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Functional gradient thermal barrier coating and preparation method thereof

A technology of thermal barrier coatings and functional gradients, which is applied in coatings, metal material coating processes, etc., can solve the problems of short thermal cycle life and achieve high crystallinity, good bonding strength, and controllable thickness

Pending Publication Date: 2019-09-06
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a functionally graded thermal barrier coating and its preparation method for the short thermal cycle life of a single hexaaluminate thermal barrier coating and the shortcomings of the existing atmospheric plasma spraying hexaaluminate coating process. The thermal barrier coating still has a long thermal cycle life at a temperature higher than 1200 ° C, while taking into account high-temperature phase stability, anti-sintering and high-efficiency thermal barrier properties

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  • Functional gradient thermal barrier coating and preparation method thereof
  • Functional gradient thermal barrier coating and preparation method thereof
  • Functional gradient thermal barrier coating and preparation method thereof

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preparation example Construction

[0036] A method for preparing a functionally graded thermal barrier coating provided by the present invention comprises the following steps:

[0037] Step (1), purifying and roughening the surface of the nickel-based superalloy substrate;

[0038] Purification treatment is to remove oxides, oil stains and other pollutants on the surface of the substrate.

[0039] Further, the surface purification treatment can use 320-800 mesh sandpaper to remove surface oxides, and then use acetone and absolute ethanol solution to ultrasonically clean the oil stains and other pollutants on the surface of the substrate.

[0040] Further, the surface roughening treatment may use corundum sand pressurized wet sandblasting to roughen the surface of the substrate, and then sequentially use acetone and absolute ethanol solution to ultrasonically clean the residual corundum sand on the substrate surface, and dry the substrate for use.

[0041] Further, the corundum sand can be 80-360 mesh, the sand...

Embodiment 1

[0051] The 3D model of the thermal barrier coating is established in the computer, and the model is layered according to the composition gradient of the pre-prepared coating, and the scanning path is planned for each layer and converted into a numerical control program for mechanical operation.

[0052] Before preparing the coating: cut the DZ411 nickel-based superalloy wire into a substrate 1 with a size of 40mm×40mm×10mm, and round the corners of the sample. The surface of the coating to be processed on the substrate 1 was polished with 320-mesh and 800-mesh sandpaper in sequence, and then placed in acetone and absolute ethanol solutions for ultrasonic cleaning for 30 minutes to remove surface oil stains and other pollutants; use 120-mesh corundum sand at 0.3 After performing wet sandblasting on the above surface under MPa pressure, place it in acetone and absolute ethanol solution for 30 minutes for ultrasonic cleaning to remove residual corundum sand on the surface. After r...

Embodiment 2

[0058] The bonding strength of functionally graded thermal barrier coatings prepared by laser near-net-shaping technology was further tested. According to the requirements of the ASTM633-01 standard, prepare the samples required for the tensile bond strength test: the sample diameter is 23-25 ​​mm, the length is 38.1 mm, the coating thickness is > 380 μm, the number of samples is 5, and the tensile load 0.013~0.021mm·s -1 The loading rate is loaded until fracture occurs. When the tensile stress is 350 MPa, the fracture occurs in the coating. Therefore, the bonding strength of the functionally graded thermal barrier coating prepared by the laser near-net forming technology disclosed in the present invention is >350 MPa, which is much higher than that of the thermal barrier coating prepared by the traditional thermal spraying technology. The bonding strength of the barrier coating has reached the standard of metallurgical bonding.

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Abstract

The invention discloses a functional gradient thermal barrier coating and a preparation method thereof, specifically, a bonding layer and a ceramic layer with components and structures continuously changed are prepared on a part matrix alloy by utilizing a laser near-net forming technology. The thermal barrier coating prepared by the method is not affected by the constraint of a mold, a fixture and a tool in the traditional thermal spraying processing process as well as the size and the geometrical shape complexity degree of parts; and meanwhile, the prepared thermal barrier coating has a columnar grain orientation structure, the coating crystallinity is high, the thickness is controllable, and the bonding strength between the coating and a substrate exceeds 350 MPa. The heat cycle life ofthe functional gradient thermal barrier coating is far higher than that of a traditional pure YSZ and double-ceramic-layer thermal barrier coating, and by using the thermal barrier coating, the inletgas temperature of a gas turbine and the service life of a heat channel part can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coatings, in particular to a functionally graded thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coating technology is to cover the surface of the substrate with a material with low thermal conductivity and high stability in a high temperature environment, which not only has a thermal barrier effect, but also can prevent oxidation, corrosion, foreign matter erosion, etc. At present, this technology is widely used in the hot passage parts of ground heavy-duty (power generation) gas turbines, such as the transition section of the combustion chamber, the flame tube, etc., and the surface of the turbine blades. [0003] At present, the most mature thermal barrier coating ceramic layer material is 6-8wt.% Y 2 o 3 Partially stabilized ZrO 2 (referred to as 6~8YSZ), YSZ material has high fracture toughness, low thermal conductivity (2.12W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10C23C24/103C23C24/106
Inventor 南晴肖俊峰唐文书高斯峰李永君张炯
Owner XIAN THERMAL POWER RES INST CO LTD
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