A high-temperature cracking treatment method for sic composite fiber winding cladding

A composite fiber, high temperature pyrolysis technology, applied in the direction of reducing greenhouse gases, measuring distance, instruments, etc., can solve problems such as zirconium alloy corrosion

Active Publication Date: 2020-02-21
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the service life of the zirconium alloy cladding is affected by the corrosion performance of the material, that is, oxidation in the reactor coolant, especially the absorption of hydrogen, and once it encounters high temperature steam, the corrosion of zirconium alloy will be more rapid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of pyrolysis treatment method of SiC composite fiber winding cladding according to the present invention, it comprises the following steps:

[0024] Step 1: place the cladding preform formed by winding the SiC composite fibers in a high-temperature sintering furnace, evacuate to below 20Pa, fill with argon to the standard atmospheric pressure, evacuate and fill with argon again, and repeat 3 times;

[0025] Step 2: Continue to feed argon to make the furnace body reach a slightly positive pressure of 0.1MPa, keep the state of argon passing in and out and start to heat up, the argon passing in and outflow is 5L / min, and the heating rate is 10°C / min;

[0026] Step 3: when the temperature reaches 1200°C, keep the temperature for 2 hours, so that the cladding preform after the SiC composite fiber is wound has a cracking reaction;

[0027] Step 4: After reaching the holding time, stop heating, continue to pass argon gas, the sample is slowly cooled down with the furnac...

Embodiment 2

[0032] A kind of pyrolysis treatment method of SiC composite fiber winding cladding according to the present invention, it comprises the following steps:

[0033] Step 1: Place the cladding preform formed by winding the SiC composite fibers in a high-temperature sintering furnace, evacuate to below 20Pa, fill with argon to the standard atmospheric pressure, evacuate and fill with argon again, and repeat this twice;

[0034] Step 2: Continue to feed argon to make the furnace body reach a slightly positive pressure of 0.105MPa, keep the state of argon being passed in and out, and start to heat up.

[0035] Step 3: When the temperature reaches 1000°C, keep the temperature for 2 hours, so that the cladding preform after the SiC composite fiber is wound has a cracking reaction;

[0036] Step 4: After reaching the holding time, stop heating, continue to pass argon gas, the sample is slowly cooled down with the furnace, and the furnace is released when it reaches room temperature.

Embodiment 3

[0038] A kind of pyrolysis treatment method of SiC composite fiber winding cladding according to the present invention, it comprises the following steps:

[0039] Step 1: place the cladding preform formed by winding the SiC composite fibers in a high-temperature sintering furnace, evacuate to below 20Pa, fill with argon to the standard atmospheric pressure, evacuate and fill with argon again, and repeat this for 4 times;

[0040] Step 2: Continue to feed argon to make the furnace body reach a slight positive pressure of 0.1MPa, keep the state of argon passing in and out and start to heat up, the argon passing in and outflow is 10L / min, and the heating rate is 15°C / min.

[0041] Step 3: when the temperature reaches 1600 °C, keep the temperature for 1 hour, so that the cladding preform after the SiC composite fiber is wound has a cracking reaction;

[0042] Step 4: After reaching the holding time, stop heating, continue to pass argon gas, the sample is slowly cooled down with th...

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PUM

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Abstract

The invention provides an SiC composite fiber winding cladding high-temperature cracking treatment method, which comprises the following steps of 1, putting a cladding prefabricated element formed by SiC composite fiber winding into a high-temperature sintering furnace; performing vacuuming to a value below 20Pa; 2, continuously introducing argon gas so that a furnace body reaches the micro-positive pressure of 0.1 to 0.105MPa; maintaining the introduction and flow-out state of the argon gas and starting to raise the temperature, wherein the argon gas introduction and flow-out quantity is 1 to 10L / min, and the temperature rise speed is 3 to 15 DEG C / min; 3, when the temperature reaches 1000 to 1600 DEG C, performing heat insulation for 1 to 2h, so that an SiC composite fiber winding cladding prefabricated element takes a cracking reaction; 4, after the heat insulation time is reached, stopping heating; continuously introducing argon gas; slowly lowering the temperature of a sample along with the furnace. The technical method of the SiC composite material cladding pipe cracking is designed; obvious SiC products are obtained inside the cracked cladding pipe; after the process cracking, the cladding pipe is subjected to subsequent gas phase seepage, the ceramic phenomenon is obvious; the relative density can reach 85 percent or higher.

Description

technical field [0001] The invention belongs to the field of manufacturing technology of novel core cladding materials, in particular to a high-temperature pyrolysis treatment method of SiC composite fiber winding cladding. Background technique [0002] Currently, all commercial LWR fuel claddings are Zr-based alloys. After more than 50 years of research and application of this family of materials, the performance of nuclear fuel and the reliability of such fuel cladding have been greatly improved. However, the service life of zirconium alloy cladding is affected by the corrosion properties of the material, that is, oxidation in the reactor coolant, especially the absorption of hydrogen, and the corrosion of zirconium alloy will be more rapid once it encounters high temperature steam. At the same time, with 235 The further increase of U enrichment, or the further increase of the amount of fission products in the fuel due to changes in other aspects, requires the developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/80C04B35/622G21C3/07
CPCC04B35/565C04B35/622C04B35/806C04B2235/614C04B2235/6562C04B2235/6567C04B2235/658C04B2235/77G21C3/07Y02E30/30
Inventor 郭洪卢永恒刘建成贺进明孟莹刘伟
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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