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Graphene-zirconium oxide compound material and preparation method of same

A composite material and zirconia technology, applied in the field of ceramic materials, can solve problems such as difficulty in obtaining uniformly dispersed graphene, difficulty in ensuring uniform distribution of graphene, weakening its own mechanical properties, etc., and achieves good reduction effect, few steps, and improved mechanical properties. Effect

Active Publication Date: 2017-07-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, poor thermal shock resistance
However, because graphene is hydrophobic and easy to agglomerate, it is difficult to obtain uniformly dispersed graphene, and it is difficult to ensure that graphene in the final material is uniformly distributed in a single-layer or few-layer form.
In addition, thermally reduced graphene as a toughening phase undergoes two thermal damages during reduction and sintering, making its sp 2 There are relatively many structural defects on the carbon mesh, which weakens its own mechanical properties and weakens its toughening ability

Method used

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  • Graphene-zirconium oxide compound material and preparation method of same
  • Graphene-zirconium oxide compound material and preparation method of same
  • Graphene-zirconium oxide compound material and preparation method of same

Examples

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Effect test

Embodiment 1

[0033] A graphene-zirconia composite material and a preparation method thereof, comprising the following steps and process conditions thereof:

[0034] (1) Dispersion and mixing of ingredients

[0035] According to the total mass percentage of zirconia granulated powder and graphene oxide, the mass ratio: zirconia granulated powder 99.9wt.%, graphene oxide 0.1wt.%; the zirconia granulated powder and graphene oxide are mixed uniformly in water , adding the granulated powder of zirconia to the aqueous suspension of graphene oxide to prepare a mixed powder with uniform dispersion of graphene oxide;

[0036] (2) Sintering mixed powder

[0037] Put the mixed powder in step (1) into a φ20mm graphite mold, adopt spark plasma sintering technology, apply an axial pressure of 30MPa, a sintering heating rate of 100°C / min, a sintering temperature of 1350°C, and a sintering vacuum of 10 -2 Pa, the holding time is 3min, and the graphene-zirconia composite material is prepared.

[0038] T...

Embodiment 2

[0041] A graphene-zirconia composite material and a preparation method thereof, comprising the following steps and process conditions thereof:

[0042] (1) Dispersion and mixing of ingredients

[0043] According to the total mass percentage of zirconia granulated powder and graphene oxide, the mass ratio: zirconia granulated powder 99.99t.%, graphene oxide 0.01wt.%; zirconia granulated powder and graphene oxide are mixed in water , adding the granulated powder of zirconia to the aqueous suspension of graphene oxide to prepare a mixed powder with uniform dispersion of graphene oxide;

[0044] (2) Sintering mixed powder

[0045] Put the mixed powder in step (1) into a φ20mm graphite mold, adopt spark plasma sintering technology, apply an axial pressure of 60MPa, a sintering heating rate of 50°C / min, a sintering temperature of 1550°C, and a sintering vacuum of 10 -3 Pa, the holding time is 5min, and the graphene-zirconia composite material is prepared.

Embodiment 3

[0047] A graphene-zirconia composite material and a preparation method thereof, comprising the following steps and process conditions thereof:

[0048] (1) Dispersion and mixing of ingredients

[0049] According to the total mass percentage of zirconia granulated powder and graphene oxide, the mass ratio: zirconia granulated powder 99.5wt.%, graphene oxide 0.5wt.%; the zirconia granulated powder and graphene oxide are mixed uniformly in water , adding the granulated powder of zirconia to the aqueous suspension of graphene oxide to prepare a mixed powder with uniform dispersion of graphene oxide;

[0050] (2) Sintering mixed powder

[0051] Put the mixed powder in step (1) into a φ20mm graphite mold, adopt spark plasma sintering technology, apply an axial pressure of 40MPa, a sintering heating rate of 150°C / min, a sintering temperature of 1300°C, and a sintering vacuum of 10 -2 Pa, holding time 4min.

[0052] The Raman contrast spectrogram of the graphene-zirconia composite ...

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Abstract

The invention discloses a graphene-zirconium oxide compound material and a preparation method of same. The compound powder is prepared with zirconium oxide granulation powder and graphene oxide as raw materials, wherein the zirconium oxide granulation powder accounts for 99.5-99.99% of the total weight of the two components, and the graphene oxide accounts for 0.01-0.5% of the total weight of the two components. The preparation method includes the steps of: 1) dispersing and mixing the raw materials; and 2) sintering the mixture powder. In the method, the character that the graphene oxide can be reduced to form graphene at high temperature is fully considered, and meanwhile, under a high-pressure and high-vacuum atmosphere in the sintering environment, the graphene oxide is reduced in the zirconium oxide substrate in situ. The method has simple operation steps and high production efficiency and improves mechanical performances of zirconium oxide ceramic.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a graphene-zirconia composite material and a preparation method thereof. Background technique [0002] Zirconia is an important structural and functional material, due to its good mechanical properties, optical properties, electrical properties and chemical stability, zirconia has been widely used. But like almost all ceramic materials, its intrinsic brittleness greatly restricts the further application of zirconia ceramics. In order to improve the toughness of zirconia, generally by doping the zirconia lattice with a stabilizer (Y 2 o 3 , MgO, CaO, CeO 2 etc.), making tetragonal zirconia (t-ZrO 2 ) to monoclinic zirconia (m-ZrO 2 ) transition is stable from 1170 °C down to room temperature, utilizing t-ZrO 2 to m-ZrO 2 Energy is absorbed during the transformation process, reducing the stress concentration at the crack tip of the material and hindering the crack propagatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/64
CPCC04B35/48C04B35/64C04B2235/425C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/666C04B2235/96
Inventor 刘允中曾招余波黄誉郑启凡陈涛
Owner SOUTH CHINA UNIV OF TECH
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