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Multiphase environmental barrier coating formed on base material and preparation method thereof

A base material and environmental barrier technology, applied in metal material coating process, coating, sustainable transportation, etc., can solve the problems of low coating deposition rate and high cost, achieve good high temperature protection effect, good thermal expansion coefficient matching, The effect of improving the performance of high temperature water-oxygen corrosion resistance

Active Publication Date: 2020-11-03
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN102249735A discloses a method for preparing an environmental barrier coating at a low temperature, which discloses using polyazide silane as a precursor to mix scandium silicate (Sc 2 Si 2 o 7 ) powder to prepare slurry, using Li 2 CO 3 Preparation of Sc at 1250°C as a sintering aid 2 Si 2 o 7 Environmental barrier coatings, also the thermal shock resistance and high temperature water-oxygen corrosion resistance of the environmental barrier coatings need to be further improved
However, for the environmental barrier coatings of multi-layer complex systems, the above preparation methods have certain limitations, including low coating deposition rate and high cost.

Method used

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  • Multiphase environmental barrier coating formed on base material and preparation method thereof
  • Multiphase environmental barrier coating formed on base material and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0034] In a second aspect, the present invention provides a method for preparing the multiphase environmental barrier coating described in the first aspect of the present invention, said method comprising the steps of:

[0035] (1) Silicon powder (Si powder), mullite powder and lutetium silicate powder (Lu 2 SiO 5 powder) and scandium silicate powder (Sc 2 Si 2 o 7 Powder) mixed powder (Lu 2 SiO 5 -Sc 2 Si 2 o 7 Mixed powder) is loaded into the powder feeder of ultra-low pressure plasma spraying equipment respectively and carries out drying treatment; In the present invention, for example, select Si powder, mullite powder, Lu 2 SiO 5 -Sc 2 Si 2 o 7 Mixed powder (Lu 2 SiO 5 with Sc 2 Si 2 o 7 The molar ratio is, for example, (0.8-1.2): 1), and the three kinds of powders are respectively loaded into the powder feeder of the ultra-low pressure plasma spraying equipment, and the powder in the powder feeder is heated to 50-80°C and then dried 3~5h;

[0036] (2) f...

Embodiment 1

[0061] The first step is to prepare SiC fiber-reinforced SiC ceramic matrix composites (SiC f / SiC ceramic matrix composite material) matrix wafer, the size is Φ25×4mm, the surface is polished on 400#, 800#, 1200# sandpaper respectively, put into acetone for ultrasonic cleaning for 15min, and then set aside.

[0062] In the second step, the particle size of the Si powder after spray granulation is selected to be 5-20 μm, the particle size of the mullite powder is 5-30 μm, and the particle size of the Lu powder is 5-30 μm. 2 SiO 5 -Sc 2 Si 2 o 7 The particle size of the mixed powder is 10-40 μm. The powder particles after granulation are hollow micron-spherical powders; the above three kinds of powders are added to the powder feeder of the ultra-low pressure plasma spraying equipment, and the temperature is raised to 50 °C and then dried for 5 hours; among them, Lu 2 SiO 5 -Sc 2 Si 2 o 7 Lu in mixed powder 2 SiO 5 with Sc 2 Si 2 o 7 The molar ratio is 1:1.

[006...

Embodiment 2

[0073] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0074] In the second step, the selected Lu 2 SiO 5 -Sc 2 Si 2 o 7 Lu in mixed powder 2 SiO 5 with Sc 2 Si 2 o 7 The molar ratio is 0.8:1.

[0075] The same test method as in Example 1 was used to test the thermal shock cycle resistance and high temperature water-oxygen corrosion resistance of the multiphase environmental barrier coating prepared in this example. The performance test results are shown in Table 1.

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Abstract

The invention relates to a multiphase environmental barrier coating formed on a base material and a preparation method thereof. The multiphase environmental barrier coating sequentially comprises a silicon bonding layer, a mullite layer and a Lu2SiO5-Sc2Si2O7 multiphase ceramic layer from the base material to the outside, wherein the Lu2SiO5-Sc2Si2O7 multiphase ceramic layer is formed by mixing lutetium silicate and scandium silicate. The method comprises the following steps: filling silicon powder, mullite powder and mixed powder formed by mixing lutetium silicate powder and scandium silicatepowder into a powder feeder of ultra-low pressure plasma spraying equipment and carrying out drying treatment; fixing the base material to a rotating table in a spraying cabin; and sequentially preparing the silicon bonding layer, the mullite layer and the Lu2SiO5-Sc2Si2O7 multiphase ceramic layer on the surface of the base material to prepare the multiphase environmental barrier coating. The multiphase environmental barrier coating is long in thermal shock resistance life and excellent in high-temperature water-oxygen corrosion resistance; and the method provided by the invention can be usedfor rapidly and integrally preparing the multiphase environmental barrier coating at low cost in an ultra-low pressure environment.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, and in particular relates to a multiphase environmental barrier coating formed on a base material and a preparation method thereof. Background technique [0002] Matrix materials such as ceramic matrix composites have the advantages of high temperature resistance, low density, high specific strength, and high toughness. They are often used to prepare key components such as aeroengine blades, which can significantly reduce fuel consumption and improve engine efficiency. However, due to the higher and higher service temperature of the internal blades of the engine, and the increasingly harsh service environments such as high-temperature water vapor and molten salt, it is difficult to meet the needs of the new generation by relying solely on the ceramic matrix composite material matrix, single-layer thermal barrier coating or single-layer environmental barrier coating. High performance engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/11C23C4/134C23C4/04
CPCC23C4/11C23C4/134C23C4/04Y02T50/60
Inventor 张宝鹏裴雨辰于新民刘伟陈鑫阳
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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