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Silicon carbide rod high temperature protective coating and preparation method thereof

A technology of protective coating and silicon carbide rod, which is applied in the field of silicon carbide rod high-temperature protective coating and its preparation, can solve the problem of silicon carbide rod oxidation corrosion, coating does not play a good role in anti-oxidation and anti-corrosion protection, silicon carbide The use of carbon rods has limited life extension and other issues, to achieve the effects of prolonging service life, improving anti-oxidation and anti-corrosion effects, and improving protection capabilities

Active Publication Date: 2020-09-04
广州昊汉高热科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under complex high-temperature acidic furnace conditions, none of the above-mentioned coatings has a good anti-oxidation and anti-corrosion protection, resulting in the silicon carbide rods being oxidized and corroded quickly, and the life extension of silicon carbide rods is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The invention provides a method for preparing a silicon carbide rod protective coating, comprising the following steps:

[0028] S101: According to the ratio of formula silicon carbide: graphite: alumina: silicon nitride: mullite: aluminum cobalt alloy: ferrosilicon alloy = (12~27): (4~15): (15~27): (1~ 7): (5-16): (5-16): (15-25) Weigh each raw material component, and then put it into a drum mixer for dry mixing for 1.5 hours to obtain Group A powder.

[0029] Wherein, the preparation method of the aluminum-cobalt alloy comprises: mixing industrially pure alumina with a particle size of 240 mesh and industrially pure cobalt oxide with a particle size of 240 mesh according to the ratio of 40%:60%, putting them into a ball mill for ball milling for 4 hours, Then take it out and put it in a ceramic sagger and calcinate it in an electric furnace, raise the temperature to 1200°C at a heating rate of 200°C / h, and keep it warm for 2 hours; naturally cool the calcined product ...

Embodiment 1

[0038] The coating of the present invention was used in the lithium battery industry, and 6 batches were carried out in 2016. specifically,

[0039] This embodiment provides a method for preparing a silicon carbide rod protective coating, comprising the following steps:

[0040] S101: Weigh 690g of silicon carbide, 219g of graphite powder, 141 of silicon nitride, 430 of alumina, 690g of ferrosilicon powder, 240g of mullite powder, and 390g of aluminum-cobalt alloy powder, totaling 2800g, and add the weighed materials into the drum mix Dry-mix in the machine for 2.5 hours, take out and pass through a 200-mesh sieve and pack it into bags for later use to obtain Group A powder.

[0041] S102: Weigh 1500g of solid potassium silicate with a modulus of 3.5, add 7500g of pure water, heat and boil in a stainless steel pot, wait for the potassium silicate to dissolve and put it in a vat to cool, then add 300g of formaldehyde-modified polyvinyl alcohol of group C and stir evenly It is a...

Embodiment 2

[0049] The coating of the present invention was used on silicon carbide rods in calcined electric kilns in the rare earth industry, and 17 batches were carried out from 2016 to 2018. specifically,

[0050] This embodiment provides a method for preparing a silicon carbide rod protective coating, comprising the following steps:

[0051] S101: Weigh 660g of silicon carbide, 240g of graphite, 150g of silicon nitride, 360g of alumina, 660g of ferrosilicon powder, 300g of mullite powder, and 470g of aluminum-cobalt alloy powder, total: 2840g, and add the weighed materials into the drum mix Dry-mix in the machine for 2.5 hours, take out and pass through a 200-mesh sieve and pack it into bags for later use to obtain Group A powder.

[0052] S102: Weigh 1500g of solid potassium silicate with a modulus of 3.5, add 7500g of pure water, heat and boil in a stainless steel pot, wait for the potassium silicate to dissolve and put it in a vat to cool, then add 300g of formaldehyde-modified p...

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Abstract

The invention relates to a high-temperature protective coating for a silicon carbide rod and a preparation method of the high-temperature protective coating. The protective coating is prepared from Agroup of powder and B group of mixed liquid, wherein the A group of powder is selected from silicon carbide, graphite, aluminum oxide, silicon nitride, mullite, aluminum-cobalt alloy and antaciron according to the ratio of (12-27):(4-15):(15-27):(1-7):(5-16):(5-16):(15-25); the B group of mixed liquid is selected from a potassium silicate aqueous solution and formaldehyde modified polyvinyl alcohol according to the mass ratio of (25-30):(70-75); the mass ratio of the A group to the B group is (25-30):(70-75). The novel silicon carbide composite coating disclosed by the invention has the advantages that the antioxidant and anticorrosion effects of the silicon carbide rod in the high temperature acidic medium working environment can be significantly improved and the service life of the silicon carbide rod is greatly prolonged; the maximum operating temperature can reach 1400 DEG C when the thickness of the coating is 20-35 mu m; in addition, the service life of the silicon carbide rod can be prolonged by 50 percent or above.

Description

technical field [0001] The invention relates to the technical field of silicon-carbon rod coatings, in particular to a silicon-carbon rod high-temperature protective coating and a preparation method thereof. Background technique [0002] Silicon carbon rod coating is a synthetic surface film coated on the surface of the heating part after the silicon carbide rod is made, which can prolong the service life of the silicon carbide rod in a special use environment, and can block and accelerate the silicon carbide rod The aging gas protects the role of silicon carbide rods. However, the silicon carbide rod high-temperature protective coating material commonly used in the industry has a single composition, which is not effective in different working media, and has some shortcomings such as limited service life of silicon carbide rods. [0003] Specifically, the high-temperature anti-oxidation and anti-corrosion coating powder used for the original silicon carbide rod is mainly co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B41/009C04B41/5089C04B41/85C04B41/5059C04B41/5001C04B41/5066C04B41/5031C04B41/5024C04B41/5155C04B41/5144C04B24/2623C04B35/565
Inventor 刘琨刘家钟赵京
Owner 广州昊汉高热科技有限公司
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