Device used for sintering sodium-sulfur battery ceramic pipes

Abstract

The invention discloses a device used for sintering sodium-sulfur battery ceramic pipes. The device used for sintering the sodium-sulfur battery ceramic pipes comprises a furnace hearth composed of a furnace bottom and a furnace body, a heating device, a heat preservation layer and a lining. The heat preservation layer and the lining are constructed on the inner wall of the hearth in sequence. The furnace bottom is in a round plate shape. Ceramic pipe green bodies are distributed uniformly and buckled on the furnace bottom in a reversed mode. An inner cavity of the furnace body is in a cylinder shape matched with the shape of the furnace bottom and the top portion of inner cavity of the furnace body is arc. The lining is formed by the laying of special-shaped bricks made of alkalinity high-temperature fire-proof materials. The heating device comprises a plurality of heating rods which are distributed uniformly on the inner wall of the furnace body and made of molybdenum disilicide materials, and thus the temperature difference in the hearth is not less than + / -2 degrees. The device used for sintering the sodium-sulfur battery ceramic pipes is used for sintering the sodium-sulfur battery ceramic pipes in a solid phase alkalinity atmosphere, and a sodium-rich atmosphere in the hearth can be formed. Rapid volatilization of the sodium component in an electrolyte beta aluminum oxide ceramic pipe product in the process of the high-temperature sintering can be restrained. The uniformity of product performances can be improved, the service life of equipment can be prolonged, and operation time and human cost for products to go in and out of the furnace are reduced.

Description

technical field [0001] The invention relates to a sintering device for a ceramic tube of a sodium-sulfur battery. Background technique [0002] Sodium Sulfur Battery (Sodium Sulfur Battery) is based on Na-β″-Al 2 o 3 A secondary battery in which the ceramic tube is used as the electrolyte and diaphragm, the metal sodium is used as the negative electrode material, and the non-metallic sulfur is used as the positive electrode material. It has the advantages of high specific energy, high power discharge, high efficiency, long cycle life, etc., and can be used in power grid peak shaving, new energy access, emergency power supply, power quality optimization and other fields. [0003] Solid electrolyte β-alumina ceramics have good sodium ion conductivity, and their ion conductivity can reach 10 at room temperature. -2 On the order of S / cm, the high-performance β-alumina ceramic tube is the core component of the sodium-sulfur battery. In the application process, β-alumina ceram...

AI Technical Summary

Problems solved by technology

Since the solid electrolyte β-alumina ceramic tube of the sodium-sulfur battery has "sodium vapor" volatilized when fired at high temperature, ordinary alumina hollow spheres or corundum-mullite refractories are used as the lining of the sintering kiln. The corrosion resistance of medium and alkali is extremely poor, which will easily cause the life of the sintering kiln to be short; at the same time, the lining of alumina hollow spheres or corundum-mullite refractory materials will absorb "sodium vapor", which is not conducive to the formation of "sodium vapor" during the sintering process. Sodium rich” atmosphere

In order to form a sodium-rich atmosphere in the furnace during the sintering process and suppress the excessive volatilization of the sodium component in the ceramic tube products, the usual practice is to fill each electrolyte β-alumina ceramic tube with platinum and other precious metals or alkaline high-temperature refractory materials. Sintering in the crucible tooling, which not only increases the cost but also increases the complexity of the firing process

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