Ensuring the Quality of the Surface of Turbine Blades by the Application of Protective Diffusion Coatings

Structural changes and damage of single-crystal turbine blades during life tests of an aviation gas turbine engine

“…These methods can be used to clean the spaces of thermomechanical fatigue cracks, to remove the corundum particles introduced during pneumatic abrasive processing, and to ensure a high quality of the turbine blade surfaces for capillary luminescence con trol of defects [23] and for the deposition of protective diffusion and heat resistant coatings [24].…”

Numerical research of flame propagation conditions in narrow channels using the technology of thermal impulse treatment of turbine blades

“…And at the repair stage -to remove products of high-temperature oxidation and sulfide corrosion Abrasive cleaning of cooling channels in the manufacturing process leads to impregnation of abrasive particles into the surface, which dramatically reduces the quality of protective coatings that are applied (Fig. 1) [1]. The resistance of oxidation products to the effect of acidic and alkaline electrolytes and their high firmness also makes it impossible to use traditional chemical or abrasive methods for their removal [2].…”

“…At the present stage, a limited number of methods are used to clean the surface of the cooling channels of turbine blades. These include: fluorocarbon purification method at temperatures from 815°C to 1000°C [3]; reducing heat treatment in hydrogen at temperatures from 1000°C to 1200°C [1]; hydrothermal treatment in concentrated alkaline solutions and thermochemical treatment in the melt of alkali metal fluorides [5].…”

“…Impregnation of the abrasive particles of corundum into the flow channel of single crystal turbine airfoil of GTE with alloy ZhS26-VI and the formation of defects in the protective coating:(a) surface after preventative treatment; (b) surface after applying ion-plasma coatings[1] …”