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Nanostructured lithium orthosilicate ceramic spheres used for tritium propagation and preparation method thereof

A nanostructure, lithium orthosilicate technology, applied in the field of tritium breeding materials, can solve the problems of material hardening and embrittlement, ceramic breakage or pulverization, tritium release rate reduction, etc., to ease the growth of grain size and reduce sintering temperature, to avoid the effect of significant growth

Active Publication Date: 2017-05-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although a lot of research work has been done on the preparation of lithium orthosilicate ceramic pellets and its tritium-releasing performance at home and abroad, the grain size of the prepared lithium orthosilicate ceramics is all in the micron scale range, and the tritium within this size range The grain size of breeding ceramics is too large, which limits its application as a tritium breeding agent due to the following problems: (1) after tritium is generated, the diffusion distance from the inside of the grain to the grain boundary is too long, thereby reducing the release rate of tritium; 2) Irradiation will lead to material hardening and embrittlement, and make its mechanical properties worse and shorten its life; (3) Lithium ceramics are prone to swelling during the irradiation process, which affects the performance of tritium production and release, and even causes ceramics to break or Pulverization, thereby reducing the utilization rate of lithium, and unable to achieve normal tritium proliferation

Method used

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  • Nanostructured lithium orthosilicate ceramic spheres used for tritium propagation and preparation method thereof
  • Nanostructured lithium orthosilicate ceramic spheres used for tritium propagation and preparation method thereof
  • Nanostructured lithium orthosilicate ceramic spheres used for tritium propagation and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of precursor powder

[0035]Weigh 6.712g of lithium hydroxide monohydrate and add it to a composite solvent composed of equal volumes of methanol and ethanol, and stir until the lithium hydroxide is completely dissolved to obtain a solution with a lithium ion concentration of 1mol / L; then weigh 2.4g of gas phase two Silicon oxide was added to the above solution to obtain the first mixed solution, and the obtained first mixed solution was transferred to a reaction kettle and heated to 160° C. for 6 hours of reaction; after the reaction was completed, 0.16 g of nanometer titanium dioxide powder (particles) was added to the reaction solution. 21 nm in diameter), stirred at room temperature for 30 minutes to obtain the second mixed solution, and then put the second mixed solution in a 70°C constant temperature blast drying oven to dry for 12 hours, and then grind the dried material to obtain the precursor powder;

[0036] (2) Preparation of lithium ceramic p...

Embodiment 2

[0043] (1) Preparation of precursor powder

[0044] Weigh 6.712g of lithium hydroxide monohydrate and add it to a composite solvent composed of equal volumes of methanol and ethanol, and stir until the lithium hydroxide is completely dissolved to obtain a solution with a lithium ion concentration of 0.5mol / L; then weigh 2.4g of the gas phase Silicon dioxide was added to the above solution to obtain the first mixed solution, and the first mixed solution was transferred to the reaction kettle and heated to 140° C. for 6 hours; after the reaction was completed, 0.16 g of nano titanium dioxide powder was added to the reaction solution ( particle size 21nm), stirred at room temperature for 30 minutes to obtain the second mixed solution, then put the second mixed solution in a 70°C constant temperature blast drying oven to dry for 12 hours, and then grind the dried material to obtain the precursor powder ;

[0045] (2) Preparation of lithium ceramic pellets

[0046] Weigh the abov...

Embodiment 3

[0051] (1) Preparation of precursor powder

[0052] Weigh 6.712g of lithium hydroxide monohydrate and add it to a composite solvent composed of equal volumes of methanol and ethanol, and stir until the lithium hydroxide is completely dissolved to obtain a solution with a lithium ion concentration of 1.5mol / L; then weigh 2.4g of the gas phase Silicon dioxide was added to the above solution to obtain the first mixed solution, and the first mixed solution was transferred to the reaction kettle and heated to 160° C. for 6 hours; after the reaction was completed, 0.16 g of nano titanium dioxide powder was added to the reaction solution ( particle size 40nm), stirred at room temperature for 30 minutes to obtain the second mixed solution, then put the second mixed solution in a 70°C constant temperature blast drying oven to dry for 12 hours, and then grind the dried material to obtain the precursor powder ;

[0053] (2) Preparation of lithium ceramic pellets

[0054] Weigh the abov...

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Abstract

The invention discloses nanostructured lithium orthosilicate ceramic spheres used for tritium propagation and a preparation method thereof. The nanostructured lithium orthosilicate ceramic spheres are made by preparing precursor powder with uniform particle size through a solvothermal method, obtaining a lithium ceramic sphere blank with a uniform microstructure through wet moulding, and carrying out two-step sintering. The prepared lithium orthosilicate ceramics is high in purity, good in sphericility, small in hole size and uniform in hole dispersion, has a crystal grain size in nanometer order and allows the radiation resistance, mechanical properties and tritium release properties of tritium propagation ceramics to be improved at the same time.

Description

technical field [0001] The invention belongs to the field of tritium breeding materials, and in particular relates to a nanostructure lithium orthosilicate ceramic ball for tritium breeding and a preparation method thereof. Background technique [0002] As one of the core components of nuclear fusion, the Tritium-producing Test Blanklet Module (TBM) is the key to realizing the "self-sustainability" of controllable nuclear fusion fuel. It can not only realize the proliferation of tritium, but also play a role in energy conversion. As the most important functional material in TBM modules, lithium ceramics have attracted extensive attention from research at home and abroad due to their good stability, high safety and no magnetohydrodynamic effects. The main research object; while lithium orthosilicate (Li 4 SiO 4 ) material has high lithium density, good chemical stability, mechanical stability and radiation stability, can release tritium at a lower temperature, and can reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/626C04B35/64G21B1/11
CPCC04B35/16C04B35/62695C04B35/64C04B2235/3203C04B2235/5454G21B1/11Y02E30/10
Inventor 卢铁城宫溢超杨茂魏念黄章益
Owner SICHUAN UNIV
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