Method for preparing ceramic-based composite material environment barrier coating by laser cladding

A composite material, laser cladding technology, applied in the field of coating, to achieve the effect of low residual stress, high efficiency and small thermal distortion

Inactive Publication Date: 2012-01-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, multiple operations must be performed when preparing gradient coatings

Method used

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  • Method for preparing ceramic-based composite material environment barrier coating by laser cladding
  • Method for preparing ceramic-based composite material environment barrier coating by laser cladding
  • Method for preparing ceramic-based composite material environment barrier coating by laser cladding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: C / SiC surface laser cladding BSAS coating

[0025] 1. Substrate preparation: In this experiment, C / SiC was selected as the substrate, and C / SiC was made into a material with a size of 40×5×3.5mm as the substrate material for laser cladding of the coating.

[0026] 2. Powder preparation: BaCO 3 ,,SrCO 3 , Al(OH) 3 and SiO 2 Mix at a molar ratio of 1:1:4:4, add distilled water and wet-mix on a ball mill for 4 hours, place the mixed raw materials in a freeze dryer for freeze-drying, and then place them in a high-temperature furnace for heat treatment at 1100°C, and then heat-treat The final powder was put into a ball mill jar, mixed with distilled water for 4 hours, and dried to obtain the desired Ba 0.5 Sr 0.5 Al 2 Si 2 o 8 Powder.

[0027] 3. Slurry preparation: In this example, polyvinyl acetal (PVB) was selected as the dispersant and binder, and absolute ethanol was used as the solvent. Will make Ba 0.5 Sr 0.5 Al 2 Si 2 o 8 Powder, polyvinyl a...

Embodiment 2

[0030] Example 2: C / SiC surface laser cladding Si / BSAS composite coating

[0031] Step 1-2 is with embodiment 1;

[0032] 3 Slurry preparation: In this example, polyvinyl acetal (PVB) was used as a binder, and absolute ethanol was used as a solvent.

[0033] Si and BSAS were made into slurry respectively, and the preparation method was the same as in Example 1. Now, the Si slurry was evenly coated on the surface of the composite material as an intermediate layer, and dried in an oven at 70°C, and then the BSAS slurry was evenly coated Brush the surface of the material coated with Si slurry as the outermost layer, and place it in an oven to dry at 70°C.

[0034] 4 Laser cladding: This example uses 8kW CO 2 Continuous laser for laser cladding. Place the pre-coated / SiC on the workbench under the laser beam to prepare the Si / BSAS environmental barrier coating. The selected laser cladding process parameters are: laser power 100W; scanning speed 150mm / min; spraying distance 5-1...

Embodiment 3

[0036] Example 3: Laser cladding Sc on C / SiC surface 2 Si 2 o 7涂 layer:

[0037] Step 1 is the same as in Example 1.

[0038] 2 Powder preparation: the selected Sc(NO 3 ) 3 ·6H 2 O, the amount of ethyl silicate (TEOS), ethanol and water is in a molar ratio of 1:1:4:4, a certain amount of ethyl silicate (TEOS) is dissolved in a corresponding amount of ethanol, and fully stirred for a certain period of time. Add Sc(NO 3 ) 3 ·6H 2O was completely dissolved, then distilled water was added and stirred for 12h. The prepared sol was heated and dried in a dryer. Then put it in a high-temperature furnace for heat treatment at 1050 ° C, then put the heat-treated powder into a ball mill jar, add distilled water to wet mix for 4 hours, and dry to obtain the desired Sc 2 Si 2 o 7 Powder.

[0039] 3 Slurry preparation: In this example, polyvinyl acetal (PVB) was selected as the dispersant and binder, and absolute ethanol was used as the solvent. Sc will be produced 2 Si 2 o...

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Abstract

The invention relates to a method for preparing a ceramic-based composite material environment barrier coating by laser cladding, which has the technical characteristics that: 1, a composite material to be coated is processed to a required size and completely washed in an ultrasonic washing machine; 2, the environment barrier coating material powder, a bonding agent and a solvent are mixed uniformly according to a certain ratio to form pulp; 3, the pulp is uniformly brushed on the surface of the composite material and dried; and 4, the membrane coated with the coating pulp is placed on a laser processing worktable, laser cladding is performed by a certain process, and thus, the environment barrier coating is prepared. The interface of the obtained coating is firmly bonded, the coating is uniform and compact, and the quality of the coating is improved obviously. In the invention, the process is simple, area-selectable cladding can be performed, the processing period is short, and high-performance environment barrier coating can be prepared.

Description

technical field [0001] The invention relates to a method for preparing an environmental barrier coating of a ceramic matrix composite material by laser cladding, and belongs to the field of coatings. Background technique [0002] Carbon fiber toughened silicon carbide ceramic matrix composites have been widely used as high-temperature thermal structural parts in the fields of aviation and aerospace engines. An important factor restricting its application is its lack of durability in the engine working environment. In the service environment of aeroengines, silicon-based non-oxide ceramics will react with corrosive media such as water vapor and molten salts to generate gaseous volatile products Si(OH) x (X=1-4), also can be with molten Na simultaneously 2 SO 4 The reaction produces low melting point Na 2 O·xSiO 2 , resulting in the decay of the properties of the composite material. The way to solve the above problems is to coat the surface of the ceramic matrix composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 王一光蒋凤瑞成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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