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Method for preparing sic composite material cladding tube in one step

A composite material and cladding tube technology is applied in the field of one-step preparation of SiC composite cladding tubes, which can solve the problems of large pores of fiber bundles and affect the performance of composite materials, and achieve high density, improved performance, and good continuity. Effect

Inactive Publication Date: 2018-11-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional continuous fiber preforms, the pores between fiber bundles are large, and it is difficult to densify them by chemical vapor infiltration, which seriously affects the performance of composite materials

Method used

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  • Method for preparing sic composite material cladding tube in one step
  • Method for preparing sic composite material cladding tube in one step
  • Method for preparing sic composite material cladding tube in one step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: SiC nanowires were introduced by precursor conversion method, pyrolytic carbon (PyC) interface was selected, and a cladding tube of SiC composite material was prepared.

[0026] Specific implementation method:

[0027] 1. Mix liquid polycarbosilane, ferrocene and xylene, magnetically stir in a water bath, and stir evenly; wherein: the mass ratio of liquid polycarbosilane and ferrocene is 95:5, and the mass fraction of xylene is 10%, The temperature of the water bath is 50°C, and the magnetic force is stirred for 30 minutes;

[0028] 2. Clean the surface of the mold, dry it, and then apply a layer of liquid polycarbosilane solution evenly;

[0029] 3. Put the mold brushed with liquid polycarbosilane solution directly into a tube furnace, under the protection of argon atmosphere, crack at 1500°C for 4 hours, grow SiC nanowires in situ, and the thickness of the obtained SiC nanowire layer is about 100 μm;

[0030] 4. Weave and wind a layer of continuous SiC...

Embodiment 2

[0035] Embodiment 2: SiC nanowires are introduced by coating method, pyrolytic carbon (PyC) interface is selected, and SiC composite cladding tube is prepared.

[0036] Specific implementation method:

[0037] 1. Mix SiC nanowires, PVB (binder) and water uniformly in a certain proportion to prepare a slurry, wherein the content of SiC nanowires is 5wt%, and the content of PVB is 3wt%;

[0038] 2. Clean the surface of the mold, dry it, and then evenly coat a layer of SiC nanowire slurry;

[0039] 3. Put the mold coated with SiC nanowires into an oven to dry, and the thickness of the obtained SiC nanowire layer is about 100 μm;

[0040] 4. Weaving and winding a layer of continuous SiC fibers on the surface of the mold containing SiC nanowires, the thickness of the fiber layer is about 300 μm;

[0041] 5. Ultrasonic cleaning and drying of the woven SiC fiber preform;

[0042] 6. Using the conventional chemical vapor deposition method, a layer of pyrolytic carbon (PyC) interfac...

Embodiment 3

[0045] Example 3: SiC nanowires were introduced by electrophoretic deposition, and the mixed interface of pyrolytic carbon and SiC was selected to prepare a cladding tube made of SiC composite material.

[0046] Specific implementation method:

[0047] 1. Mix SiC nanowires, PVB, n-butanol and water uniformly in a certain proportion to prepare an electrophoretic deposition solution, wherein the content of SiC nanowires is 50g / L, the content of PVB is 15g / L, and the content of n-butanol is 1.0vol%;

[0048] 2. Clean the surface of the mold, dry it, then put it into the electrophoretic deposition device, and deposit it for 15 minutes;

[0049]3. Put the mold with deposited SiC nanowires into an oven to dry, and the thickness of the obtained SiC nanowire layer is about 100 μm;

[0050] 4. Weaving and winding a layer of continuous SiC fibers on the surface of the mold with SiC nanowires deposited, the thickness of the fiber layer is about 300 μm;

[0051] 5. Ultrasonic cleaning a...

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Abstract

The invention relates to a method for preparing a SiC composite material cladded tube by using a one-step method. The method comprises the following step: introducing a layer of a one-dimensional SiC nano material into an inner SiC continuous fiber layer, such as a nano wire and a nanotube. By virtue of the difference of densification speeds of the one-dimensional nano material layer and the continuous fiber woven layer in a chemical vapor infiltration process, gradual densification is achieved from inside to outside, and finally substrates of different layers in the cladded tube can be very good in continuity and very high in density. Therefore, various properties, such as the thermal conduction property and the mechanical property, of a SiC-based cladded tube can be greatly improved.

Description

technical field [0001] The invention belongs to the field of nuclear fuel cladding tube preparation, and relates to a method for preparing SiC composite cladding tubes in one step Background technique [0002] In recent years, with the rapid development of nuclear power technology, nuclear reactor cladding materials have received more and more attention. In traditional reactors, zirconium alloys have been considered as ideal cladding materials. However, since the Fukushima nuclear power accident, people have questioned the safety and reliability of the existing cladding materials under accident conditions, and after the idea of ​​the fourth-generation reactor was put forward, new questions have been raised about the performance of nuclear fuel cladding materials. challenge. Silicon carbide (SiC) ceramics and their composites have excellent high-temperature mechanical stability, corrosion resistance, and radiation resistance, and are considered to be the materials of choice...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
CPCC04B35/565C04B35/622C04B35/80
Inventor 王一光周浩
Owner NORTHWESTERN POLYTECHNICAL UNIV