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Preparation method of porous silicon carbide material

A technology of microporous silicon carbide and pore-forming agent, applied in the field of new ceramic materials, can solve the problems of unsuitable dry friction, easy suction on the sealing surface, affecting the service life of the sealing ring, etc., and achieves high hardness, low porosity, and weight light effect

Inactive Publication Date: 2011-05-18
上海德宝密封件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an important part in the industrial field—the mechanical seal ring, the seal ring made of pressureless sintered silicon carbide is commonly used at present. Although the performance of the whole set of seals is greatly improved, it is found that the sealing surface is easy to absorb and wear out during use. It is not suitable for dry friction, not resistant to corrosion, and affects the service life of the sealing ring. The French Saint-Gobain company, which is one of the world's top 500 enterprises in the development of industrial ceramics, is in a leading position and has newly developed a spherical microporous atmospheric pressure sintered silicon carbide ceramic. (SP-SiC)

Method used

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  • Preparation method of porous silicon carbide material
  • Preparation method of porous silicon carbide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a microporous silicon carbide material, the steps are:

[0016] Step 1. Preparation of pore-forming agent: Take 70wt% polyperfluoroethylene propylene resin and 22wt% phenolic resin binder into a high-speed centrifugal dryer and heat to 180°C, add 8wt% methanol and run for 22 hours, The speed of the high-speed centrifugal dryer is 3000 rpm, and then cooled to room temperature:

[0017] Step 2. Preparation of microporous silicon carbide material: put 85wt% of the pressureless silicon carbide powder, 7wt% of the pore-forming agent made in step 1 and 8wt% of methanol into a mixer and stir at 150°C for 2 hours. The rotating speed is 180 rpm;

[0018] Step 3. Take out the microporous silicon carbide material in the blender.

[0019]

Embodiment 2

[0021] A method for preparing a microporous silicon carbide material, the steps are:

[0022] Step 1. Preparation of pore-forming agent: Take 80wt% acrylic resin and 14wt% phenolic resin binder into a high-speed centrifugal dryer and heat to 290°C, add 6wt% ethanol and run for 22-26 hours at high speed The rotational speed of the centrifugal dryer is 4000 rpm and then cooled to room temperature:

[0023] Step 2. Preparation of microporous silicon carbide material: put 90wt% of the pressureless silicon carbide powder, 4wt% of the pore-forming agent made in step 1 and 6wt% of ethanol into a blender and stir at 200°C for 2.5 hours. The rotating speed is 200 rpm;

[0024] Step 3. Take out the microporous silicon carbide material in the blender.

Embodiment 3

[0026] A method for preparing a microporous silicon carbide material, the steps are:

[0027] Step 1. Preparation of pore-forming agent: Take 90wt% methacrylic resin and 7wt% phenolic resin binder into a high-speed centrifugal dryer and heat to 210°C, add 3wt% water and run for 26 hours, then centrifuge at a high speed The speed of the dryer is 5000 rpm, then cooled to normal temperature:

[0028] Step 2. Preparation of microporous silicon carbide material: Put 95wt% of the pressureless silicon carbide powder, 2wt% of the pore-forming agent made in step 1 and 3wt% of water into a mixer and stir at 170°C for 3 hours. The rotational speed is 220 rpm;

[0029] Step 3. Take out the microporous silicon carbide material in the blender.

[0030]

[0031] The physical properties of the microporous silicon carbide material obtained in the present invention are as follows:

[0032]

[0033] The comparison of the obtained microporous silicon carbide material obtained in the prese...

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Abstract

The invention relates to a preparation method of a porous silicon carbide material. The preparation method is characterized by comprising the following steps of: putting acrylic resin and an adhesive into a high-speed centrifugal dryer to heat to 180-210 DEG C and adding a dispersant to operate for 22-26 h; and then, cooling to a room temperature and putting pressureless silicon carbide powder, a pore forming material prepared in the step (1) and the dispersant to a stirrer to stir at a rotating speed of 180-220 turns / min for 2-3 h. The porous silicon carbide material prepared from the pressureless silicon carbide powder in the invention has porous holes smaller than 10 micros, the product has the advantages of high hardness, light weight, low porosity, high corrosion resistance, skimming wear resistance, and the like and can form complicated shapes.

Description

technical field [0001] The invention relates to a method for preparing a microporous silicon carbide material. The material can be made into a seal and is widely used in high-tech fields such as machinery, automobiles, ships, food, chemical industry, petroleum, medicine, aerospace, aviation, etc., and belongs to the new ceramic industry. field of materials technology. Background technique [0002] Silicon carbide material is an atomic crystal composed of Si—C strong covalent bonds, which has high stability. This special structure endows the material with advantages such as high melting point, high hardness, good chemical inertness and corrosion resistance, and is widely used It is used in important fields such as precision bearings, seals, steam turbine rotors, nozzles, heat exchanger components, and nuclear reactor materials. It is considered to be one of the most promising materials for high-temperature structural parts, and may be used in high-efficiency engines and gas t...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/00
Inventor 郑佑俊
Owner 上海德宝密封件有限公司