Plasma evaporation deposition lanthanide thermal barrier coating ceramic layer with long service lifer, high insulation performance and composite structure, and preparation method thereof

Abstract

The invention discloses a plasma evaporation deposition lanthanide thermal barrier coating ceramic layer with a long service life, a high insulation performance and a composite structure, and a preparation method thereof, and belongs to the technical field of thermal barrier coating. The ceramic layer material comprises lanthanum zirconate or cerate; the thermal barrier coating comprises a bonding layer, a first ceramic layer and a second ceramic layer which are prepared on a base body, wherein the first ceramic layer adopts a YSZ coating; the second ceramic layer comprises the lanthanum zirconate or cerate; in the preparation method of the ceramic layer, the pressure of a vacuum chamber is lower than 1 mbar; through adjusting parameters of spraying electric power, current, gas flow rate, temperature of the basal body, powder feeding rate, spraying distance and the like, the YSZ coating layer and the lanthanide thermal barrier coating ceramic layer which are provided with microstructures of columnar crystal structures, layered structures, layered structures and columnar crystal structures, or nano- structured coating and the like can be obtained. The service life of the thermal barrier coating is long and the heat-insulating property is favorable.

Description

technical field

[0001] The invention belongs to the technical field of thermal barrier coatings, and relates to a preparation method of a novel composite multi-phase structure thermal barrier coating ceramic layer, more specifically, an ultra-low pressure plasma physical vapor deposition method is used to prepare high heat insulation and long service life Novel Lanthanide Thermal Barrier Coating Approach. Background technique

[0002] Thermal barrier coatings (TBCs) use the superior high temperature resistance, corrosion resistance and low thermal conductivity of ceramic materials to combine ceramics and metal substrates in the form of coatings to increase the working temperature of metal hot-end parts and enhance the thermal performance of hot-end parts. It is a surface protection technology that can resist high temperature oxidation, prolong the service life of hot end parts and improve engine efficiency.

[0003] The most widely used thermal barrier coating ceramic layer...

Examples

Embodiment 1

[0039] Example 1: Depositing a columnar crystal structure La on the surface of a superalloy substrate 2 Ce 2 o 7 / YSZ double ceramic layer thermal barrier coating, the specific steps are as follows:

[0040] The first step, prepare the substrate:

[0041] (1) Prepare the original superalloy sheet with a size of Φ30×4mm, polish the surface of the sample with 200#, 600#, and 800# sandpaper respectively, put it in acetone for ultrasonic cleaning for 10 minutes, sandblast pretreatment, and set aside;

[0042] (2) The NiPtAl bonding layer is prepared by electroplating and embedding infiltration. The main process parameters are: prepare the electroplating solution for Pt, and the formula is Pt(NH 3 ) 2 (NO 2 ) 2 17g / L, NH 4 NO 3 100g / L, NaNO 2 10g / L NH 4 OH50g / L, electroplating current is 0.5-2mA / mm 2 , the electroplating time is 1h, the temperature is 90°C, and then aluminized by embedding infiltration method, and the temperature is kept at 1000°C for 90min. (3) Vacuum ...

Embodiment 2

[0056] The microscopic morphology, coating thickness, heat insulation performance and thermal shock resistance performance of the prepared samples were measured. A thermal barrier coating with double ceramic layers was prepared, the schematic diagram of which is shown in figure 1 shown. The thickness of the YSZ coating was found to be about 100 μm by scanning electron microscopy, La 2 Ce 2 o 7 The thickness is 100μm; both are columnar crystal structure coatings, figure 2 The prepared columnar crystal structure La 2 Ce 2 o 7 Cross-sectional SEM photograph of the coating. This shows that after the spray powder is fed into the plasma spray gun, due to the high enough energy of the plasma flame, the spray powder is evaporated to form gas-phase atoms, and then sprayed onto the surface of the substrate with the plasma flow, and a columnar crystal structure coating is deposited. The thermal shock test was carried out on the sample. Under the thermal cycle conditions of surfa...

Embodiment 3

[0075] Example 3: Depositing columnar grains and interphase Gd with a layered structure on the surface of a superalloy substrate 2 Zr 2 o 7 / YSZ double ceramic layer thermal barrier coating,

[0076] In the first step, the base alloy is prepared, and a bonding layer is prepared on the surface of the base alloy.

