Preparation of High Sphericity Li₂TiO₃ Tritium Breeder by Polymer Assisted Sedimentation Method

Abstract:

The tritium breeder materials used in solid tritium breeding blanket of fusion reactor are lithium-based ceramics, like lithium titanate (Li₂TiO₃), lithium orthosilicate (Li₄SiO₄), lithium aluminate（LiA1O₂) and lithium zirconate (Li₈ZrO₆). Among them, Li₂TiO₃ has the advantages of stable chemical property, high mechanical strength and high lithium content, so it has become one of the preferred materials. Based on the design of solid blanket and tritium extraction process, breeder materials need to be made into a certain shape of pebbles. B Spherical breeder is widely used in the design of fusion reactor for the larger specific surface area, more channels between the pebbles to diffuse and release tritium, and easier loading or unloading. However, due to the high requirements of the breeder pebbles, the production control are not complete. In this paper, a new preparation method of ceramic pellets with high sphericity, polymer assisted sedimentation method, was used to prepare ceramic pebbles. The slurry consists of micro-scaled ceramic powder and organic monomers. Spherical droplets of ceramic slurry were obtained by sedimentation method in viscous liquids. The organic monomer contained in the droplets was heated to polymerize into small pellet preforms during the sedimentation process. By optimizing the sintering process, the fabricated pebbles could perform high compressive load (>18 N), spherical shape (0.95~1.02), uniform particle size (0.8~1.2mm) and porosity (15~20 %). The main advantages of this method is the mild preparation conditions (50~110 °C), the simplified transfer and purification process and convenient industrialization.. The obtained product has high spherical shape, uniform particle size, high compactness and mechanical strength.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 692-698
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.692
• Online since: January 2019
• Authors: Chen Zhipeng, Wei Lu*, De Lin Chu, Wei Hua Wang, Wen Jing Pu, Hai Yan Jiang, Zi Hao Pan, Shu Bing Ma, Hai Fei Deng, Jun Li Qi
• Keywords: Blanket, Ceramic Pebbles, Lithium Metatitanate, Polymer, Sedimentation, Tritium Breeder

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