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Preparation method of lithium-silicate-based gradient ceramic microspheres

A technology of ceramic microspheres and lithium silicate, applied in the field of nuclear materials, can solve the problems of unfavorable storage and transportation, high corrosion rate, etc., and achieve the effects of easy implementation, excellent performance and great practicability

Active Publication Date: 2015-03-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the corrosion rate of lithium silicate to structural materials under high temperature conditions is greater than that of other solid value-added materials, such as lithium metasilicate (Li 2 SiO 3 )
In addition, when lithium silicate is in contact with air, it will react with carbon dioxide in the air, which is not conducive to its storage and transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 1 mol of lithium carbonate to 200 g of deionized water, mix well, then add 1 mol of lithium metasilicate, and mix to obtain a uniform suspension. After adding 10% mass fraction of acrylamide and 1% N-N-methylenebisacrylamide as cross-linking agent, the mixed gel balls of lithium carbonate and lithium metasilicate were prepared by colloidal molding process. Rinse the gel balls with deionized water at a flow rate of 1 liter per minute for 5 seconds, then immerse the gel balls in ethanol for 20 minutes, then take them out and dry them at 60°C, and place the dried microspheres in a horse boiling furnace for calcination at 600°C After 20 hours, continue to heat up to 1000°C for sintering for 2 hours. The surface layer of the obtained lithium silicate gradient ceramic microsphere is a lithium metasilicate protective layer with a thickness of about 20 microns.

Embodiment 2

[0029] Add 1 mol of lithium carbonate to 180 g of deionized water, mix well, then add 1 mol of lithium metasilicate, and mix to obtain a uniform suspension. After adding 10% mass fraction of acrylamide and 1% N-N-methylenebisacrylamide as cross-linking agent, the mixed gel balls of lithium carbonate and lithium metasilicate were prepared by colloidal molding process. Rinse the gel balls with deionized water at a flow rate of 1 liter per minute for 10 seconds, then immerse the gel balls in acetone for 10 minutes, then take them out and dry them at 50°C. The dried microspheres are calcined in a horse boiling furnace at 700°C After 2 hours, continue to heat up to 950°C for sintering for 5 hours. The surface layer of the obtained lithium silicate gradient ceramic microsphere is a lithium metasilicate protective layer with a thickness of about 40 microns.

Embodiment 3

[0031] Add 1 mol of lithium carbonate to 220 g of deionized water, mix well, then add 1 mol of lithium metasilicate, and mix to obtain a uniform suspension. After adding 10% mass fraction of acrylamide and 1% N-N-methylenebisacrylamide as a crosslinking agent, the mixed gel balls of lithium carbonate and metasilicate were prepared by colloidal molding process. Rinse the gel balls with 1 liter per minute of deionized water for 30 seconds, then immerse the gel balls in a mixture of ethanol and acetone for 30 minutes, then take them out and dry them at 40°C, and place the dried microspheres in a horse boiling furnace Calcined at 650°C for 10 hours, then continued to heat up to 1050°C for 1 hour. The surface layer of the obtained lithium silicate gradient ceramic microsphere is a lithium metasilicate protective layer with a thickness of about 100 microns.

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Abstract

The invention relates to a preparation method of lithium-silicate-based gradient ceramic microspheres, belonging to the field of nuclear materials. Lithium carbonate is used as a lithium source, and lithium metasilicate or silicon dioxide is used as a silicon source. The preparation method comprises the following steps: on the basis of preparing Li2CO3+Li2SiO3 or Li2CO3+SiO2 gel spheres by a colloid forming technique, flushing and dissolving lithium carbonate with a certain thickness by using deionized water to leave the lithium metasilicate or silicon dioxide outer layer, impregnating in an organic solvent to exchange out water in the gel spheres, and finally, carrying out high-temperature calcining and sintering in an air atmosphere to obtain the lithium silicate ceramic microspheres with gradient structure. The lithium metasilicate or silicon dioxide protective layer with stable chemical properties, which coats the lithium silicate gradient ceramic microsphere surface, can improve the compatibility between the lithium silicate ceramic microspheres and structural material, isolate the interior lithium silicate from contact with air and perform the moistureproof function, thereby being beneficial to storage and transportation of the lithium silicate ceramic microspheres. The method is simple in technical process, does not need complex or expensive equipment, and can easily implement industrial production.

Description

technical field [0001] The invention relates to a preparation method of a lithium silicate gradient ceramic microsphere as a solid tritium multiplication agent material. The material is used for tritium value-added cladding of a fusion reactor and belongs to the field of nuclear materials. technical background [0002] In order to solve the world's energy and environmental problems, countries regard the development of clean new energy as one of the effective ways to solve the crisis. Among them, nuclear fusion energy is regarded as one of the most attractive energy sources. Thermonuclear fusion requires deuterium (D) and tritium (T) as fuel. Deuterium has abundant reserves in nature, enough for human use for hundreds of millions of years. However, tritium must be obtained artificially, because the half-life of tritium is only 12.5 years, and there are almost no available tritium resources in nature. Tritium is generally produced by 6 Li(n,α)T reaction to achieve. To ach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/622
Inventor 张迎春洪明向茂桥万秀娟
Owner UNIV OF SCI & TECH BEIJING
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