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Thermal barrier coating material with closed surface layer and preparation method thereof

A technology of thermal barrier coating and surface layer, applied in coating, metal material coating process, melt spraying and other directions, which can solve problems such as loose and porous

Inactive Publication Date: 2014-08-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite technology of "atmospheric plasma spraying (APS) + high current pulsed electron beam (HCPEB)" is used to prepare thermal barrier coating materials with closed surface layer. Through structural design and preparation method design, the surface of ceramic coatings prepared by ion spraying method is solved. Structural defects such as porosity and porosity form vertical cracks and columnar crystal remelting layers, which improve the strain tolerance and thermal shock performance of the coating, thus effectively prolonging the service life of the thermal barrier coating

Method used

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  • Thermal barrier coating material with closed surface layer and preparation method thereof
  • Thermal barrier coating material with closed surface layer and preparation method thereof
  • Thermal barrier coating material with closed surface layer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] S1. Carry out pre-grinding, cleaning, and sandblasting roughening treatment on the superalloy substrate; according to the technical requirements of the sandblasting equipment, the sandblasting material is 60 mesh white corundum, the pressure is 0.4MPa, and the sandblasting distance is 120mm.

[0031] S2. Deposit a metal bonding layer Co23Cr13Al0.5Y on the surface of the roughened superalloy substrate by atmospheric plasma spraying to complete the preparation of the metal bonding layer. The thickness of the bonding layer is 160 μm; according to the requirements of atmospheric plasma spraying equipment, select The voltage is 38V, the current is 750A, the speed of the spray gun is 450mm / s, and the spraying distance is 85mm.

[0032] S3, using the method of atmospheric plasma spraying to deposit 8% Y on the surface of the metal bonding layer 2 o 3 Stable ZrO 2 For the ceramic surface layer, the preparation of the thermal barrier coating is completed, and the thickness of ...

Embodiment 2

[0038] Same as Example 1, only change the electron beam parameters in S4, select the electron beam energy as 27KeV according to the technical requirements of HCPEB equipment, and the energy density is 4J / cm 2 , the target-source distance is 15cm, and the sample is irradiated 5 times.

[0039] The surface and cross-section of the thermal barrier coating were observed by SEM; the results showed that after 5 irradiation treatments, the surface layer evaporated, and the grain grew, forming a larger grain structure with a size between 0.6 and 1.3 μm; A large number of gas-deposited particles can be observed in the fine-grained surface layer; in addition, only individual melting pits were observed after 5 bombardments; the number and width of network vertical cracks increased compared with 1 bombardment; the thickness of the remelted layer was between 2.5-4 μm between.

[0040] The surface roughness of the thermal barrier coating was analyzed by three-dimensional laser scanning mic...

Embodiment 3

[0043] Same as Example 1, only change the electron beam parameters in S4, select the electron beam energy as 27KeV according to the technical requirements of HCPEB equipment, and the energy density is 4J / cm 2 , the target-source distance is 15cm, and the sample is irradiated 10 times.

[0044] The surface and cross-section of the thermal barrier coating were observed by SEM; the results showed that after 10 times of irradiation treatment, the surface layer evaporated obviously, and the grain size was reduced compared with 5 times of bombardment, between 0.5 and 1.5 μm. A large number of gas deposition particles can be observed in the surface layer; in addition, the melting pit completely disappeared after 10 bombardments; the number and width of vertical cracks in the network increased compared with 5 times; the remelted layer is mainly composed of columnar grains, and the combination of columnar grains Tight; the thickness of the remelted layer is about 7~8μm.

[0045] The s...

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Abstract

Belonging to the technical field of thermal barrier coating surface treatment and modification, the invention in particular relates to a thermal barrier coating material with a closed surface layer and a preparation method thereof. The coating material comprises a metal bonding layer, a rough and porous ceramic surface layer and a cylindrical crystal remelted layer with a closed surface layer. The invention also discloses a preparation method of the thermal barrier coating material with a closed surface layer, and the method includes: depositing the metal bonding layer on the surface of a high temperature alloy substrate by plasma spraying, then depositing the ceramic layer on the surface of the bonding layer, and finally conducting irradiation treatment on the ceramic layer by a high current pulsed electron beam technology, thus forming the closed cylindrical crystal remelted layer. The thermal barrier coating material with a closed surface layer prepared by the composite technology can effectively block invasion of external harmful gas and improve the strain tolerance and thermal shock performance of the coating, and has good high temperature service performance, thus being an ideal thermal barrier coating.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coating surface treatment and modification, and in particular relates to a thermal barrier coating material with a closed surface layer and a preparation method thereof. Background technique [0002] In the field of aerospace technology today, with the development of aviation gas turbines in the direction of high flow ratio, high thrust-to-weight ratio, and high turbine inlet temperature, the gas temperature and gas pressure in the combustion chamber continue to increase. Compared with the development of new high-temperature heat-resistant alloy materials Generally speaking, applying thermal barrier coatings to high-temperature hot-end components is the most effective method. [0003] In practical applications, typical aerospace thermal barrier coatings (TBCs) mostly adopt a double-layer structure: a ceramic surface layer (TC) for thermal insulation and a metal bonding layer (BC) to improv...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/18C23C4/08C23C4/10C23C4/073C23C4/11C23C4/134
Inventor 关庆丰蔡杰吕鹏侯秀丽杨盛志杨珅
Owner JIANGSU UNIV
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