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Preparation method of graphene-nanosheet-reinforced alumina ceramic

A technology of graphene nanosheets and alumina ceramics, applied in the field of preparation of alumina ceramics, can solve the problems of poor product density, phase change whiskers and particle toughening effects are not particularly obvious, and fiber toughening operation engineering is complicated. , to achieve the effect of good product performance, low cost and high production efficiency

Active Publication Date: 2013-04-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect of phase transformation, whisker and particle toughening is not particularly obvious; the operation engineering of fiber toughening is more complicated, and the density of the product is poor

Method used

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  • Preparation method of graphene-nanosheet-reinforced alumina ceramic
  • Preparation method of graphene-nanosheet-reinforced alumina ceramic
  • Preparation method of graphene-nanosheet-reinforced alumina ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Alumina composite ceramics were prepared by hot pressing and sintering with graphene nanosheets as the reinforcing phase. Weigh 34.965g of alumina powder with a balance, put 245g of alumina balls into a planetary ball milling tank, add 150ml of absolute ethanol as the ball milling medium, and ball mill at 300r / min for 8 hours at room temperature to obtain the required alumina slurry; Then weigh 0.035g graphene nanosheets with a balance, dissolve 0.007g dispersant sodium naphthalenesulfonate in 30ml distilled water with pH=10 to form an aqueous solution, place in an ultrasonic cleaner, and ultrasonically 1 hour; then the graphene The aqueous solution is added to the alumina slurry in the planetary ball mill tank, and the ball mill is 300r / min at room temperature for 8 hours to form a mixed powder; the mixed powder after ball milling is placed in a graphite mold, and then the graphite mold is placed in a multifunctional sintering In the furnace, the temperature was raised...

Embodiment 2

[0029] Alumina composite ceramics were prepared by hot pressing and sintering with graphene nanosheets as the reinforcing phase. Weigh 34.93g of alumina with a balance, put 245g of alumina ball milling balls into a planetary ball milling tank, add 150ml of absolute ethanol as the ball milling medium, and ball mill at 300r / min for 9 hours at room temperature to obtain the required alumina slurry; Weigh 0.07g of graphene nanosheets with a balance, dissolve 0.014g of dispersant sodium naphthalenesulfonate in 35ml of distilled water with pH=10 to form an aqueous solution, place it in an ultrasonic cleaning device, and ultrasonicate for 2 hours; then the graphene aqueous solution Add to the alumina slurry in the planetary ball mill tank, and ball mill at room temperature for 9 hours at 300r / min to form a mixed powder; put the mixed powder after ball milling into a graphite mold, and then place the graphite mold in a multifunctional sintering furnace In the process, the temperature ...

Embodiment 3

[0031] Alumina composite ceramics were prepared by hot pressing and sintering with graphene nanosheets as the reinforcing phase. Weigh 34.825g of alumina with a balance, put 245g of alumina ball milling balls into a planetary ball milling tank, add 100ml of absolute ethanol as the ball milling medium, and ball mill at 300r / min for 8.5 hours at room temperature to obtain the required alumina slurry; Weigh 0.175g of graphene nanosheets with a balance, dissolve 0.035g of dispersant sodium naphthalenesulfonate in 90ml of distilled water with pH=12 to form an aqueous solution, place it in an ultrasonic cleaner, and ultrasonicate for 1.5 hours; then the graphene aqueous solution Add it to the alumina slurry in the planetary ball mill tank, and ball mill it at 300r / min for 8.5 hours at room temperature to form a mixed powder; put the mixed powder after ball milling into a graphite mold, and then place the graphite mold in a multifunctional sintering furnace In the process, the temper...

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Abstract

The invention discloses a preparation method of graphene-nanosheet-reinforced alumina ceramic, which uses graphene nanosheets as a reinforcing phase and alumina as a substrate. The method comprises the following steps: filling alumina powder into a planetary ball mill tank using alumina balls as milling balls, thereby obtaining required alumina slurry; dissolving graphene nanosheets and a dispersing agent sodium naphthalene sulfonate in alkaline distilled water to form a water solution, applying ultrasonic in a ultrasonic cleaning instrument, pouring into the alumina slurry, mixing and carrying out ball milling; and putting the powder mixture of the two substances in a graphite mold, carrying out hot pressed sintering in a multifunctional sintering furnace, keeping the temperature for some time, stopping heating, and naturally cooling to room temperature to obtain the finished product. The method disclosed by the invention is simple, and can easily implement large-scale production; and the product has the advantages of high strength, high toughness and lower cost.

Description

technical field [0001] The invention relates to a method for preparing inorganic non-metallic materials, in particular to a method for preparing alumina ceramics reinforced by graphene nanosheets. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms, a two-dimensional material with a thickness of only one carbon atom. Graphene is currently the thinnest but also the hardest nanomaterial in the world. It has excellent mechanical properties. Its Young's modulus is about 1TPa, which is equivalent to that of single-walled carbon nanotubes, and its strength is about 130180GPa. Graphene nanosheet is a two-dimensional graphite nanomaterial with a thickness of nanometer scale, which is stacked by a single layer of carbon atom planar structure graphene. Therefore, graphene nanosheets have extremely high potential in toughening ceramics. [0003] At present, the toughening methods of ceramic materials include: phase tra...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 毕见强陈亚飞油光磊尹崇龙
Owner SHANDONG UNIV
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