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Silicon carbide coating for sagger and preparation method of silicon carbide coating

A silicon carbide coating and silicon carbide powder technology is applied in the field of corrosion-resistant materials, which can solve the problems of shortening the service life of the saggar, destroying the microstructure of the saggar, and poor corrosion resistance, so as to improve the service life, reduce the cost, and increase the resistance to corrosion. The effect of high temperature and acid and alkali corrosion resistance

Inactive Publication Date: 2019-11-15
湖南太子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium battery anode material saggers have the problem of poor corrosion resistance. Lithium battery anode materials used for roasting are mostly powdery and have strong penetration ability. Lithium ions in the materials are strongly alkaline substances, which have strong Strong corrosiveness, during the roasting process of lithium battery cathode materials, due to the contact process between lithium ions and saggers, lithium ions can precipitate Si, Al, Mg plasma in mullite, thereby destroying the microstructure of saggers, The saggar suffered from erosion, which significantly shortened the lifespan of the saggar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention discloses a silicon carbide coating used for saggers. The silicon carbide coating comprises the following raw materials in terms of mass fraction:

[0028] 10% of silicon carbide powder with a particle size of 0.1 μm, 20% of silicon carbide powder with a particle size of 0.01 mm, 10% of silicon carbide powder with a particle size of 0.1 mm, waste mullite sagger powder with a particle size of 0.01 μm 20 %, 10% waste mullite sagger powder with a particle size of 0.01mm, 10% alumina powder with a particle size of 1nm, 10% polymethyl silicone resin, 5% deionized water, and 5% polyvinyl alcohol.

[0029] The invention discloses a method for preparing a sagger with a silicon carbide coating, which comprises the following steps:

[0030] Step 1. Mechanically dismantle and pulverize the discarded mullite sagger, and sieve out the discarded mullite sagger powder with a particle diameter of 0.01 μm and the discarded mullite sagger powder with a particle diameter of ...

Embodiment 2

[0036] The invention discloses a silicon carbide coating used for saggers. The silicon carbide coating comprises the following raw materials in terms of mass fraction:

[0037] 20% silicon carbide powder with a particle size of 1.5 μm, 10% silicon carbide powder with a particle size of 0.05 mm, 20% silicon carbide powder with a particle size of 0.5 mm, waste mullite sagger powder with a particle size of 0.1 μm 10 %, 10% waste mullite sagger powder with a particle size of 0.1mm, 10% alumina powder with a particle size of 10nm, 10% polyethyl silicone resin, 5% deionized water, and 5% polyvinyl alcohol.

[0038] The invention discloses a method for preparing a sagger with a silicon carbide coating, which comprises the following steps:

[0039] Step 1, mechanically dismantle and pulverize the discarded mullite sagger, and sieve out the discarded mullite sagger powder with a particle size of 0.1 μm and the discarded mullite sagger powder with a particle size of 0.1 mm;

[0040]Ste...

Embodiment 3

[0045] The invention discloses a silicon carbide coating used for saggers. The silicon carbide coating comprises the following raw materials in terms of mass fraction:

[0046] 10% silicon carbide powder with a particle size of 1.0 μm, 14% silicon carbide powder with a particle size of 0.02 mm, 10% silicon carbide powder with a particle size of 0.2 mm, waste mullite sagger powder with a particle size of 0.05 μm 10 %, 20% waste mullite sagger powder with a particle size of 0.05mm, 20% alumina powder with a particle size of 5nm, 10% polymethyl silicone resin, 5% deionized water, and 1% polyvinyl alcohol.

[0047] The invention discloses a method for preparing a sagger with a silicon carbide coating, which comprises the following steps:

[0048] Step 1. Mechanically dismantle and pulverize the discarded mullite sagger, and sieve out the discarded mullite sagger powder with a particle diameter of 0.05 μm and the discarded mullite sagger powder with a particle diameter of 0.05 mm; ...

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Abstract

The invention discloses a silicon carbide coating for a sagger. The silicon carbide coating comprises silicon carbide powder with a particle size of 0.1-1.5 microns, silicon carbide powder with a particle size of 0.01-0.05 mm, waste mullite sagger powder with a particle size of 0.01-0.1 micron, waste mullite sagger powder with a particle size of 0.01-0.1 mm, aluminum oxide powder, water-nased silicone resin, deionized water and polyvinyl alcohol. The invention also discloses a preparation method of the sagger. The method comprises the following steps: preparing waste mullite sagger powder withdifferent particle sizes; weighing the raw materials and carrying out uniform mixing to obtain a silicon carbide coating; coating the inner surface of a sagger blank with the silicon carbide coating;carrying out natural drying and then carrying out oven drying; and carrying out firing to obtain a finished product. According to the invention, the inner surface of the sagger is coated with the silicon carbide coating, so that performance of high-temperature resistance and acid-alkali resistance of the sagger is improved, recycling of waste mullite saggers is realized, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of corrosion-resistant materials, more specifically, the invention relates to a silicon carbide coating for a sagger and a preparation method of the sagger. Background technique [0002] Mullite material has high refractoriness, good thermal shock stability, low thermal expansion coefficient, good high temperature creep resistance, high wear resistance, peeling resistance, erosion resistance, etc., and its application is extremely wide. Mullite saggers generally use acidic materials as raw materials, which have good resistance to the erosion of acidic materials; alkali-resistant saggers are mainly made by adding some alkaline oxides or partial alkaline materials to the refractory materials, making this Sagger-like has good corrosion resistance to alkaline materials, prolonging the service life of the sagger. With the rapid development of the lithium battery industry, mullite sagger plays a dominant role in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/567C04B35/622C04B41/87
CPCC04B35/565C04B35/62222C04B35/66C04B41/5059C04B41/87C04B2235/3217C04B2235/3463C04B2235/483C04B2235/6562C04B2235/6567C04B2235/9607C04B2235/9692C04B41/0072
Inventor 刘骏刘振华张海
Owner 湖南太子新材料科技有限公司
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