Longitudinal hole forming method for layered thermal barrier coating based on reverse deformation, and thermal barrier coating

A thermal barrier coating and reverse deformation technology, applied in coatings, metal material coating processes, melt spraying, etc., can solve the problem of weakening thermal insulation of coatings, increasing pore-forming stress, and unavoidable coating sintering and densification. and other problems, to achieve the effect of improving service life, prolonging service life, and quickly realizing engineering applications.

Active Publication Date: 2020-12-01
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 d

Method used

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  • Longitudinal hole forming method for layered thermal barrier coating based on reverse deformation, and thermal barrier coating
  • Longitudinal hole forming method for layered thermal barrier coating based on reverse deformation, and thermal barrier coating
  • Longitudinal hole forming method for layered thermal barrier coating based on reverse deformation, and thermal barrier coating

Examples

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Effect test

Embodiment 1

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

[0050] In step 1, a disc-shaped nickel-based superalloy is selected as the metal substrate 1. The disc-shaped nickel-based superalloy has a diameter of 25.4 mm and a thickness of 3 mm, and its 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 speed of the gun is 600mm / s.

[0051] Step 2, preparing a 500 μm ceramic heat insulating layer 3 on the metal bonding layer 2 by using 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 21 MPa, the resulting longitudinal pore depth is 30% to 60% of the coating thickness, and the pore interval is 0.6 to 4 times 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 with a thickness of 200 μm is deposited on the metal bonding layer 2. Insulation layer3. In step 3, heat the thermal barrier coating and the metal substrate 1 simultaneously to 200°C within 3 minutes, and then continue to heat the metal substrate 1 to 600°C, and at the same time impact with a water flow with a velocity of 50m / s and a pressure of 5MPa. The ceramic heat insulation layer 3 is used to make the temperature difference between the ceramic heat insulation layer 3 and the metal base 1 be 550° C. after heating.

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Abstract

The invention discloses a longitudinal hole forming method for a layered thermal barrier coating based on reverse deformation, and the thermal barrier coating. The layered thermal barrier coating withlow thermal conductivity is prepared by adopting a conventional plasma spraying process; and then transverse tensile stress is formed in the coating through a reverse deformation method, large-scalelongitudinal pores are formed in the layered thermal barrier coating in the heat flow direction, the pore depth is 20%-100% of the thickness of the coating, and the pore interval is 0.5-10 times the thickness of the coating. In a high-temperature service environment, the layered structure with the low thermal conductivity can effectively block a heat flow, so that a high heat insulation effect isachieved; the overall rigidity degree of the coating in high-temperature service can be remarkably decreased through large-scale longitudinal pores, and therefore the effect of greatly prolonging theservice life of the coating is achieved through the low-cracking design; and the purpose of forming the large-scale longitudinal pores in the high-thermal-insulation layered thermal barrier coating ata low temperature is achieved, and the collaborative optimization effect of high thermal insulation and long service life is expected to be achieved.

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 the thermal barrier coating. Background technique [0002] Thermal barrier coatings are widely used in aero-engines and ground gas turbines. The main function is to reduce the load-bearing temperature of metal-based hot-end components and prevent them from failing in environments higher than their own temperature-bearing limits. For example, at present, the turbine inlet temperature of the H-class heavy-duty gas turbine has reached 1600 °C, and the temperature bearing capacity of the hot end parts 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

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Application Information

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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
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