Preparation method of alumina-zirconia ceramic sagger

A technology of zirconia ceramics and alumina, applied in the field of high temperature ceramics, can solve the problems of rough surface, poor bulk density uniformity, loose internal structure, etc., to achieve good alkali corrosion resistance, improve thermal shock stability, and ensure consistency sexual effect

Inactive Publication Date: 2022-02-11
洛阳索莱特材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most of the domestic use of mechanical pressing method to form saggers and crucibles makes their quality very poor; the main performance is: (1), the uniformity of volume density is very poor, resulting in local loose internal structure, making its strength, high temperature resistance, Corrosion resistance and service life fluctuate greatly; (2), the wall thickness of the sagger is relatively large, the weight is too heavy, the heat storage is large, and the energy consumption is large; (3), the surface is rough, easy to stick materials, easy to peel off and drop slag , directly pollute the cleanliness of lithium battery raw materials
Therefore, the performance of domestically produced ceramic saggers cannot meet the needs of high-end lithium battery materials

Method used

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  • Preparation method of alumina-zirconia ceramic sagger
  • Preparation method of alumina-zirconia ceramic sagger
  • Preparation method of alumina-zirconia ceramic sagger

Examples

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preparation example Construction

[0026] The preparation method of alumina-zirconia ceramic sagger, the specific operation steps are as follows:

[0027] (1), raw material ratio:

[0028] According to mass percentage, Al 2 o 3 ≥98.5wt% alumina 55-65%, ZrO 2 +Y 2 o 3 ≥99.5wt% stabilized zirconia 15-25%, ZrO 2 ≥99.5wt% monoclinic zirconia 10-15%, additive 10-15%;

[0029] The crystal phase composition of alumina is α≥90%, and the particle size is D 90 ≤3μm; stable zirconia crystal phase composition of tetragonal phase ≥80%, particle size D 90 ≤3μm; monoclinic zirconia crystal phase composition is monoclinic phase ≥90%, particle size D 90 ≤3μm;

[0030] The additive uses any one of calcium silicate, magnesium silicate, lithium metasilicate or yttrium titanate synthesized by high-purity raw materials through high-temperature calcination; the additive uses high-purity raw materials synthesized by high-temperature calcined calcium silicate, magnesium silicate, Any one of lithium metasilicate or yttrium tit...

Embodiment 1

[0040] The preparation method of alumina-zirconia ceramic sagger, the specific operation steps are as follows:

[0041] Main raw materials and requirements (see the table below):

[0042]

[0043]

[0044] (1), proportioning (mass percentage):

[0045] 55% alumina, 20% stabilized zirconia, 15% monoclinic zirconia, 10% calcium silicate;

[0046] (2), slurry preparation:

[0047] Add the above-mentioned raw materials into a ball mill or a stirring mill according to the proportion, then add 40% of an aqueous solution containing a binder, and mix and mill for 4 hours to make a slurry; the binder is polyvinyl alcohol, and the amount of the binder is 0.4%;

[0048] (3), spray granulation:

[0049] The prepared slurry is made into granulated material through a spray granulator.

[0050] (4), isostatic pressing:

[0051] The granulated material is packed into a rubber mould, and the mold is put into an isostatic press for press molding, and the molding pressure is 120mpa.

...

Embodiment 2

[0055] The preparation method of the alumina-zirconia composite ceramic sagger is characterized in that it comprises the following steps:

[0056] Main raw materials and requirements (see the table below):

[0057]

[0058]

[0059] (1), proportioning (mass percentage):

[0060] 65% alumina, 15% stabilized zirconia, 10% monoclinic zirconia, 10% magnesium silicate;

[0061] (2), slurry preparation:

[0062] Add the above raw materials into a ball mill or a stirring mill according to the proportion, add 50% of an aqueous solution containing a binder, and mix and mill for 5 hours to make a slurry; the binder is pyrrolidone, and the amount of the binder is 0.1%;

[0063] (3), spray granulation: the prepared slurry is made into pellets through a spray granulator;

[0064] (4), isostatic pressing molding: the granulated material is packed in the rubber mould, and mold is put into isostatic pressing machine and pressurized molding, and molding pressure is 140mpa.

[0065] (...

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Abstract

The invention relates to a preparation method of an alumina-zirconia ceramic sagger, and relates to the field of high-temperature ceramics, wherein the preparation method comprises the steps: adding 55-65% of alumina with Al2O3 greater than or equal to 98.5 wt%, 15-25% of stable zirconia with ZrO2+Y2O3 greater than or equal to 99.5 wt%, 10-15% of monoclinic zirconia with ZrO2 greater than or equal to 99.5 wt%, and 10-15% of an additive into a ball mill or a stirring mill according to the mass percentage, then adding an aqueous solution accounting for 35-50% of the total amount of the raw materials, mixing and grinding for 4-6 hours to prepare slurry, preparing a granulated material by using a spray granulator, filling the granulated material into a rubber mold, putting the mold into an isostatic press, carrying out compression molding, and sintering a molded green body at the temperature of 1450-1550 DEG C. The volume density of the prepared compact ceramic sagger is 4.3-4.5 g/cm<3>, the apparent porosity is less than or equal to 0.1%, and the normal-temperature breaking strength is larger than or equal to 400 mPa; and the sagger is resistant to corrosion, impermeable, non-sticky and free of slag falling in the high-temperature using process, and any super-strong corrosive lithium battery positive electrode material can be calcined.

Description

technical field [0001] The invention relates to the field of high-temperature ceramics, in particular to a method for preparing an alumina-zirconia ceramic sagger. Background technique [0002] It is well known that ceramic saggers are key high-temperature containers for calcining positive electrode materials in the lithium battery industry. With the development of lithium batteries, the requirements for ceramic saggers are getting higher and higher. The development trend of the lithium battery industry is manifested in (1) high-end quality requirements: first, the positive electrode material is developing towards high-nickel lithium salt, which requires higher corrosion resistance of the sagger; second, the purity of the material is improving, and the sagger is required not to pollute the material. No sticky material, no peeling off slag; third, the uniformity of the calcination temperature of the material is improving, and the wall thickness of the sagger is required to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/106C04B35/119
CPCC04B35/106C04B35/119C04B2235/5436C04B2235/77C04B2235/96C04B2235/3454
Inventor 张拯李延超魏少西雷复兴马文鹏
Owner 洛阳索莱特材料科技有限公司
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