Preparation method of SiC coating

A coating and pre-coating technology, applied in the field of SiC coating preparation, can solve the problems of insufficient bonding strength and easy peeling off of the coating, and achieve the effects of good oxidation resistance, high bonding strength and short production cycle

Active Publication Date: 2021-03-23
HUNAN BOWANG CARBON CERAMIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the brushing method is used to prepare the coating on the high-density green body, the coating bonding strength is not enough and it is easy to fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the SiC high temperature resistant coating is prepared by the brushing method, which includes the following steps:

[0048] 1. Pre-coating of high-density body

[0049] 1.1 Put the high-density body including graphite parts and carbon parts into a closed container, vacuumize the container to a vacuum degree of 9Pa, and then continue to pump for 1 hour. Then vacuum inhale polymethylsilane until the polymethylsilane submerges the green body, and then impregnate under vacuum for 30 minutes.

[0050] 1.2 After the impregnation is completed, the green body is transferred to an infrared oven for curing. The curing conditions were set as follows: heating up to 250°C at 1°C / min, and keeping the temperature for 3 hours.

[0051] 1.3 Soak the cured green body in absolute ethanol, put it into the ultrasonic pool, and ultrasonically treat it for 30 minutes under the condition of ultrasonic frequency 46HZ;

[0052] 1.4 Wash the green body 3 times with clean wa...

Embodiment 2

[0066] In this embodiment, the SiC high temperature resistant coating is prepared by the brushing method, which includes the following steps:

[0067] 1. Pre-coating of high-density body

[0068] 1.1 Put the high-density green body, including graphite parts and carbon parts, into a closed container, vacuumize the container to a vacuum degree of 15Pa, and continue to vacuum for 1 hour. The polymethylsilane was sucked in by vacuum until the polymethylsilane submerged the body. Immerse under vacuum for 1h.

[0069] 1.2 After the impregnation is completed, the green body is transferred to an infrared oven for curing. The curing conditions were set as follows: heating up to 270°C at 1°C / min, and keeping the temperature for 2 hours.

[0070] 1.3 Soak the cured green body in absolute ethanol, put it into the ultrasonic pool, and ultrasonically treat it for 30 minutes under the condition of ultrasonic frequency 46HZ;

[0071] 1.4 Wash the green body 3 times with clean water;

[0...

Embodiment 3

[0086] In this embodiment, the SiC high temperature resistant coating is prepared by the brushing method, which includes the following steps:

[0087] 1. Pre-coating of high-density body

[0088] 1.1 Put the high-density green body including graphite parts and carbon parts into a closed container, vacuumize the container to a vacuum degree of 20Pa, and continue to vacuum for 1 hour. The polymethylsilane was sucked in by vacuum until the polymethylsilane submerged the body. Immerse under vacuum for 2h.

[0089] 1.2 After the impregnation is completed, the green body is transferred to an infrared oven for curing. The curing conditions were set as follows: heating up to 220°C at 1°C / min and keeping the temperature for 4 hours.

[0090] 1.3 Soak the cured green body in absolute ethanol, put it into the ultrasonic pool, and ultrasonically treat it for 30 minutes under the condition of ultrasonic frequency 46HZ;

[0091] 1.4 Wash the green body 3 times with clean water;

[0092...

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Abstract

The invention discloses a preparation method of a SiC coating. Polymethylsilane is adopted as a coating main body material, and active metal powder and inert ceramic powder are added, so that the prepared coating slurry can be used for preparing the SiC high-temperature-resistant coating on a high-density green body by adopting a brushing method, and the coating has the characteristics of compactness, high bonding strength, high temperature resistance and oxidation resistance. The SiC high-temperature-resistant coating prepared through the method is compact, high in bonding strength with a high-density green body, not prone to falling off and cracking and good in oxidation resistance at the temperature of 1,600 DEG C or below. The method is low in equipment requirement, short in manufacturing period, high in efficiency and safe and controllable in preparation process. Meanwhile, the prepared SiC coating has high bonding strength with a high-density green body, is compact, is not easy to fall off, has oxidation resistance, and can meet the requirements of high temperature resistance and oxidation resistance at 1600 DEG C.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method for preparing a SiC coating. Background technique [0002] With the rapid development of modern science and technology, industrial production puts forward more and more requirements for structural materials, such as requiring materials to have properties such as high temperature oxidation resistance, corrosion resistance, temperature sudden change resistance and erosion resistance. [0003] Silicon carbide is a compound with extremely strong covalent bonds, and it still maintains a high bond strength under high temperature conditions. This structural feature of silicon carbide determines its series of excellent properties, such as high strength, high temperature resistance, oxidation resistance, excellent chemical stability and the performance of not being corroded by most acid and alkali solutions. [0004] At present, the preparation methods of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/577C04B35/622C04B41/87
CPCC04B35/571C04B35/62222C04B41/87C04B41/5062C04B41/009C04B2235/404C04B2235/3826C04B2235/3886C04B2235/3839C04B2235/3843C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/658C04B35/522C04B35/83C04B41/5059C04B41/5057C04B41/4552C04B41/4554C04B41/4535C04B41/4539C04B41/0072
Inventor 黄能武刘沙赵倩倩
Owner HUNAN BOWANG CARBON CERAMIC CO LTD
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