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

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, ...

Examples

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.

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, ...

Examples

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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