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Preparation method of SiC-based composite ceramic solidified body

A technology of multiphase ceramics and solidified body, applied in radioactive purification, nuclear engineering and other directions, can solve the problems of high disposal cost, many graphite and by-products, and poor solidification of solidified body, etc., and achieves high mechanical strength, excellent chemical stability, Excellent radiation resistance

Active Publication Date: 2019-11-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the solidification treatment of high-radioactive graphite, high-temperature self-propagating synthesis of TiC-Al at home and abroad 2 o 3 Many researches have been done on solidifying high-radioactive graphite based on ceramics, but this method has waste gas (CO, CO 2 etc.), the compactness of the solidified body is poor, there are more unreacted graphite and by-products, and the performance of the solidified body needs to be improved, especially the volume ratio of the solidified body is very large (theoretically, the solidified body is 10.6 times the weight of graphite, and it can actually reach more than 20 times), the disposal cost is extremely expensive

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of a SiC-based composite phase ceramic solidified body, the steps are: using silicon powder, graphite, ZnO, CaO, Al 2 o 3 , SiO 2 As raw material, the formula is ZnO: CaO: Al 2 o 3 : SiO 2 =0.2:0.7:1:6 (molar ratio), Si:C=1.05 (molar ratio), 85wt% (mass percent) (Si+C)+15wt% ZCAS. First weigh ZnO, CaO, Al 2 o 3 , SiO 2 , adopt planetary mill ball mill for 5 hours, the material of ball mill: ball: dehydrated alcohol is 1: 3: 0.8 (mass ratio), oven dry (temperature 80 ℃, time 6 hours), calcining in ceramic fiber furnace, temperature is 1600 ℃, heat preservation for 1 hour, water quenching, pulverization and fine grinding to obtain ZCAS glass powder, then weigh silicon powder and graphite powder, then weigh the prepared ZCAS glass powder and add a mixture of Si and C, and use a planetary ball mill for 5 hours. Material: ball: absolute ethanol is 1: 3: 2 (mass ratio), vacuum drying (first temperature 50 ℃, time 6 hours; then temperature 120 ℃, t...

Embodiment 2

[0033] A preparation method of a SiC-based composite phase ceramic solidified body, the steps are: using silicon powder, graphite, ZnO, CaO, Al 2 o 3 , SiO 2 As raw material, the formula is ZnO: CaO: Al 2 o 3 : SiO 2 =0.4:0.5:1:6 (molar ratio), Si:C=1.05 (molar ratio), 85wt% (mass percent) (Si+C)+15wt% ZCAS. First weigh ZnO, CaO, Al 2 o 3 , SiO 2 , adopt planetary mill ball mill for 5 hours, the material of ball mill: ball: dehydrated alcohol is 1: 3: 0.8 (mass ratio), oven dry (temperature 80 ℃, time 6 hours), calcining in ceramic fiber furnace, temperature is 1600 ℃, heat preservation for 1 hour, water quenching, pulverization and fine grinding to obtain ZCAS glass powder, then weigh silicon powder and graphite powder, then weigh the prepared ZCAS glass powder and add a mixture of Si and C, and use a planetary ball mill for 5 hours. Material: ball: absolute ethanol is 1: 3: 2 (mass ratio), vacuum drying (first temperature 50 ℃, time 6 hours; then temperature 120 ℃, t...

Embodiment 3

[0035] A preparation method of a SiC-based composite phase ceramic solidified body, the steps are: using silicon powder, graphite, ZnO, CaO, Al 2 o 3 , SiO 2 As raw material, the formula is ZnO: CaO: Al 2 o 3 : SiO 2 =0.5:0.4:1:6 (molar ratio), Si:C=1.05 (molar ratio), 85wt% (mass percent) (Si+C)+15wt% ZCAS. First weigh ZnO, CaO, Al 2 o 3 , SiO 2, adopt planetary mill ball mill for 5 hours, the material of ball mill: ball: dehydrated alcohol is 1: 3: 0.8 (mass ratio), oven dry (temperature 80 ℃, time 6 hours), calcining in ceramic fiber furnace, temperature is 1600 ℃, heat preservation for 1 hour, water quenching, pulverization and fine grinding to obtain ZCAS glass powder, then weigh silicon powder and graphite powder, then weigh the prepared ZCAS glass powder and add a mixture of Si and C, and use a planetary ball mill for 5 hours. Material: ball: absolute ethanol is 1: 3: 2 (mass ratio), vacuum drying (first temperature 50 ℃, time 6 hours; then temperature 120 ℃, ti...

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Abstract

The invention discloses a preparation method of a SiC-based composite ceramic solidified body, which is characterized by the following steps: taking ZnO, CaO, Al2O3 and SiO2 as raw materials, ball milling, drying, calcining, ball milling and drying to obtain ZCAS glass; using silicon powder, graphite and ZCAS glass as raw materials, ball milling, drying and calcining to obtain SiC-ZCAS composite powder; adding polyvinyl alcohol sol, mixing, granulating and pressing and forming; performing heat treatment on the formed blank body and placing the blank body into a vacuum hot-pressing sintering furnace for sintering, so as to obtain the SiC-based composite ceramic solidified body. The invention adopts safe and cheap raw materials, simple and practical vacuum hot pressing sintering technology is used to prepare the SiC-based composite ceramic solidified body with excellent radiation stability, chemical stability, mechanical stability and thermal stability at lower temperature. The SiC-basedcomposite ceramic solidified body prepared by the invention is suitable for safely treating high-radioactive graphite waste generated due to decommissioning of a nuclear reactor.

Description

technical field [0001] The invention belongs to the solidification treatment of radioactive waste, and relates to a preparation method of a SiC-based composite ceramic solidified body. It is suitable for ceramic solidification treatment of highly radioactive graphite waste. The SiC-based multiphase ceramic solidified body prepared by the present invention is especially suitable for safe treatment of high-radioactive graphite waste produced due to decommissioning of nuclear reactors, making radioactive 14 C nuclides are stably solidified in the SiC ceramic lattice to meet the requirements of deep geological disposal. Background technique [0002] With the increase in energy demand, the improvement of environmental protection awareness and the accelerated transformation of energy structure, nuclear energy is still the preferred energy source in terms of resources, economy, and safety, but the radioactive waste produced restricts the sustainable development of nuclear science ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573C04B35/577C04B35/575C04B35/622C03C6/04C03C12/00G21F9/30
CPCC04B35/573C04B35/622C04B35/575C04B35/62204C03C1/00C03C12/00G21F9/302C04B2235/36C04B2235/428C04B2235/425C04B2235/656C04B2235/6567C04B2235/6581C04B2235/96C04B2235/9607
Inventor 滕元成王文曹雪吴浪
Owner SOUTHWEAT UNIV OF SCI & TECH
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