Forming method for ceramic hollow balls

A technology of ceramic hollow sphere and forming method, applied in the field of ceramic forming and ceramic hollow sphere forming, can solve the problems of high cost, low green body density, loose sintering, etc. Easy to operate effect

Inactive Publication Date: 2016-10-12
SHAANXI UDC MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the ceramic ball forming process is widely used in daily-use ceramics and industrial ceramics. The main molding methods are direct spheronization of particles, extrusion spheronization, dry pressing, etc. These methods have poor molding uniformity or low green body density. Lead to loose sintering, or the cost is too high, resulting in limited application development of ceramic balls

Method used

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  • Forming method for ceramic hollow balls

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In terms of parts by mass, mix 160g of silicon carbide ceramic micropowder less than 20 microns, 30g of closed-cell pore-forming agent, 20g of calcium chloride, 10g of glass powder, 5g of dispersant and 100g of water, and heat in a water bath To 45°C, stir in a spherical reactor to form a uniform slurry, under stirring, then use a precision peristaltic pump to drop a 6% sodium alginate aqueous solution at a rate of 1.5mL / s, form a ball, filter, and dry , and then sintered in a high-temperature sintering furnace at 900°C for 2 hours to make a density of 1.03g / cm 3 , Silicon carbide ceramic hollow balls with a diameter of 1-3.5mm. Wherein, the closed-cell pore-forming agent is calcium carbonate, and the dispersant is acrylic acid.

Embodiment 2

[0023] In terms of parts by mass, after mixing 160g of silicon carbide ceramic micropowder less than 20 microns, 25g of closed-cell pore-forming agent, 20g of calcium chloride, 10g of glass powder, 5g of dispersant and 100g of water, heat in a water bath To 45°C, stir in a spherical reactor to form a uniform slurry, under stirring, then use a precision peristaltic pump to drop a 6% sodium alginate aqueous solution at a rate of 1.5mL / s, form a ball, filter, and dry , and then sintered in a high-temperature sintering furnace at 900°C for 1.5h to make a density of 1.15g / cm 3 , Silicon carbide ceramic hollow balls with a diameter of 1-3mm. Wherein, the closed-cell pore-forming agent is aluminum powder, and the dispersant is ammonium polyacrylate.

Embodiment 3

[0025] In parts by mass, 400g of silicon carbide ceramic micropowder less than 20 microns, 18g of boron carbide (0.5 micron) micropowder, 55g of closed-cell pore-forming agent, 20g of clay, 60g of calcium chloride, and 12g of dispersant After mixing with 320g of water, heat it in a water bath to 45°C and stir it into a uniform slurry in a spherical reactor. Under stirring, use a precision peristaltic pump to drop a 4% sodium alginate aqueous solution at a rate of 2mL / s , after being formed into balls, filtered, dried, and then sintered in a high-temperature sintering furnace at 1450°C for 0.5h to make a density of 1.85g / cm 3 SiC composite ceramic hollow spheres. Wherein, the pore-closing agent is a mixture of calcium sulfate and aluminum sulfate, and the dispersant is tetramethylammonium hydroxide.

[0026] The diameter of the composite ceramic ball prepared in this example is 1-3.5 mm.

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Abstract

A method for forming ceramic hollow spheres. Ceramic micropowder, pore forming agent, sintering aid, dispersant and calcium salt are formulated into a uniform slurry in a certain proportion, and sodium alginate is precisely controlled by a precision peristaltic pump under heating and stirring in a water bath. The solution is added dropwise to solidify the slurry into balls. After all the slurry is formed into balls, it is filtered, dried, and then sintered into ceramic balls. The size of the obtained ceramic balls is controllable, the gap is adjustable, the roundness is good, and the quality is close to isostatic pressing. Technology, less equipment investment, easy operation, low cost, suitable for various ceramic materials into balls.

Description

technical field [0001] The invention belongs to the field of molding of special ceramics, and relates to a ceramic molding technology, in particular to a molding method of ceramic hollow balls. Background technique [0002] At present, the ceramic ball forming process is widely used in daily-use ceramics and industrial ceramics. The main molding methods are direct spheronization of particles, extrusion spheronization, dry pressing, etc. These methods have poor molding uniformity or low green body density. It leads to loose sintering, or the cost is too high, which limits the development of the application of ceramic balls. [0003] Ceramic balls are widely used in grinding media, filtration, and carriers. In particular, the application of some wave-absorbing ceramic materials in sewage is irreplaceable. How to improve the treatment efficiency of these materials needs to be expanded. Contents of the invention [0004] The object of the present invention is to provide a mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B38/10C04B35/565C04B35/632C04B35/634C04B35/622C04B35/626
CPCC04B38/009C04B35/565C04B35/622C04B35/62695C04B35/632C04B35/63424C04B38/02C04B38/10C04B2235/349C04B2235/36C04B2235/3821C04B2235/444C04B2235/449C04B38/0067
Inventor 王东陈兵邱冰山刘飞张博
Owner SHAANXI UDC MATERIALS TECH CO LTD
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