[0077] (1) Prepare the original superalloy sheet with a size of Φ30×4mm, polish the surface of the sample with 200#, 600#, and 800# sandpaper respectively, put it in acetone for ultrasonic cleaning for 10 minutes, sandblast pretreatment, and set aside;

[0078] (2) Prepare NiCoCrAlY bonding layer spray powder and YSZ, Gd 2 Zr 2 o 7 ceramic layer powder,

[0079] (3) The NiCoCrAlY bonding layer was prepared by atmospheric plasma spraying equipment. The main process parameters are: current 600A, voltage 70V, powder feeding rate 10g / min, spraying distance 100mm, main gas flow Ar gas 2000L / h, H 2 The gas flow rate is 6.5L / min, the deposition time is 20min, and the ...

technical field

[0001] The invention belongs to the technical field of thermal barrier coatings, and relates to a preparation method of a novel composite multi-phase structure thermal barrier coating ceramic layer, more specifically, an ultra-low pressure plasma physical vapor deposition method is used to prepare high heat insulation and long service life Novel Lanthanide Thermal Barrier Coating Approach. Background technique

[0002] Thermal barrier coatings (TBCs) use the superior high temperature resistance, corrosion resistance and low thermal conductivity of ceramic materials to combine ceramics and metal substrates in the form of coatings to increase the working temperature of metal hot-end parts and enhance the thermal performance of hot-end parts. It is a surface protection technology that can resist high temperature oxidation, prolong the service life of hot end parts and improve engine efficiency.

[0003] The most widely used thermal barrier coating ceramic layer...

Examples

Embodiment 1

[0039] Example 1: Depositing a columnar crystal structure La on the surface of a superalloy substrate 2 Ce 2 o 7 / YSZ double ceramic layer thermal barrier coating, the specific steps are as follows:

[0040] The first step, prepare the substrate:

[0041] (1) Prepare the original superalloy sheet with a size of Φ30×4mm, polish the surface of the sample with 200#, 600#, and 800# sandpaper respectively, put it in acetone for ultrasonic cleaning for 10 minutes, sandblast pretreatment, and set aside;

[0042] (2) The NiPtAl bonding layer is prepared by electroplating and embedding infiltration. The main process parameters are: prepare the electroplating solution for Pt, and the formula is Pt(NH 3 ) 2 (NO 2 ) 2 17g / L, NH 4 NO 3 100g / L, NaNO 2 10g / L NH 4 OH50g / L, electroplating current is 0.5-2mA / mm 2 , the electroplating time is 1h, the temperature is 90°C, and then aluminized by embedding infiltration method, and the temperature is kept at 1000°C for 90min. (3) Vacuum ...

Embodiment 2

[0056] The microscopic morphology, coating thickness, heat insulation performance and thermal shock resistance performance of the prepared samples were measured. A thermal barrier coating with double ceramic layers was prepared, the schematic diagram of which is shown in figure 1 shown. The thickness of the YSZ coating was found to be about 100 μm by scanning electron microscopy, La 2 Ce 2 o 7 The thickness is 100μm; both are columnar crystal structure coatings, figure 2 The prepared columnar crystal structure La 2 Ce 2 o 7 Cross-sectional SEM photograph of the coating. This shows that after the spray powder is fed into the plasma spray gun, due to the high enough energy of the plasma flame, the spray powder is evaporated to form gas-phase atoms, and then sprayed onto the surface of the substrate with the plasma flow, and a columnar crystal structure coating is deposited. The thermal shock test was carried out on the sample. Under the thermal cycle conditions of surfa...

Embodiment 3

[0075] Example 3: Depositing columnar grains and interphase Gd with a layered structure on the surface of a superalloy substrate 2 Zr 2 o 7 / YSZ double ceramic layer thermal barrier coating,

[0076] In the first step, the base alloy is prepared, and a bonding layer is prepared on the surface of the base alloy.

[0077] (1) Prepare the original superalloy sheet with a size of Φ30×4mm, polish the surface of the sample with 200#, 600#, and 800# sandpaper respectively, put it in acetone for ultrasonic cleaning for 10 minutes, sandblast pretreatment, and set aside;

[0078] (2) Prepare NiCoCrAlY bonding layer spray powder and YSZ, Gd 2 Zr 2 o 7 ceramic layer powder,

[0079] (3) The NiCoCrAlY bonding layer was prepared by atmospheric plasma spraying equipment. The main process parameters are: current 600A, voltage 70V, powder feeding rate 10g / min, spraying distance 100mm, main gas flow Ar gas 2000L / h, H 2 The gas flow rate is 6.5L / min, the deposition time is 20min, and the ...

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