A kind of composite structure environmental barrier coating and its preparation method and application, aero-engine
An aero-engine and composite structure technology, applied in the field of materials, can solve problems such as affecting mechanical properties, large thermal residual stress of coatings, micro-melting or unmelting of powders, etc., so as to avoid large porosity of coatings and improve thermal cycle performance. , to avoid the effect of low stress tolerance
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[0032]The preparation method of the composite structural environmental barrier coating provided by the embodiment of the present invention includes the following steps: using the plasma spraying-physical vapor deposition method, preparing an Si coating on the surface of the base layer in sequence, and preparing a Si coating on the side of the Si coating away from the base layer The surface of the mullite coating and the Yb of the layer / column composite structure prepared on the surface of the mullite coating on the side away from the Si coating 2 SiO 5 coating.
[0033] Optionally, the raw material of the matrix includes a silicon carbide-based composite material, and the silicon carbide-based composite material includes a SiC / SiC composite material. Among them, the first SiC is silicon carbide fiber, and the second SiC is silicon carbide ceramic.
[0034] SiC / SiC is a new type of thermal structure / functional material that combines the performance advantages of metal materia...
Embodiment 1
[0059] Using the SiC / SiC composite material as the matrix, use gasoline, acetone and alcohol to decontaminate and clean the matrix in sequence for 10 minutes, then install the matrix on the fixture and place it in a vacuum tank, evacuate the vacuum tank to 0.45mbar, and then backfill it with argon Gas to 38mbar, and then vacuum to 1.45mbar.
[0060] A Si coating with a thickness of 45 μm was prepared on the surface of the cleaned base layer by plasma spraying-physical vapor deposition technology. The plasma spraying conditions in the Si coating preparation process are: the net power of plasma spraying is 36kW, the flow rate of argon in the plasma gas is 78NSPM, the flow rate of hydrogen is 3.5NSPM, the powder feeding rate is 12g / min, the spraying distance is 280mm, the temperature of the substrate It is 890°C.
[0061] A mullite coating with a thickness of 45 μm was prepared on the surface of the Si coating on the side away from the base layer by plasma spraying-physical vapo...
Embodiment 2
[0065] Using the SiC / SiC composite material as the substrate, use gasoline, acetone and alcohol to decontaminate and clean the substrate by ultrasonic for 15 minutes, then install the substrate on the fixture and place it in a vacuum tank, evacuate the vacuum tank to 0.55mbar, and then backfill it with argon Gas to 42mbar, and then vacuum to 1.55mbar.
[0066] A Si coating with a thickness of 55 μm was prepared on the surface of the cleaned base layer by plasma spraying-physical vapor deposition technology. The plasma spraying conditions in the Si coating preparation process are: the net power of plasma spraying is 40kW, the flow rate of argon gas in the plasma gas is 82NSPM, the flow rate of hydrogen gas is 4.5NSPM, the powder feeding rate is 16g / min, the spraying distance is 320mm, the temperature of the substrate It is 910°C.
[0067] A mullite coating with a thickness of 55 μm was prepared on the surface of the Si coating on the side away from the base layer by plasma spr...
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Abstract
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