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Cellulose nanocrystalline-modified ceramic blank and preparation method thereof

A ceramic green body and cellulose technology, which is applied in the field of high-performance ceramic green body and its preparation, can solve the problems such as the performance gap of ceramic green body, and achieve the effects of simplifying the industrial production process, enhancing water retention, and improving mechanical properties

Active Publication Date: 2017-03-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-toxic gelling agents such as N'N-dimethylacrylamide and N-methylolacrylamide have similar characteristics to acrylamide systems, but the performance of ceramic green bodies prepared by them is still greater than that of acrylamide systems. gap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] ① Accurately weigh 3.75 g of cellulose nanocrystal suspension with a mass fraction of 1.5%, add 3.75 g of N,N-dimethylacrylamide, 0.075 g of N,N-methylene bisacrylamide, and poly Ammonium acrylate 0.3g, after stirring for 10 minutes, adjust the pH value to 9.3 with ammonia water to prepare the premix;

[0035] ②Alumina powder (spherical α-Al 2 o 3 , white powder, d 50 ≈5 μm, α-Al 2 o 3 Content > 99.8%. ) mixed with the premixed solution at a solid-to-liquid volume ratio of 1:1; adding grinding balls at a ball-to-material mass ratio of 1.5:1, ball milling for 30 minutes, and a rotating speed of 500 rpm to prepare a slurry;

[0036] ③ Add 0.0375g of initiator ammonium persulfate to the slurry, stir for 15 minutes and then vacuum defoam, then pour into the mold and heat and solidify at 70°C;

[0037] ④ The cured wet body is demolded, machined, dried at 40°C for 12 hours, and vacuum-dried at 90°C for 24 hours to obtain a high-strength ceramic green body.

Embodiment 2

[0042] ① Accurately weigh 15g of cellulose nanocrystal suspension with a mass fraction of 1.5%, add 25g of distilled water, and stir for 10 minutes; add 7.5g of N,N-dimethylacrylamide, N,N-methylenebis 0.15 g of acrylamide, 0.6 g of ammonium polyacrylate, and after stirring for 10 minutes, adjust the pH value to 9 with ammonia water to prepare a premix;

[0043] ②Alumina powder (spherical α-Al 2 o 3 , white powder, d50≈5μm, α-Al 2 o 3 Content > 99.8%. ) mixed with the premixed solution at a solid-to-liquid volume ratio of 1:1; adding grinding balls at a ball-to-material mass ratio of 1.5:1, ball milling for 30 minutes, and a rotating speed of 400 rpm to prepare a slurry;

[0044] ③Add the initiator ammonium persulfate to the slurry, the solid mass of which is 0.075g, stir for 15 minutes, vacuum defoam, then pour into the mold, heat and solidify at 70°C.

[0045] ④ The cured wet body is demolded, machined, dried at 40°C for 12 hours, and vacuum-dried at 90°C for 24 hours to ...

Embodiment 3

[0050] ① Accurately weigh 30g of cellulose nanocrystal suspension with a mass fraction of 1.5%, add 10g of distilled water, and stir for 10 minutes; add 7.5g of N,N-dimethylacrylamide, N,N-methylenebispropylene Amide 0.15g, ammonium polyacrylate 0.6g, after stirring for 10 minutes, adjust the pH value to 9.2 with ammonia water to prepare a premix;

[0051] ②Alumina powder (spherical α-Al 2 o 3 , white powder, d50≈5μm, α-Al 2 o 3 Content > 99.8%. ) mixed with the premixed solution at a solid-to-liquid volume ratio of 1:1; adding grinding balls at a ball-to-material mass ratio of 1.5:1, ball milling for 30 minutes, and a rotating speed of 400 rpm to prepare a slurry;

[0052] ③Add the initiator ammonium persulfate to the slurry, the solid mass of which is 0.075g, stir for 15 minutes, vacuum defoam, then pour into the mold, heat and solidify at 70°C.

[0053] ④ The cured wet body is demolded, machined, dried at 40°C for 12 hours, and vacuum-dried at 90°C for 24 hours to obta...

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Abstract

The invention discloses a cellulose nanocrystalline-modified ceramic blank and a preparation method thereof. Cellulose nanocrystals are added into a ceramic blank in gelcasting. The cellulose nanocrystalline-modified ceramic blank comprises, by weight, 0.1 to 10 parts of cellulose nanocrystals, 0.1 to 30 parts of organic gel and 70 to 99 parts of ceramic powder. The cellulose nanocrystal has length of 100 to 300nm, a diameter of 10 to 20nm, a slenderness ratio of 10 to 15 and an elastic modulus of 100 to 150 GPa. The drying strength of the ceramic blank with the cellulose nanocrystals is obviously improved. Because the cellulose nanocrystal structure contains a large amount of hydroxyl groups, the cellulose nanocrystal has strong hydrophilicity so that the water retention of the blank is enhanced. After drying for 1 to 3 hours, the toughness of the gel blank is obviously improved and the gel blank has certain bending strength so that the difficult problem that the gel blank easily adheres to a mold in a punching process is solved. The preparation method can directly shape the gel blank and greatly simplifies the industrial production process.

Description

technical field [0001] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to a high-performance ceramic green body and a preparation method thereof. Background technique [0002] Ceramic materials have high hardness and brittleness, and are difficult to process later, so there are few molding methods for ceramic blanks. For special ceramics with complex shapes and precise dimensions, the molding methods become complicated and difficult. Operation greatly affects the quality and productivity of ceramic products. Injection molding technology is a near net size precision molding technology (U.S.Patent: 4894194; U.S.Patent: 5028362) invented by Oak Ridge National Laboratory in the early 1990s, which combines polymer chemistry theory with ceramic grouting Combining molding methods, organic monomers are polymerized under the conditions of initiators and catalysts to form a three-dimensional network structure, so that ceramic slurr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/634C04B35/636
CPCC04B35/10C04B35/622C04B35/63444C04B35/6365C04B2235/96C04B35/111C04B35/14C04B35/185C04B35/486C04B35/583C04B35/62615C04B35/6263C04B35/62635C04B35/62685C04B35/632C04B2235/448C04B2235/5436C04B2235/5445C04B2235/6023C04B2235/604C04B2235/606C04B2235/61C04B35/62655C04B35/6269C04B2235/3217C04B2235/3244C04B2235/3418C04B2235/3463C04B2235/386
Inventor 邓腾飞王艳娟林宁徐晓虹
Owner WUHAN UNIV OF TECH
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