TiN/C coated lithium titanate tritium breeding agent and preparation method and preparation device system thereof

Abstract

The invention provides a TiN/C coated Li2TiO3 tritium breeding agent and a preparation method and a preparation device system thereof. The preparation method comprises the following steps: (1) enabling Li2TiO3 particles to be in a fluidized state in a protective atmosphere; (2) on the basis that the step (1) is continuously carried out, mixing the Li2TiO3 particles and carbon source gas to obtainC coated Li2TiO3 particles; (3) on the basis that the step (1) is continuously carried out, mixing the C coated Li2TiO3 particles obtained in the step (2), titanium source gas and nitrogen source gas;and (4) carrying out gas-solid separation to obtain the TiN/C coated Li2TiO3 tritium breeding agent. The device system comprises a stock bin, a fluidized bed coating device, a titanium source gasification device, a product collection device and a tail gas treatment device. The corrosion of Li2TiO3 to a cladding material is overcome, and meanwhile, the stability of the lithium-based ceramic tritium breeding agent in a He-H2/H2O environment is improved.

Description

technical field [0001] The invention belongs to the field of nuclear fusion technology, and relates to a preparation method of an advanced lithium-based ceramic tritium multiplier with a core-shell structure, in particular to a TiN / C-coated Li 2 TiO 3 Tritium breeder and its preparation method and preparation device system. Background technique [0002] In the field of nuclear fusion, Li 2 TiO 3 As one of the candidate materials for solid-state tritium breeding cladding, microspheres have excellent properties such as high Li density, good tritium release performance, high compressive strength, and good moisture resistance. However, with the deepening of the research, it was found that in the actual service process, Li 2 TiO 3 The microspheres corrode the cladding material, forming a brittle oxide corrosion layer, which deteriorates the mechanical properties of the cladding material. Especially in He-H 2 In the cleaning atmosphere, this corrosion phenomenon is more obv...

AI Technical Summary

Problems solved by technology

However, the invention also has the problem that lithium titanate ceramic balls are in direct contact with the cladding material during use, which is likely to cause corrosion of the cladding material

[0008] CN108550404A discloses a fluid state tritium breeding ceramic composite material, the fluid state tritium breeding ceramic composite material is formed by mixing liquid and solid phases, which can eliminate the magnetohydrodynamics of existing liquid metal or molten salt tritium breeding agents The resistance effect and the corrosion effect on the cladding structure material can also eliminate the problems of low tritium release efficiency, low heat transfer, fragility, and blockage of the carrier gas channel caused by lithium volatilization.

However, the cost of the invention is high, it is difficult to achieve large-scale mass production, and it is impossible to fundamentally avoid the element diffusion between the tritium breeder and the cladding material, and there is still the problem of cladding material corrosion in long-term use.

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