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Method for preparing 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 pore distribution, complex preparation method, and many closed pores, etc., and achieves the effect of high boron carbide content, simple control method, and reduction of the number of pores.

Active Publication Date: 2019-01-29
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing high-strength boron carbide porous ceramics
  • Method for preparing high-strength boron carbide porous ceramics
  • Method for preparing high-strength boron carbide porous ceramics

Examples

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: After pouring the raw materials into the ball milling tank, add 240°C of water, and then enter the stirring mill for 8 hours to make it fully mixed to obtain ceramic slurry;

[0037] 3) Spray granulation: spray granulate the slurry and control the outlet temperature to 100° C. to obtain powder. 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 p...

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 particle size of 100μm and 100g of boron carbide with particle size of 5μm, add 16g of PVB as binder, 12g of silicon carbide sintering aid, add 1.5g of sodium citrate pentahydrate suspending agent, 10g of glycerin as lubricant.

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

[0044] 3) Spray granulation: spray granulate the slurry and control the outlet temperature to 100° C. to obtain powder. Pass the ceramic powder through an 80-mesh standard sieve, and then properly dry it to control its moisture 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 green body, t...

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 g 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 granulate the slurry and control the outlet temperature to 100° C. to obtain powder. Pass the ceramic powder through a 120-mesh standard sieve, and then properly dry it to control its moisture content to 3%.

[0052] 4) Dry pressing molding: the obtained powder is passed through a dr...

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Abstract

The invention discloses a method for preparing high-strength boron carbide porous ceramics. The method comprises the following steps: (1) proportioning raw materials: 80-95wt% of boron carbide powder,0-3.0wt% of suspending agent, 3-15wt% of binder, 5-12wt% of sintering assistant and 0-12wt% of lubricant; (2) adding distilled water into the raw materials, and carrying out mixing in a ball mill orstirring mill, so as to obtain boron carbide slurry, wherein boron carbide granules 1# and boron carbide granules 2# in the boron carbide slurry are uniformly distributed and suspended; (3) subjectingthe boron carbide slurry to spraying granulation, and carrying out drying, so as to obtain boron carbide powder with fluidity; (4) molding the boron carbide powder, so as to obtain boron carbide biscuits; and (5) placing the boron carbide biscuits into a vacuum or atmosphere no-pressure sintering furnace. According to the method, the weak points that the quantity of sealed pores is large, a ceramic matrix is complicated in ingredient, the strength is low, and the like can be overcome, and boron carbide can have more extensive application.

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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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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