Preparation method of centimeter-level acicular solid tritium breeding agent lithium titanate single crystal
A lithium titanate, centimeter-scale technology is applied in the field of preparation of centimeter-scale needle-like solid tritium multiplication agent lithium titanate single crystal, which can solve the problems of limited preparation methods and unseen single crystal preparation methods, and achieve crystallization. The effect of high degree, easy promotion and few defects
Active Publication Date: 2020-01-24
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology
Defect-free and grain-boundary-free large-size single-crystal lithium ceramics are ideal objects for this type of research. Due to limited preparation methods, the currently published preparation methods can only obtain submillimeter Li 2 TiO 3 single crystal, while larger-sized Li 2 TiO 3 Single crystal preparation method has not been seen
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[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, and the mode of the present invention includes but not limited to the following embodiments.
[0019] This embodiment provides the specific preparation method of lithium titanate single crystal, such as figure 1 As shown, it includes the following steps:
[0020] (1) Preparation of boron oxide powder: put an appropriate amount of boric acid in a crucible, put it in a 180°C oven for heat treatment for 6 hours, cool to room temperature, and prepare the block B 2 o 3 Grind into 0.1-1.0mm powder for later use;
[0021] (2) Lithium titanate single crystal prepared by solid phase melting method: 1.5g B obtained in (1) 2 o 3 Powder, 0.5~2.0g Li 2 TiO 3 and 0.5~6.0g Li 2 CO 3 Put it into a mortar and grind it evenly, then pour it into a 10mL corundum crucible, put it into a tube furnace and raise the temperature to 1100°C at 5-10°C / min and keep it for 12h, ...
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Abstract
The invention discloses a preparation method of a centimeter-level acicular solid tritium breeding agent lithium titanate single crystal. The preparation method comprises the following steps: (1) preparing boron oxide powder: namely drying boric acid, conducting cooling to room temperature, and conducting grinding into powder for later use; (2) preparing a lithium titanate single crystal by a solid-phase melting method: namely mixing the following raw materials in parts by weight: 0.5-6.0 parts of B2O3 powder, 0.2-2.0 parts of Li2TiO3 and 0.5-6.0 parts of Li2CO3, carrying out uniform grindingto obtain mixed powder, heating the mixed powder to 1000-1100 DEG C, keeping the temperature for 10-12 hours, then carrying out two-stage cooling to 900-1000 DEG C and 600-700 DEG C, and carrying outnatural cooling to room temperature to obtain a solid-phase mixture; and (3) carrying out pickling for removing impurities: namely washing the solid-phase mixture with an H2SO4 solution and deionizedwater in sequence, and carrying out natural air drying to obtain the centimeter-level acicular LiTiO3 single crystal. According to the preparation method, B2O3 is used as a fluxing agent, Li2TiO3 andLi2CO3 are used as raw materials, a solid-phase melting method is adopted, a stage temperature reduction method is adopted to control the temperature reduction process, and the centimeter-level acicular Li2TiO3 single crystal is finally prepared.
Description
technical field [0001] The invention relates to the field of nuclear fusion, in particular to a method for preparing a centimeter-scale needle-shaped solid tritium multiplier lithium titanate single crystal. Background technique [0002] In a fusion reactor, the self-sustainment of tritium is achieved through the nuclear reaction of the tritium breeder with neutrons. Solid-state lithium-based ceramics are widely used in the design of tritium-breeding cladding for fusion reactors in various countries because of their high thermal neutron capture area and good chemical and thermal stability. Among them, Li 2 TiO 3 Ceramic lithium has high atomic density, good compatibility with structural materials, and excellent tritium-releasing ability at low temperature, so it is considered to be one of the ideal candidate materials for tritium breeders. The tritium produced by neutron irradiation gradually reaches the surface of the material through bulk diffusion, grain boundary diffu...
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IPC IPC(8): C30B29/32C30B29/62C30B9/12
CPCC30B9/12C30B29/32C30B29/62
Inventor 李瑞把静文徐劲松闫霞艳唐涛刘毅
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS