying power on microwave dielectric properties of rare earth element doped zirconia coatings
Using Yb2O3 , Gd2O3 , Y2O3 and ZrO2 as raw materials, zirconia ceramic powder doped with ytterbium, gadolinium and yttrium ( YGYZ ) was synthesized by solid-phase reaction method, and YGYZ coating was prepared by plasma spraying technology under different spraying powers. The effects of the spraying power on the microstructure, phase composition, porosity, dielectric constant and mechanical properties of the coating were systematically investigated. The results show that with the increase of the spraying power, the internal stress is generated in the coating, the density and dielectric constant of the coating increase, and the porosity, dielectric loss and microhardness of the coating decrease. When the spraying power is 65 kW, the microwave dielectric constant of the coating is the smallest ( 13. 31) , and the corresponding dielectric loss is 3. 8×10-2. The zirconia coating doped with ytterbium, gadolinium and yttrium rare earth elements has a low dielectric constant and high thermal stability, which has great potential in the field of aero engines.
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