A kind of preparation method of high-strength boron carbide porous ceramics

A technology of porous ceramics and boron carbide, applied in the field of ceramic molding, can solve the problems of uneven distribution of pores, many closed pores, complicated preparation methods, etc., and achieve the effects of reducing the number of pores, uniform pore size, and simple control methods

Active Publication Date: 2021-07-02
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although various patents have made good progress in porous ceramics and their applications, organic auxiliary materials are usually used as pore-forming raw materials when preparing porous ceramics. The preparation method is more complicated, etc.

Method used

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  • A kind of preparation method of high-strength boron carbide porous ceramics
  • A kind of preparation method of high-strength boron carbide porous ceramics
  • A kind of preparation method of high-strength boron carbide porous ceramics

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1, a kind of preparation method of high-strength boron carbide porous ceramics, its preparation method is as follows:

[0035] 1) Mixing: Weigh 180g of boron carbide with a particle size of 300µm and 20g of boron carbide with a particle size of 10µm, add 12g of water-soluble phenolic resin as a binder and sintering aid, and add 6g of carboxymethyl cellulose to form a 40% The aqueous solution of solid content is used as suspending agent, and 20g glycerol is used as lubricant.

[0036] 2) Ball milling: pour the raw materials into the ball milling tank, add 240°C of water, and then enter the stirring mill for 8 hours to make them fully mixed to obtain ceramic slurry;

[0037] 3) Spray granulation: Spray granulation of the slurry and control the outlet temperature to 100°C to obtain powder. Then pass the ceramic powder through a 60-mesh standard sieve, and then properly dry it to control its water content to 0.5%.

[0038] 4) Dry pressing molding: The obtained ...

Embodiment 2

[0041] Embodiment 2, a kind of preparation method of high-strength boron carbide porous ceramics, its preparation method is as follows:

[0042] 1) Mixing: Weigh 100g of boron carbide with a particle size of 100µm and 100g of boron carbide with a particle size of 5µm, add 16g of PVB as a binder, 12g of silicon carbide sintering aid, add 1.5g of sodium citrate pentahydrate suspending agent, and 10g of glycerin as lubricant.

[0043] 2) Ball milling: Pour the raw materials into the ball milling tank, add 350g of water, and then stir and mill for 24 hours to fully mix to obtain ceramic slurry;

[0044] 3) Spray granulation: Spray granulation of the slurry and control the outlet temperature to 100°C to obtain powder. Then pass the ceramic powder through an 80-mesh standard sieve, and then dry it properly to control its water content to 1.5%.

[0045] 4) Dry pressing molding: The obtained powder is passed through a dry pressing molding equipment to prepare a boron carbide ceramic...

Embodiment 3

[0048] Embodiment 3, a kind of preparation method of high-strength boron carbide porous ceramics, its preparation method is as follows:

[0049] 1) Mixing: Weigh 120g of boron carbide with a particle size of 30µm and 80g of boron carbide with a particle size of 2µm, add 10g of PVA as a binder, 16g of carbon black as a sintering aid, and 15g of glycerin as a lubricant.

[0050] 2) Ball milling: After pouring the raw materials into the ball milling tank, add 400% of water (the weight ratio of raw materials to water is 100:120), and then carry out planetary ball milling, and the ball milling time is 2 hours, so that they are fully mixed to obtain ceramic slurry;

[0051] 3) Spray granulation: Spray granulation of the slurry and control the outlet temperature to 100°C to obtain powder. Then pass the ceramic powder through a 120-mesh standard sieve, and then properly dry it to control its water content to 3%.

[0052] 4) Dry pressing molding: The obtained powder is prepared by dry...

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Abstract

The invention discloses a preparation method of high-strength boron carbide porous ceramics, which comprises the following steps: (1) Raw material ratio: boron carbide powder 80-95wt%, suspending agent 0-3.0wt%, binder 3-15wt% , sintering aid 5~12wt%, lubricant 0~12wt%; (2) the distilled water added in the above-mentioned raw materials is mixed in ball mill or stirring mill to obtain boron carbide slurry, and No. 1 carbonization in the boron carbide slurry Boron particles and No. 2 boron carbide particles are evenly distributed and suspended; (3) the above-mentioned boron carbide slurry is sprayed and granulated, and dried to obtain fluid boron carbide powder; (4) the above-mentioned boron carbide powder (5) Put the above-mentioned boron carbide green body into a vacuum or atmosphere pressureless sintering furnace. This method can overcome the disadvantages of many closed pores, complex composition of the ceramic matrix, and low strength, so that boron carbide can be used more widely.

Description

technical field [0001] The invention belongs to the technical field of ceramic molding, and relates to a preparation method of high-strength boron carbide porous ceramics. Background technique [0002] As a new type of material, porous ceramic materials are widely used in practical applications due to their unique structural characteristics. For example, in the metallurgical industry, it is used as a high-temperature filter for molten metal or hot gas. In medicine, it is often used for microbial filtration of clinical germs. Porous ceramic materials are often used as filter membranes, catalysts or It can be used as the carrier of enzymes, or as the matrix of new ceramic-metal composite materials, etc. Therefore, porous materials have played a role that cannot be ignored in industrial production, environmental governance, medical and health care, etc. Therefore, it is of great practical significance to research and develop new porous ceramic materials and enable them to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/563C04B35/622C04B35/626C04B35/634C04B35/636C04B35/64
CPCC04B35/563C04B35/622C04B35/62605C04B35/63476C04B35/6365C04B35/64C04B38/067C04B2235/602C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/77C04B2235/96C04B38/0074C04B38/0067C04B38/0054
Inventor 邬国平肖清谢方民焦永峰熊礼俊
Owner NINGBO VULCAN TECH CO LTD
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