EB-PVD/APS composite structure double-ceramic-layer thermal barrier coating and preparation method thereof

An EB-PVD, composite structure technology, applied in coating, metal material coating process, ion implantation plating and other directions, can solve the problem of unfavorable thick thermal barrier coating, EB-PVD coating preparation process is many, EB-PVD The problem of low coating deposition rate, etc., can prolong the overall protection effect, improve the interface matching, and enhance the anti-peeling ability.

Pending Publication Date: 2020-11-20
BEIJING GOLDEN WHEEL SPECIAL MACHINE
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EB-PVD equipment is more complex and costly than APS equipment, and EB-PVD coating has many preparation processes, resulting in much lower production efficiency and cost of EB-PVD coating than APS coating. And the EB-PVD coating deposition rate is relatively low, which is not conducive to the preparation of thick thermal barrier coatings with a thickness greater than 200 μm
[0004] Thermal insulation is one of the main functions of thermal barrier coatings. As the thickness of the coating increases, the thermal insulation performance of thermal barrier coatings increases. Compared with EB-PVD coatings, APS thermal barrier coatings have lower thermal conductivity. Higher thermal insulation performance can be obtained when the thickness of the barrier coating is consistent, but the APS thermal barrier coating can no longer meet the requirements of high-temperature components of high-performance gas turbine engines, and EB-PVD thermal barrier coatings with a thickness greater than 200 μm are required to protect turbine components
However, the low production efficiency and high cost determined by the characteristics of the EB-PVD thermal barrier coating process limit its application in thick thermal barrier coatings.

Method used

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  • EB-PVD/APS composite structure double-ceramic-layer thermal barrier coating and preparation method thereof
  • EB-PVD/APS composite structure double-ceramic-layer thermal barrier coating and preparation method thereof
  • EB-PVD/APS composite structure double-ceramic-layer thermal barrier coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: A kind of EB-PVD / APS composite structure double ceramic layer thermal barrier coating (recorded as EB-PVD / APS~1), its specific implementation steps are as follows:

[0033] Step 1: Pretreatment of the substrate surface:

[0034] The substrate of the superalloy sample was wet blasted, and then ultrasonically cleaned with an anhydrous ethanol cleaning agent. The wet sandblasting process is as follows: the sandblasting medium is 100 mesh white corundum, the sandblasting pressure is 0.15MPa, and the sandblasting distance is 70mm.

[0035] Step 2: Preparation of MCrAlY metal bonding layer by electron beam physical vapor deposition

[0036] The treated superalloy sample is clamped in a special tooling, and the MCrAlY metal bonding layer is deposited in the vacuum chamber of the EB-PVD equipment. The vacuum chamber pressure during the deposition process is less than 1.0×10 ～2 Pa, the electron gun voltage is 18~20kV, the MCrAlY target heating current is 1~1.5A, ...

Embodiment 2

[0049] Embodiment 2: A kind of EB-PVD / APS composite structure double ceramic layer thermal barrier coating (recorded as EB-PVD / APS~2), its specific implementation steps are as follows:

[0050] Step 1: Pretreatment of the substrate surface:

[0051] The superalloy sample substrate is subjected to wet sandblasting, and then ultrasonically cleaned with absolute ethanol or cleaning agent. The wet sandblasting process is as follows: the sandblasting medium is 200 mesh white corundum, the sandblasting pressure is 0.4MPa, and the sandblasting distance is 100mm.

[0052] Step 2: Preparation of MCrAlY metal bonding layer by electron beam physical vapor deposition

[0053] The treated superalloy sample is clamped in a special tooling, and the MCrAlY metal bonding layer is deposited in the vacuum chamber of the EB-PVD equipment. The vacuum chamber pressure during the deposition process is less than 1.0×10 ～2 Pa, the electron gun voltage is 18-20kV, the MCrAlY target heating current is...

Embodiment 3

[0067] The difference between this example and Example 1 is that the MCrAlY metal bonding layer is prepared by vacuum arc ion plating in step 2. When vacuum arc ion plating is used to prepare the metal bonding layer, the vacuum chamber pressure is less than 0.3Pa, and the arc current is 80A. The workpiece bias voltage is -25V, and the workpiece heating temperature is 350°C. The obtained composite structure double ceramic layer thermal barrier coating is denoted as EB-PVD / APS~3.

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Abstract

The invention discloses an EB-PVD / APS composite structure double-ceramic-layer thermal barrier coating. The thermal barrier coating comprises a MCrAlY metal bonding layer, a columnar crystal structureceramic layer, a layer-like-structured columnar crystal transition layer and a layered structure ceramic layer, wherein the layer-like-structured columnar crystal transition layer is obtained by performing surface treatment on the columnar crystal structure ceramic layer, and a thickness of the layer-like-structured columnar crystal transition layer is 20-50 micrometers. A preparation method of the thermal barrier coating combines the thermal barrier coating characteristics of a columnar crystal structure prepared by electron beam physical vapor deposition and an atmospheric plasma spraying layered structure, the layer-like-structured columnar crystal transition layer improves bonding capacity between the layered structure and the columnar crystal structure ceramic layer, bending resistance and thermal shock resistance of the thermal barrier coating are remarkably improved, the long service life and the high thermal insulation performance of the composite structure double-ceramic-layer thermal barrier coating are achieved, and the long service life and high thermal insulation coordination design of the novel structural thermal barrier coating are realized at a low cost.

Description

technical field [0001] The invention relates to the field of thermal barrier coatings, in particular to an EB-PVD / APS composite structure double ceramic layer thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coatings (TBCs) are composed of an oxidation-resistant and corrosion-resistant bonding layer and a high-temperature-resistant, corrosion-resistant and low-thermal-conduction ceramic layer, which can improve the high-temperature oxidation resistance and corrosion resistance of the hot-end parts and prolong the life of the hot-end parts. Service life, thermal barrier coating is an effective surface protection technology to improve the efficiency of gas turbines, and has been widely used in the protection of hot end parts of gas turbine engines. With the development of gas turbine engine technology, the temperature at the front inlet of the turbine continues to increase. Even with the advanced cooling structure design, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/30C23C14/16C23C14/08C23C4/134C23C4/11C23C4/02C23C14/58
CPCC23C14/30C23C14/16C23C14/5806C23C14/083C23C4/11C23C4/134C23C4/02
Inventor 何箐王世兴梁立康李建超李建华
Owner BEIJING GOLDEN WHEEL SPECIAL MACHINE
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