Composite box bowl, preparation method and application

A technology of saggar and mixed materials, which is applied in the field of refractory materials, can solve the problems of peeling, cracking, low service life of saggar, and affecting the service life of saggar, and achieve the characteristics of not easy to break, good dimensional stability, and small thermal expansion coefficient Effect

Active Publication Date: 2021-03-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Composite box bowl, preparation method and application
  • Composite box bowl, preparation method and application

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preparation example Construction

[0061] In a second aspect, the present invention provides a method for preparing the above-mentioned composite sagger, comprising the following steps:

[0062] (a) mix the base material raw materials of formula quantity uniformly, then add binding agent and mix again uniformly to obtain the base material mixture;

[0063] (b) uniformly mix the fabric raw materials of formula quantity, then add binding agent and mix again uniformly to obtain fabric compound;

[0064] (c) Adding the bottom material mixture and the fabric mixture to the mold in sequence, and then molding to obtain a blank, which is cured, dried and fired to obtain the composite sagger.

[0065] The preparation method of the above-mentioned composite sagger has scientific and reasonable technological steps. Firstly, the bottom material mixture and the fabric mixture are prepared respectively, and then the base material mixture and the fabric mixture are added to the mold in turn, and finally the molding, curing, d...

Embodiment 1

[0074] A composite saggar, comprising a base material and a fabric, the mass ratio of the base material and the fabric is 6:4, the base material is mainly prepared from the following base material raw materials in parts by mass: 8 parts of kaolin, 6 parts of talc, α - 3 parts of alumina, 20 parts of high-alumina bauxite, 6 parts of high-alumina bauxite with a particle size not greater than 0.5 mm, 25 parts of burnt gems with a particle size of not more than 1 mm, and 5 parts of burnt gems with a particle size of 1-2 mm;

[0075] The fabric is mainly prepared from the following fabric raw materials in parts by mass: 15 parts of spinel with a particle size not greater than 13 μm, 3 parts of α-alumina, 20 parts of spinel with a particle size not greater than 46.9 μm, and 20 parts of spinel larger than 1 mm and 30 parts of cordierite with a particle size of 0.5-1.25 mm.

Embodiment 2

[0077] A composite saggar, comprising a base material and a fabric, the mass ratio of the base material and the fabric is 9:3, and the base material is mainly prepared from the following base material raw materials in parts by mass: 16 parts of kaolin, 10 parts of talc, α - 8 parts of alumina, 30 parts of high-alumina bauxite, 14 parts of high-alumina bauxite with a particle size not greater than 0.5 mm, 35 parts of burnt gems with a particle size of not more than 1 mm, and 15 parts of burnt gems with a particle size of 1-2 mm;

[0078] The fabric is mainly prepared from the following fabric raw materials in parts by mass: 25 parts of spinel with a particle size not greater than 13 μm, 8 parts of α-alumina, 30 parts of spinel with a particle size not greater than 46.9 μm, and 30 parts of spinel larger than 1 mm and 40 parts of cordierite with a particle size of 0.5-1.25 mm.

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Abstract

The invention relates to the field of refractory materials, in particular to a combination saggar and a production method and application thereof. The combination saggar comprises a base material anda face material; the base material is mainly prepared from, by specific contents, kaolin, talcum, alpha-alumina, bauxite, bauxite not greater than 0.5 mm in particle size, flint clay not greater than1 mm in particle size, and flint clay 1-2 mm in particle size; the face material is mainly prepared from, by specific contents, spinel not greater than 13 mu m in particle size, alpha-alumina, spinelnot greater than 46.9 mu m in particle size, spinel not greater than 1 mm in particle size, and cordierite 0.5-1.25 mm in particle size. The combination saggar has the advantages of low cost, high cost performance, good corrosion resistance and long service life.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a composite sagger, a preparation method and an application thereof. Background technique [0002] At present, lithium cobaltate and ternary lithium batteries are widely used cathode materials for lithium batteries in China, and most of the cathode materials are produced by high-temperature solid-phase synthesis in refractory kilns. During the synthesis process, bearing Sagger materials for burning 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. Moreover, the average index of domestic and foreign sagge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 王家邦
Owner ZHEJIANG UNIV
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