A high sphericity tritium multiplication agent nanostructure lithium titanate ceramic pellets and preparation method thereof

Abstract

The invention discloses a tritium proliferation agent lithium titanate ceramic pellet with high degree of sphericity and a nano structure and a preparation method of the pellet. Slurry with good fluidity is prepared from pre-mixed liquid which comprises a polymer dispersing agent (fish oil, polyacrylic acid or polyethylene glycol 400) and deionized water and precursor powder, and the lithium titanate ceramic pellet with high degree of sphericity and the nano structure can be further prepared from the obtained slurry through wet forming and high-temperature sintering. Not only can filling of atritium proliferation pellet bed and recovery of residual lithium be facilitated, but also the bulk density of the pellets can be increased so that a tritium proliferation agent with high-density lithium is obtained; furthermore, the thermal stress and radiation rupture of the tritium proliferation agent can be further reduced, and the service life of the tritium proliferation agent can be improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear energy materials, and relates to the preparation of a tritium breeder, in particular to a technology for preparing tritium breeder nanostructure lithium titanate ceramic balls with high sphericity. Background technique [0002] Nuclear fusion energy has attracted more and more attention from human beings due to its advantages of environmental protection, cleanliness, safety and sustainability. Among them, deuterium-tritium fusion is considered to be one of the most easily realized reactions for human beings. Deuterium is abundant in seawater and is very easy to obtain. However, tritium, as a non-naturally occurring isotope of hydrogen, must be obtained through a violent reaction between neutrons and lithium atoms under high temperature and high pressure environments. At present, the ideal lithium sources include solid lithium ceramics and liquid lithium alloys. Compared with liquid lithium alloys...

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Problems solved by technology

However, due to the high surface energy of the nano-lithium titanate ceramic precursor powder (particle size about 30-40nm) obtained by the solvothermal method, it is easy to agglomerate, which leads to the preparation of the nano-lithium titanate ceramic precursor powder slurry prepared by the water system. Poor fluidity in the wet molding process makes the sphericity of the prepared pellets unsatisfactory, which in turn affects the use of later projects (reasons and solutions for the agglomeration of nanopowders, Yang Chunguang et al. Shanxi Chemical Industry 2003.23(1): P.56- 58.)

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