Method and apparatus for preparing Li-B alloy by vacuum smelting

Abstract

The invention discloses a method and a device for preparing Li-B alloy by vacuum smelting, pertaining to the metallurgy technology field. The device is a vacuum smelting furnace, a temperature-control thermocouple is arranged at the outer side of a crucible, a stirring paddle is arranged at the central position of the smelting furnace, a temperature thermocouple is arranged at the bottom end of the stirring paddle, an incident light port and an observation port are arranged on the upper surface of the furnace cover, a vacuum-pumping and argon channel is arranged at the upper end of the side of the furnace body, and an air-cooling device is arranged at the corresponding position of the argon channel. Li and B powder are put into the iron crucible, protected in high vacuum atmosphere, heated to 400 DEG C and then kept for 10min to 2h, the B powder is introduced with Ar gas to carry out protection when being fully dissolved in the melting of the Li; temperature rise is continued and stirring is reinforced, melt is solidified at the temperature of 530 DEG C, and after the alloy is fully solidified, the temperature rises to 650 DEG C, and the alloy is cooled with the furnace and treated with air-cooling after the temperature of 400 DEG C. The method and the device of the invention have compact and reasonable structure, simple technology, safe use, convenient operation and high-efficient production, thus having generalization and application value.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a method and device for preparing Li-B alloy by vacuum smelting. Background technique [0002] As a new type of thermal battery anode material, Li-B alloy has greatly improved its performance parameters compared with the commonly used Li-Al and Li-Si alloys. However, due to the large difference in melting point between Li and B, they are 180.5℃ respectively. And 2300℃, so it is different from conventional Li-Al, Li-Si alloy smelting. The key to the preparation of Li-B alloy is to strictly control the exothermic rate of 330~350℃ and 530~550℃. Since both reactions are exothermic reactions, if the temperature cannot be controlled, the porous framework structure of lithium boron will be destroyed and it will not be effective. Ground absorption of elemental Li reduces the electrical properties of the alloy. Because of the above reasons, the preparation of Li-B alloys for larg...

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Problems solved by technology

[0003] At present, the preparation of Li-B alloys at home and abroad generally adopts the glove box protected by inert gas. This device is mainly designed for the synthesis of small batch samples in the laboratory. The main problems are: (1) Single temperature control

If the reaction is exothermic or the temperature is not properly controlled, and the reaction in the first temperature zone is not completely completed, it will rise to the second temperature zone, which will make the product of the first stage become some inactive substances, and the next step of the reaction cannot be carried out. ; If the second stage is not controlled and the temperature rises sharply, the porous structure of the lithium-boron compound will be destroyed, making it unable to effectively absorb the remaining single substance Li in the alloy, resulting in a decrease in the performance of the alloy electrode

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