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Graphene-ceramic composite material and preparation method thereof

A ceramic composite material and composite material technology are applied in the field of graphene-ceramic composite material and its preparation, which can solve the problems of poor thermal stability of zirconium dioxide, underdeveloped pores, small specific surface, etc. Excellent ablation performance, increasing the effect of three-phase interface

Active Publication Date: 2013-08-28
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventional zirconia has poor thermal stability, small specific surface area, and underdeveloped pores, which limit its performance and application.

Method used

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  • Graphene-ceramic composite material and preparation method thereof
  • Graphene-ceramic composite material and preparation method thereof
  • Graphene-ceramic composite material and preparation method thereof

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preparation example Construction

[0032] The preparation method of graphene-ceramic composite material of the present invention, comprises the steps:

[0033] 1) Preparation of graphene oxide-metal oxide composites:

[0034] The parts by weight are 40-99.85 parts of cerium salt or zirconium salt (cerium chloride, zirconium chloride, cerium nitrate, zirconium nitrate, cerium sulfate, zirconium sulfate, cerium carbonate, zirconium carbonate, cerium acetate, zirconium acetate, cerium oxalate , zirconium oxalate), 0.03-40 parts of additives (the metal salt of additives is chloride, nitrate, sulfate, carbonate, acetate, oxalate of yttrium Y, scandium Sc, samarium Sm or gadolinium Gd The additive metal oxide is the oxide of yttrium Y, scandium Sc, samarium Sm or gadolinium Gd) and graphene oxide with 0.1-30 parts by weight is dissolved in ethanol, and the raw materials are ultrasonically dispersed, and the temperature is Co-decompose into metal oxides at 600-1200°C to obtain composite materials;

[0035] A. First ...

Embodiment 1

[0047] A. First compound cerium salt (or zirconium salt) with additives, and then compound with graphene oxide:

[0048] The method of thermal decomposition of nitrate is adopted, and samarium nitrate is used as an auxiliary agent in this embodiment. Weigh 400mg Ce(NO 3 ) 3 ·6H 2 O and 100mg Sm(NO 3 ) 3 ·6H 2 O, add 100ml of absolute ethanol, ultrasonically disperse for 2h, ball mill at 450r / min for 3.5h, decompose at 700°C to obtain CeO 2 and Sm 2 o 3 mixture. The obtained mixture is fully mixed with 50mg graphene oxide to obtain graphene oxide-CeO 2 Base Composite 237mg. Add 150mg of organic adhesive (PVB and n-butanol solvent with a weight ratio of 1:1) to the powder, mix and grind thoroughly. Among the raw materials, the parts by weight of graphene oxide, cerium nitrate, samarium nitrate and organic adhesive are 10, 80, 20 and 30 parts respectively.

[0049] After drying, use dry pressing method to press under 10MPa, place in 150ml / min H 2 / He mixed gas vacuum...

Embodiment 2

[0054] B. First compound cerium salt (or zirconium salt) with graphene oxide, and then compound with additives:

[0055] The method of thermal decomposition of nitrate is adopted, and gadolinium nitrate is used as an auxiliary agent in this embodiment. Weigh 300mg Ce(NO 3 ) 3 ·6H 2 O and 75mg graphene oxide, add 100ml absolute ethanol, ultrasonically disperse for 2h, ball mill at 450r / min for 3.5h, decompose at 1200°C to obtain CeO 2 and graphene oxide mixture. The resulting mixture was then mixed with 200mg Gd(NO 3 ) 3 .6H 2 O was mixed thoroughly, after adding 100ml of absolute ethanol, ultrasonically dispersed for 2h and ball milled at a speed of 450r / min for 3.5h, decomposed at 1200°C to obtain graphene oxide-CeO 2 Base Composite 264mg. Add 225mg of organic adhesive (PVB and n-butanol solvent with a weight ratio of 0.1:1) to the powder, mix and grind thoroughly. Among the raw materials, the parts by weight of graphene oxide, cerium nitrate, gadolinium nitrate and ...

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Abstract

The invention discloses a preparation method of a graphene-ceramic composite material. The preparation method comprises the following steps of: (1), penetrating cerate (or zircon salt), auxiliaries and graphene oxide through alcohol dissolving auxiliaries, ultrasonically dispersing the materials uniformly for co-decomposing into metal oxides to obtain a composite material; (2), adding organic adhesive solvent to the graphene-metal oxide composite material for sufficiently mixing and grinding; pressing the mixture into a strip-shaped composite sample by adopting a dry-press process, placing the composite sample in a vacuum tube furnace; and controlling the sintering condition by ventilating a gas mixture of a certain proportion, cooling to the room temperature to obtain the graphene-ceramic composite material. The preparation method of the graphene-ceramic composite material disclosed by the invention can be used for improving the dispersibility and cycling stability of ceramic oxide particles, increasing a three-phase interface among the ceramic oxide particles and improving the electrochemical activity of the composite material, so that the ceramic material has the advantages of being low in density, high in strength, excellent in oxidation resistance, thermal scouring resistance, corrosion resistance and the like.

Description

technical field [0001] The invention relates to a graphene-ceramic composite material and a preparation method thereof, belonging to the technical field of inorganic composite material preparation. Background technique [0002] The 2010 Nobel Prize in Physics was awarded to Andre Geim and Konstantin Novoselov, scientists at the University of Manchester, UK, in recognition of their outstanding research on graphene materials. Graphene is the thinnest and hardest nanomaterial in the world. It is almost completely transparent and absorbs only 2.3% of light; its thermal conductivity is as high as 5300W / (m K), which is higher than that of carbon nanotubes and diamonds. Mobility over 15000cm 2 / (V·s), which is higher than carbon nanotubes or silicon crystals, and the resistivity is only about 10-6Ω·cm, which is lower than copper or silver, and is the material with the smallest resistivity in the world. The application in the field of composite materials is currently one of the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622
Inventor 张云付东升杨阳
Owner SHAANXI COAL & CHEM TECH INST
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