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Thermal barrier coating with composite vertical crack and quasi-columnar gradient structure and preparation method of thermal barrier coating

A gradient structure, thermal barrier coating technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problem of poor thermal shock resistance, poor heat insulation performance, poor internal and interface bonding strength of the coating and other problems to achieve the effect of controllable vertical crack spacing

Pending Publication Date: 2021-12-31
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding strength between the inside and the interface of the current thermal barrier coating and its thermal insulation performance usually cannot reach a good balance value, that is, if the bonding strength between the inside and the interface of the prepared coating is good, its thermal shock resistance is relatively low. Good, but the heat insulation performance is poor; if the heat insulation performance of the coating is good, the bonding strength between the interior and the interface of the coating is poor, and the thermal shock resistance is poor

Method used

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  • Thermal barrier coating with composite vertical crack and quasi-columnar gradient structure and preparation method of thermal barrier coating
  • Thermal barrier coating with composite vertical crack and quasi-columnar gradient structure and preparation method of thermal barrier coating
  • Thermal barrier coating with composite vertical crack and quasi-columnar gradient structure and preparation method of thermal barrier coating

Examples

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preparation example Construction

[0032] Aiming at the technical problems of this application, this application proposes a method for preparing a thermal barrier coating with composite vertical cracks and quasi-columnar gradient structure, which is carried out in a low-pressure chamber of a plasma spraying system under low vacuum conditions. In the present application, the plasma spraying system under low vacuum conditions may include, in addition to the low-pressure chamber, a substrate clamping control unit, a plasma generation unit located directly above the substrate, and a jet stabilization control unit connected to the plasma generation unit and Powder feeding control unit, in which:

[0033] The substrate clamping control unit is used for clamping the substrate, and controlling the substrate to keep perpendicular to the plasma jet, as well as controlling the temperature of the substrate during spraying and pre-sintering. In this application, the substrate is a carrier that needs to deposit a ceramic coa...

example 1

[0054] The substrate is made of austenitic chromium-nickel stainless steel (commonly known as heat-resistant stainless steel 310S). Austenitic chromium-nickel stainless steel has good oxidation resistance and corrosion resistance. With a high percentage of chromium and nickel, it has good creep strength, can work continuously at high temperatures, and has good high temperature resistance.

[0055] The preparation method is as follows:

[0056] 1) Prepare a rectangular or circular substrate material, and fix the substrate and the substrate clamping control unit through a fixed clamping device;

[0057] 2) Sandblasting the surface of the substrate, and then spraying the bonding layer NiCrAlY with a supersonic flame, with a spray thickness of 100-150 μm;

[0058] 3) Turn on the plasma generating unit, adjust the working gas to be a mixture of argon and helium, the working current is 2000A, turn on the jet stability control unit, and spray a plasma jet with a length of 1500mm to ...

example 2

[0064] The substrate is nickel-based superalloy K465. Nickel-based superalloy K465 has high creep resistance, fatigue resistance and high temperature bearing capacity, and is usually used as the stator blade of the propeller.

[0065] The preparation method is as follows:

[0066] 1) Prepare the substrate, and fix the substrate and the substrate clamping control unit through the fixed clamping device;

[0067] 2) Sandblasting the surface of the substrate, and then spraying the bonding layer NiCrAlY with a supersonic flame, with a spray thickness of 100-150 μm;

[0068] 3) Turn on the plasma generating unit, adjust the working gas to be a mixture of argon and helium, the working current is 2000A, turn on the jet stability control unit, and spray a plasma jet with a length of 1500mm to the substrate;

[0069] 4) Prepare 7YSZ powder with a particle size of 1-30 μm, and feed the powder at a rate of 3-4 g / min. In the low-pressure cabin, feed the 7YSZ powder into the plasma jet at...

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Abstract

The invention discloses a thermal barrier coating with a composite vertical crack and a quasi-columnar gradient structure and a preparation method of the thermal barrier coating, and relates to the field of material processing. The preparation method is carried out in a low-pressure cabin in a plasma spraying system under the low vacuum condition, and plasma jet flow with the jet flow length ranging from 1000 mm to 1800 mm and the radial expansion size ranging from 200 mm to 400 mm is obtained by controlling relevant parameters; the plasma jet flow is used for spraying ceramic powder, and ceramic coatings with different distribution densities and a quasi-columnar structure are obtained by controlling different spraying distances, total air flow and the like; along with the adjustment of the vacuum degree in the low-pressure cabin, the working current of plasma, the total air flow and the spraying distance, the ceramic coating of the quasi-columnar structure continues to be pre-sintered, and the thermal barrier coating with the composite vertical crack and the quasi-columnar gradient structure is directly deposited on the surface of a metal hot end component such as a high-temperature alloy; and the vertical crack spacing of the composite coating is controllable, the bonding strength between coatings is improved, and the thermal shock resistance is improved.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a composite vertical crack and quasi-columnar gradient structure thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coating is a protective coating for hot end parts such as gas turbine engines, which is composed of a metal intermediate layer and a ceramic surface layer. The thermal barrier coating system on the surface of the hot end parts of the gas turbine engine can not only delay heat conduction, reduce the surface temperature of the substrate, prolong the service life of the substrate, but also provide good high-temperature oxidation and corrosion protection performance for the superalloy substrate. [0003] Lamellar bonded ceramic thermal barrier coatings with vertical crack distribution have good heat insulation effect, high bonding strength and good stress release characteristics, and at the same time greatly improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/137C23C4/10
CPCC23C4/134C23C4/137C23C4/10
Inventor 郭洪波刘森辉何文婷李珊石佳魏亮亮彭徽
Owner BEIHANG UNIV
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