a kind of sic f /sic composite material two-layer composite cladding tube and preparation method thereof
A technology of composite materials and cladding tubes, applied in the direction of reducing greenhouse gases, nuclear power generation, climate sustainability, etc., can solve the problems of low densification, large porosity, low thermal conductivity, etc., to improve corrosion resistance , Improve the density, improve the effect of mechanical properties
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Embodiment 1
[0067] A method for preparing a SiCf / SiC composite two-layer composite cladding tube, comprising the steps of:
[0068] Step 1: SiC fiber preform cladding tube weaving
[0069] Adopt winding method to wind 1 layer of SiC fiber on graphite mandrel, the outer diameter of described graphite mandrel is 10.0mm, adopt plain weave method to weave 2 layers of SiC fiber cloth on the graphite mandrel wound with SiC fiber again, make it SiC cladding tube preform with an outer diameter of 11.6 mm.
[0070] Step 2: Interface layer preparation
[0071] Using propylene as the precursor gas, hydrogen as the reducing gas, and argon as the dilution gas, the chemical vapor infiltration method is used to deposit an interface layer on the SiC fiber surface of the SiC cladding tube preform to obtain a SiC cladding tube preform with an interface layer. The conditions are: deposition temperature 1000°C, deposition pressure 200±50Pa, deposition time 6h, dilute Ar gas flow: 400ml / min, propylene flow:...
Embodiment 2
[0082] The difference between this example and Example 1 is that the interface layer is co-deposited by pyrolytic carbon and SiC, and the precursor gas for deposition is a mixed gas of propylene and trichloromethylsilane, and the propane and trichloromethylsilane The volume ratio of silane is 1:1, and the deposition conditions are the same as in Example 1.
[0083] The difference between this embodiment and Embodiment 1 is that the carbon nanotube suspension is sprayed four times on the prepared SiC fiber preform to form a carbon nanotube layer, and then an interface layer is deposited on the carbon nanotube layer.
[0084] The preparation method of the carbon nanotube layer is as follows: using an ethanol suspension system of carbon nanotubes with an average length of 100 μm and a diameter of less than 100 nm, the content of carbon nanotubes is 0.8 g / ml, and spraying 4 times on the surface of the preform , after each spraying, under the protection of argon atmosphere, keep wa...
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