Longitudinal Hole Forming Method and Thermal Barrier Coatings Based on Inverse Deformation of Layered Thermal Barrier Coatings

A technology of thermal barrier coating and reverse deformation, applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of weakening of coating heat insulation, increasing pore-forming stress, and inevitable sintering and densification of coating and other issues to achieve the effect of improving service life, prolonging service life and high strain tolerance

Active Publication Date: 2022-05-24
XI'AN PETROLEUM UNIVERSITY
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods mainly focus on two aspects: (1) Obtain a relatively dense structure, densify the structure, obtain a large pore-forming stress by increasing the apparent elastic modulus, and then form pores longitudinally; however, the relatively dense structure It inevitably sacrifices the thermal insulation ability of the coating in the longitudinal direction; (2) Increase the pretreatment temperature of the coating (mostly 800°C to 1400°C) to obtain a larger shrinkage deformation, thereby increasing the pore-forming stress, but the higher temperature It often inevitably causes the sintering and densification of the coating, and also has a certain weakening effect on the heat insulation of the coating.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Longitudinal Hole Forming Method and Thermal Barrier Coatings Based on Inverse Deformation of Layered Thermal Barrier Coatings
  • Longitudinal Hole Forming Method and Thermal Barrier Coatings Based on Inverse Deformation of Layered Thermal Barrier Coatings
  • Longitudinal Hole Forming Method and Thermal Barrier Coatings Based on Inverse Deformation of Layered Thermal Barrier Coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A low-temperature longitudinal pore forming method based on a reverse deformation high thermal insulation layered thermal barrier coating, comprising the following steps:

[0050] In step 1, a disk-shaped nickel-based superalloy is selected as the metal substrate 1. The diameter of the disk-shaped nickel-based superalloy is 25.4 mm, the thickness is 3 mm, and the model is Inconel738. A metal bonding layer 2 with a thickness of 80 μm is prepared on the upper surface of the metal substrate 1 by a plasma spraying process. The material of the metal bonding layer 2 is spherical NiCoCrAlTaY powder with a particle size of 10 μm˜50 μm. The spraying power is 35kW, the main gas argon is 40L / min, the auxiliary gas hydrogen is 7L / min, the spraying distance is 120mm, and the gun speed is 600mm / s.

[0051] In step 2, a 500 μm ceramic thermal insulation layer 3 is prepared on the metal bonding layer 2 by a plasma spraying process. The powder of the ceramic coating is yttria-stabiliz...

Embodiment 2

[0057] The difference between this example and Example 1 is that in step 3.2, the water flow pressure used is 21MPa, the obtained longitudinal pore depth is 30% to 60% of the coating thickness, and the pore spacing is 0.6 times to 40% of the coating thickness. times.

Embodiment 3

[0059] The difference between this embodiment and Embodiment 1 is that in step 1, a metal bonding layer 2 with a thickness of 50 μm is deposited on the metal substrate 1, and in step 2, a ceramic bonding layer 2 with a thickness of 200 μm is deposited on the metal bonding layer 2. Insulation layer 3. In step 3, the thermal barrier coating and the metal substrate 1 are simultaneously heated to 200° C. within 3 minutes, and then the metal substrate 1 is continuously heated to 600° C. At the same time, the flow velocity is 50 m / s and the pressure is 5 MPa. For the ceramic heat insulating layer 3, the temperature difference between the ceramic heat insulating layer 3 and the metal base 1 is 550°C after the temperature is raised.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a longitudinal hole-forming method of a layered thermal barrier coating based on reverse deformation and a thermal barrier coating. The layered thermal barrier coating with low thermal conductivity is prepared by using a conventional plasma spraying process, and then adopts The method of reverse deformation forms transverse tensile stress in the coating, and forms large-scale longitudinal pores along the heat flow direction in the layered thermal barrier coating. The pore depth is 20% to 100% of the coating thickness, and the pore interval is 0.5 to 10 times the thickness. In high-temperature service environment, the layered structure with low thermal conductivity can effectively block heat flow and play a role of high heat insulation; while the large-scale longitudinal pores can significantly reduce the overall rigidity of the coating in high-temperature service, thereby passing through the low-induced The cracked design has the effect of greatly extending the service life of the coating. The invention achieves the purpose of forming large-scale longitudinal pores in the high heat insulation layered thermal barrier coating at low temperature, and is expected to achieve the synergistic optimization effect of high heat insulation and long life.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a preparation method of a thermal barrier coating and a thermal barrier coating. Background technique [0002] Thermal barrier coatings are widely used in aero-engines and ground-based gas turbines. The main function is to reduce the bearing temperature of metal-based hot end components and prevent them from failing in an environment higher than their own temperature-bearing limit. For example, at present, the turbine inlet temperature of H-class heavy-duty gas turbines has reached 1600°C, and the temperature-bearing capacity of the hot-end components is required to reach more than 1400°C. However, the temperature limit of current state-of-the-art single crystal superalloys is only about 1100°C. Therefore, corresponding cooling protection measures must be taken to ensure the stable operation of the hot end components. Thermal barrier coating is one of the necessary thermal ins...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/02C23C4/06C23C4/10
CPCC23C4/134C23C4/02C23C4/06C23C4/10
Inventor 王丽爽董会姚建洮李霄张骁勇周勇
Owner XI'AN PETROLEUM UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products