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Composite saggar as well as preparation method and application thereof

A saggar and particle size technology, applied in the field of refractory materials, can solve the problems of affecting the service life of the saggar, spalling, cracking, and low service life of the saggar, and achieve the effects of high cost performance, not easy to break, and good dimensional stability.

Active Publication Date: 2018-05-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 saggar as well as preparation method and application thereof
  • Composite saggar as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0079] The present invention also provides a kind of preparation method of above-mentioned composite sagger, comprising the following steps:

[0080] (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;

[0081] (b) uniformly mix the fabric raw materials of formula quantity, then add binding agent and mix again uniformly to obtain fabric compound;

[0082] (c) Add base material mixture and fabric mixture to mold successively, then molding obtains blank;

[0083] (d) curing the blank for 10-14 hours, then drying, and finally firing at a temperature of 1360-1410° C. for 3-5 hours to obtain the composite sagger.

[0084] The above curing time is typically but not limited to 10 hours, 10.5 hours, 11 hours, 11.5 hours, 12 hours, 12.5 hours, 13 hours, 13.5 hours or 14 hours. The curing method can be done according to the commonly used methods in this field, such as curing in a dry...

Embodiment 1

[0092] Embodiment 1 corundum fabric

[0093] A composite sagger, including a base material and a corundum fabric, the mass ratio of the base material and the corundum fabric is 7:3, and the base material is mainly prepared from the following base material raw materials in parts by mass: 8 parts of kaolin, 6 parts of sillimanite , 6 parts of alumina with particle size not greater than 46.9 μm, 12 parts of corundum with particle size not greater than 46.9 μm, 10 parts of andalusite with particle size not greater than 0.5 mm, 15 parts of mullite with particle size not greater than 1 mm, particle size 8 parts of mullite with a particle size of 1-2 mm and 6 parts of corundum with a particle size not greater than 1 mm;

[0094] The corundum fabric is mainly prepared from the following fabric raw materials in parts by mass: 10 parts of alumina with a particle size not greater than 0.7 μm, 5 parts of α-alumina with a particle size not greater than 46.9 μm, and 20 parts of corundum wit...

Embodiment 2

[0095] Embodiment 2 corundum fabric

[0096] A composite sagger, including a base material and a corundum fabric, the mass ratio of the base material and the corundum fabric is 9:1, and the base material is mainly prepared from the following base material raw materials in parts by mass: 12 parts of kaolin and 10 parts of sillimanite , 14 parts of alumina with particle size not greater than 46.9 μm, 22 parts of corundum with particle size not greater than 46.9 μm, 20 parts of andalusite with particle size not greater than 0.5 mm, 25 parts of mullite with particle size not greater than 1 mm, particle size 12 parts of mullite with a particle size of 1-2 mm and 14 parts of corundum with a particle size not greater than 1 mm;

[0097] The corundum fabric is mainly prepared from the following fabric materials in parts by mass: 20 parts of alumina with a particle size not greater than 0.7 μm, 15 parts of α-alumina with a particle size not greater than 46.9 μm, and 30 parts of corundu...

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Abstract

The invention relates to the field of refractory materials and particularly provides a composite saggar as well as a preparation method and an application thereof. The composite saggar comprises a bottom material and a surface material. The bottom material is mainly prepared from kaolin, sillimanite with specific particle size, aluminum oxide with specific particle size, corundum with specific particle size, andalusite with specific particle size and mullite with specific particle size. The raw materials of the base material have rich source and low cost, so that the cost of the bottom material is lower. The surface material is mainly prepared from a corundum surface material, a spinel surface material, a zirconium oxide surface material, a zirconium silicate-zirconium oxide surface material or a corundum-spinel surface material. All the raw materials of the surface material cooperate with one another, so that the surface material has good corrosion resistance. The composite saggar haslower cost, good corrosion resistance and the advantage of long service life.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a composite sagger, its preparation method and application. 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 sagger consump...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185C04B35/101C04B35/622H01M4/04H01M10/0525
CPCC04B35/101C04B35/185C04B35/622C04B35/66C04B2235/3217C04B2235/3418C04B2235/3463C04B2235/349C04B2235/402C04B2235/96H01M4/04H01M10/0525Y02E60/10
Inventor 王家邦
Owner ZHEJIANG UNIV
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