A method for plugging surface micropores during thermal spraying

A surface microporous, thermal spraying technology, applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problem of gas film hole blockage, etc., and achieve the effect of easy removal

Active Publication Date: 2018-06-01
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the object of the present invention is to provide a method for plugging surface micropores in the process of thermal spraying, so as to solve the problem of gas film hole blockage in the preparation process of the surface coating of gas turbine blades.

Method used

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  • A method for plugging surface micropores during thermal spraying
  • A method for plugging surface micropores during thermal spraying
  • A method for plugging surface micropores during thermal spraying

Examples

Experimental program
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Embodiment 1

[0025] The MCrAlY bonding layer and TBC ceramic top layer were prepared by atmospheric plasma spraying (APS) to form a typical thermal barrier coating (TBC) structure. The spraying parameters are shown in Table 1. 304 stainless steel was used as the base material in this experiment. Before spraying, pre-treat the substrate, sand the substrate with fine sandpaper, and then scrub the substrate with acetone. The MCrAlY type coating layer is used as the high temperature oxidation resistance and TBC transition layer, and the coating material is gas atomized Ni-based superalloy Ni-23Co-20Cr-8.5Al-5.0Ta-0.6Y (Sulzer-Metco Amdry 997) powder. The ceramic coating uses 8wt% yttrium oxide (Y 2 o 3 ) stabilized zirconia 8YSZ (Metco 204B-NS, Sulzer Metco Inc., New York, USA), particle size distribution: -75+45 μm, the powder is an agglomerated powder with a hollow spherical structure (HOSP).

[0026] Table 1 Parameters of APS sprayed bonding layer and ceramic layer

[0027]

[0028] ...

Embodiment 2

[0034] The MCrAlY bonding layer and the TBC ceramic top layer were prepared by atmospheric plasma spraying (APS) to form a typical thermal barrier coating (TBC) structure, and the coating preparation was the same as in Example 1.

[0035] The shape of the occluder is at an oblique angle of 45°, the occlusion heights are 1, 2, and 3mm respectively, and the spraying direction is at an angle of 30° to the normal line of the substrate. The coating deposition characteristics under the shaded area and the unshielded area are as follows: image 3 middle Figure 3a , Figure 3b and image 3 c and shown in Table 4 and Table 5. It can be seen that when the spraying direction is changed to an angle of 30°, the coating morphology on the left and right sides of the same shield is quite different. The topography of the coating edge on the left appears steeper compared to the one on the right. The coating morphology changes on the same side of the substrate under different shading heigh...

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Abstract

The invention provides a blocking method for surface micro holes in the thermal spraying process. In the process of spraying coatings, a T-shaped shielding part is located on a blade cooling hole, and the included angle between the side edges of the T-shaped shielding part and a spraying ion beam and the vertical distance between the upper bottom surface of the T-shaped shielding part and the surfaces of blades are adjusted so that the coatings cannot deposit on a base body under a shielding area and hole blockage can be avoided. The method is characterized in that the shielding part is adopted for blockage, the operation is simple and flexible, and the influence from limitation of the shapes of the surface holes is avoided; the shielding part is easy and convenient to install and disassemble and does not cause damaging or peeling of the coatings when disassembled; by adjusting the shielding height and the spraying angle, the morphology of the coatings around air film cooling holes can be changed, and the edge morphology of the coatings can be matched with the air flow characteristic. By preparing the thermal barrier coatings of the blades with the air film cooling holes of complicated shapes through the method, the optimal cooling effect of the air film cooling holes can be realized without damaging airflow channels.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a method for plugging surface micropores in a thermal spraying process. Background technique [0002] The efficiency of a gas turbine increases as the turbine inlet temperature increases. The current gas temperature is far higher than the temperature limit of the blade material, so the turbine blades must be effectively cooled to ensure the normal operation of the turbine. Air film cooling is one of the cooling methods used on the turbine blades of gas turbines. It injects cooling medium into high-temperature gas by slotting or small holes in high-temperature components. Under the action of mainstream pressure and friction, the jet bends and covers the surface of high-temperature components, forming a cold air film to separate the high-temperature gas from the wall. The processing of film cooling holes usually adopts EDM, laser and other methods. The fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/02C23C4/073C23C4/10C23C4/134
CPCC23C4/02C23C4/10
Inventor 李太江杨二娟李巍李勇刘刚米紫昊
Owner HUANENG POWER INT INC
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