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Thermal barrier coating material (TBC) is applied to gas turbine blades

Thermal barrier coating material (TBC) is applied to gas turbine blades


Thermal barrier coating material (TBC) is applied on the surface of gas turbine blades and other high-temperature components. To provide to its important role in heat insulation of a porous ceramic coating is applied most widely TBC system is prepared by adopting the method of atmospheric plasma spraying (APS), make the yttrium stabilized zirconia (YSZ) in high temperature alloy surface structure of porous coating won the TBC with complex microstructure, for its thermal and mechanical aspects of performance has an important role with the continuous development of gas turbine, the influence of the continuous improvement of its working temperature, various aspects of TBC performance also put forward higher request, the thermal conductivity is a crucial parameter Therefore, the influence of TBC preparation process on its microstructure and thermal conductivity has received a lot of attention and research.

Kulkarni et al. systematically studied the influence of the state of the original powder in spraying (including particle size, particle temperature, flight rate, etc.) and the deposition state (base temperature, impact Angle) on the structure and performance of TBC. Kulkarni et al. analyzed the influence of the original powder morphology on TBC thermal conductivity and mechanical properties. Chi et al. discussed the influence of thermal cycle on TBC performance, and explained that the different original morphology of the coating would lead to different sintering characteristics in the high-temperature working environment, so its morphology design is very noteworthy. However, these studies have not focused on the effect of APS spraying distance on TBC microstructure and thermal conductivity.

1) when the spraying distance increases, the content of spherical pores increases significantly, while the content of horizontal and vertical cracks decreases relatively. In general, the porosity increases and leads to the decrease of thermal conductivity.


2) for the specific influence of different porosity ratios on thermal conductivity, an iterative model can be used to roughly estimate the relationship between vent ratio and thermal conductivity.

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Ytteium zirconium powder sprayed by plasma spraying

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Tel:0371-66115302

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E-mail:shanghai@zz-zirconia.com

Zhengzhou Zhenzhong Fused New Material Co. Ltd.

Xinmi Henan Province P.R.C 452384

Web:www.zz-zirconia-YSZ.com


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