Aluminium titanate-spinel saggar, preparation method and application thereof

Abstract

The invention relates to the field of refractory kilns and particularly provides an aluminium titanate-spinel saggar, a preparation method and application thereof. The aluminium titanate-spinel saggaris mainly prepared from the following raw materials in parts by mass: 25-35 parts of aluminium titanate, 15-25 parts of spinel with the particle diameter being not more than 1mm, 20-30 parts of spinel with the particle diameter being not more than 46.9mu m, 8-12 parts of titanium dioxide, 12-16 parts of aluminium oxide, 0.5-1.5 parts of magnesium oxide powder and 2-4 parts of yellow dextrin. Thealuminium titanate-spinel saggar provided by the invention has the advantages of strong corrosion resistance, good heat stability, long service life and low use cost, and has the beneficial effects that the source of all the raw materials is wide, and the price is low, so that the production cost of the saggar is also lower.

Description

technical field [0001] The invention relates to the field of refractory kiln furniture, in particular to an aluminum titanate-spinel sagger, a preparation method and an application thereof. Background technique [0002] At present, lithium cobaltate and ternary materials are the cathode materials of lithium batteries widely used in China, and most of the cathode materials are produced by high-temperature solid-phase synthesis in refractory kilns. During the synthesis process, bearing The sagger materials used for firing are generally cordierite, mullite, quartz and corundum. Among these materials, cordierite composite mullite sagger products are the most widely used. This type of sagger is made of cordierite, mullite, and corundum as raw materials, with some clay and micropowder added as a binder, and pressed into shape under a high-tonnage press. After constant temperature curing, it is fired in a refractory kiln. The product is obtained. The average index of sagger consu...

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Problems solved by technology

In actual production, it is often the combined influence of two factors that causes the service life of the sagger to be low

The positive electrode material of the lithium battery first corrodes the sagger, especially the lithium oxide at high temperature has a very high activity, it will react with the refractory material in the sagger, and a liquid phase similar to glass is formed at a high temperature, and these liquid phase components are in the The change of viscosity continuously erodes the solid phase surface of the sagger, and the pores on the surface of the sagger will also provide channels for these corrosion products. As time accumulates, the glassy alkali metal oxides continue to penetrate deeper into the sagger. Infiltration at the place, the channel is getting deeper and deeper, more and more impurities are produced by erosion, and low-melting ore phases such as eucryptite, lithium silicate, and lithium aluminosilicate are formed, and the entry and exit of the sagger in the kiln It is found that the expansion coefficient of the impurity mineral phase is quite different from that of the sagger, and the alternation of cold and heat will cause peeling and cracking on the surface of the sagger, thus affecting the service life of the sagger

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