A nicralsi/ceo 2 Doped YSZ thermal barrier coating and preparation method thereof

A technology of thermal barrier coating and deposition layer, which is applied in the direction of coating, metal material coating process, vacuum evaporation plating, etc., can solve the expansion and peeling of bonding layer and ceramic layer, increase the growth rate of TGO layer, ceramic layer Problems such as the gap with the bonding layer, to prevent the peeling of the coating, to achieve the interdiffusion of elements, and to achieve the effect of a firm coating

Active Publication Date: 2020-08-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

For example, in the article "Thermal Shock Resistance of Plasma Sprayed Gradient Thermal Barrier Coatings" in "Metal Heat Treatment" Volume 40, Issue 7, published in July 2015, a gradient thermal barrier coating with a smooth transition along the thickness direction was prepared by plasma spraying. This coating greatly improves the bonding strength of the coating, but the obvious disadvantage is that the alloy members in the gradient coating will undergo severe oxidation at high temperature, resulting in the overall expansion and peeling of the bonding layer and the ceramic layer.
However, there are always capillaries and microcracks between the ceramic layer and the bonding layer. These capillaries and microcracks will increase the oxygen permeability of the ceramic layer at high temperature, thereby increasing the growth rate of the TGO layer, and eventually lead to ceramic Gap between layer and bondline until peel failure
The ceramic layer generally uses Y 2 o 3 Stable ZrO 2 (YSZ), YSZ has an ideal low thermal conductivity, but at a temperature of 1200 ° C, YSZ will undergo a phase transition from t′-tetragonal to tetragonal to cubic. This phase transition Causes cracks to form in the top coat

Method used

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  • A nicralsi/ceo <sub>2</sub> Doped YSZ thermal barrier coating and preparation method thereof
  • A nicralsi/ceo <sub>2</sub> Doped YSZ thermal barrier coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, the mass percentage of each element in NiCrAlSi is: Cr 50wt%, Ni 20wt%, Al 5wt%, Si 25wt%. YSZ is Y 2 o 3 Stable ZrO 2 , where Y2 o 3 The mass percentage is 6%.

[0030] NiCrAlSi / CeO 2 Preparation method of doped YSZ thermal barrier coating:

[0031] (1) Before installing the NiCrAlSi target, polish it with 320-grit sandpaper to remove the oxide layer, ultrasonically clean it in absolute ethanol, and then dry it;

[0032] (2) The material of the matrix 4 is cast 7-TiAl-based intermetallic compound alloy. Using the wire electric discharge cutting technology, the matrix 4 is made into a sample with a size of 15mm×15mm×4mm, and then polished with 320-grit sandpaper. Polished with 2.5μm diamond abrasive paste, ultrasonically cleaned with acetone solution, and dried for later use;

[0033] (3) A plasma etching system is adopted, hydrogen and argon etching gases are selected, and the etching process parameters are as follows: power 2000W, hydrogen f...

Embodiment 2

[0047] In this embodiment, the mass percent of each element in NiCrAlSi is: Cr 70wt%, Ni 10wt%, Al 15wt%, Si 5wt%. YSZ is Y 2 o 3 Stable ZrO 2 , where Y 2 o 3 The mass percentage is 8%.

[0048] NiCrAlSi / CeO 2 Preparation method of doped YSZ thermal barrier coating:

[0049] (1) Before installing the NiCrAlSi target, polish it with 320-grit sandpaper to remove the oxide layer, ultrasonically clean it in absolute ethanol, and then dry it;

[0050] (2) The material of the matrix 4 is a cast γ-TiAl-based intermetallic compound alloy. The matrix 4 is made into a sample with a size of 15mm×15mm×4mm by using the wire electric discharge cutting technology, and then polished with 400-grit sandpaper. Polished with 2.5μm diamond abrasive paste, ultrasonically cleaned with acetone solution, and dried for later use;

[0051] (3) A plasma etching system is adopted, hydrogen and argon etching gases are selected, and the etching process parameters are as follows: power 2500W, hydroge...

Embodiment 3

[0064] In this embodiment, the mass percent of each element in NiCrAlSi is: Cr 60wt%, Ni 15wt%, Al 10wt%, Si 15wt%. YSZ is Y 2 o 3 Stable ZrO 2 , where Y 2 o 3 The mass percentage is 7%.

[0065] NiCrAlSi / CeO 2 Preparation method of doped YSZ thermal barrier coating:

[0066] (1) Before installing the NiCrAlSi target, polish it with 320-grit sandpaper to remove the oxide layer, ultrasonically clean it in absolute ethanol, and then dry it;

[0067] (2) The material of the matrix 4 is a cast γ-TiAl-based intermetallic compound alloy. The matrix 4 is made into a sample with a size of 15mm×15mm×4mm by using the wire electric discharge cutting technology, and then polished with 600-grit sandpaper. Polished with 2.5μm diamond abrasive paste, ultrasonically cleaned with acetone solution, and dried for later use;

[0068] (3) A plasma etching system is adopted, hydrogen and argon etching gases are selected, and the etching process parameters are as follows: power 2250W, hydrog...

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Abstract

The invention discloses a NiCrAlSi / CeO2-doped YSZ thermal barrier coating and a preparation method thereof. The NiCrAlSi / CeO2-doped YSZ thermal barrier coating includes, from top to bottom, a CeO2-doped YSZ deposition layer, a NiCrAlSi binding layer, and a nickel-based high-temperature alloy layer. The preparation method includes: (a) pretreating the surface of a nickel-based high-temperature alloy substrate; (b) forming a microstructure, in a peak-shaped array, on the surface of the substrate through plasma etching; (c) depositing the NiCrAlSi on the substrate through double glow plasma surface metallurgy; (d) depositing CeO2-doped YSZ on the NiCrAlSi deposition layer through a multi-arc plasma plating method, and after the preparation is finished, cooling the product in the furnace to room temperature, and turning off the furnace; (e) tightly binding the CeO2-doped YSZ ceramic layer with the NiCrAlSi binding layer through a vacuum hot pressing diffusion process; (f) heating the moldin a hot pressing diffusion furnace, vacuumizing the chamber, when vacuum degree reaches 10<-4>-10<-2> Pa, heating the mold to 600-700 DEG C and relieving pressure, cooling the product in the furnaceand demolding the product. The thermal barrier coating has high binding strength.

Description

technical field [0001] The invention relates to a thermal barrier coating and a preparation method thereof, specifically a NiCrAlSi / CeO 2 Doped YSZ thermal barrier coating and its preparation method. Background technique [0002] In the aero-engine, the turbine blade is listed as the first key part of the aero-engine because it is the part with the highest temperature, the most complex stress and the harshest environment. Existing superalloys cannot meet the increasing performance demands of turbine blades. In order to prevent the failure of key components under long-term high temperature, it is the most effective method to prepare a layer of thermal barrier coating on its surface. Thermal barrier coatings can greatly reduce the temperature borne by the surface of the metal substrate, and even allow the metal substrate to work at a temperature higher than its own melting point. However, the problem of premature failure of thermal barrier coatings (TBCs) in high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/02C23C14/06C23C14/08C23C14/46
CPCC23C14/0036C23C14/022C23C14/0682C23C14/083C23C14/46
Inventor 魏东博张平则赵瑞博李淑琴姚正军李逢昆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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