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Method for synergistically toughening ceramic material by graphene and nano zirconia and application thereof

A technology of nano-zirconia and toughened ceramics, which is applied in the field of ceramic tool materials, can solve the problems of microhardness and fracture toughness reduction, and achieve the effects of improving compactness, inhibiting growth, and improving fracture toughness

Inactive Publication Date: 2019-09-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In "Preparation and Properties of Graphene Nanosheet Composite Zirconia Ceramics", Wang Minghui et al. 2 Powder and graphene nanosheets were used as raw materials, and graphene nanosheets composite ZrO was prepared by SPS technology. 2 Ceramics, studies have shown that the introduction of graphene nanosheets significantly inhibits the ZrO 2 However, due to the dispersion problem, its microhardness and fracture toughness are slightly reduced.

Method used

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  • Method for synergistically toughening ceramic material by graphene and nano zirconia and application thereof
  • Method for synergistically toughening ceramic material by graphene and nano zirconia and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for synergistically toughening ceramic materials with graphene and nano-zirconia, comprising the steps of:

[0034] (1) Ultrasonic dispersion of graphene and nano-zirconia in an anhydrous ethanol medium for 2 hours to prepare a suspension with a mass fraction of graphene of 0.4% and a mass fraction of nano-zirconia of 1%;

[0035] (2) the powder of 47.72% aluminum oxide, 50.33% titanium carbonitride, 0.49% magnesium oxide, 0.06% yttrium oxide and the suspension (remainder) of graphene and nano-zirconia that step (1) obtains by mass fraction ) were added together in the ball mill cylinder, the ball mill balls were wear-resistant alumina balls, and the high-energy ball milled for 48 hours to obtain the mixture;

[0036] (3) Dry the mixture after ball milling in step (2) in a vacuum oven at a temperature of 120° C. for 1.5 hours; pass through a 150-mesh sieve after drying;

[0037] (4) Put the composite raw material powder sieved in step (3) into a graphite mold,...

Embodiment 2

[0039] A method for synergistically toughening ceramic materials with graphene and nano-zirconia, comprising the steps of:

[0040] (1) Ultrasonic dispersion of graphene and nano-zirconia in anhydrous ethanol medium for 2.5 hours, to prepare a suspension with a mass fraction of graphene of 1.2% and a mass fraction of nano-zirconia of 0.5%;

[0041] (2) the powder of 46.96% aluminum oxide, 51.23% titanium carbonitride, 0.53% magnesium oxide, 0.08% yttrium oxide and the suspension (remainder) of graphene and nano-zirconia that step (1) obtains by mass fraction ) are added together in the ball mill cylinder, the ball mill balls are wear-resistant alumina balls, and the high-energy ball mill is used for 60 hours to obtain the mixture;

[0042] (3) Dry the mixture after ball milling in step (2) in a vacuum oven at a temperature of 100° C. for 2 hours; pass through a 120-mesh sieve after drying;

[0043](4) Put the composite raw material powder sieved in step (3) into a graphite mo...

Embodiment 3

[0045] A method for synergistically toughening ceramic materials with graphene and nano-zirconia, comprising the steps of:

[0046] (1) Ultrasonic dispersion of graphene and nano-zirconia in anhydrous ethanol medium for 2 hours to prepare a suspension with a mass fraction of graphene of 0.2% and a mass fraction of nano-zirconia of 2.0%;

[0047] (2) the powder of 47.16% aluminum oxide, 50.29% titanium carbonitride, 0.45% magnesium oxide, 0.1% yttrium oxide and the suspension (remainder) of graphene and nano-zirconia that step (1) obtains by mass fraction ) were added together in the ball mill cylinder, the ball mill balls were wear-resistant alumina balls, and the high-energy ball milled for 72 hours to obtain the mixture;

[0048] (3) Dry the mixture after ball milling in step (2) in a vacuum oven at a temperature of 130° C. for 0.5 h; pass through a 180-mesh sieve after drying;

[0049] (4) Put the composite raw material powder sieved in step (3) into a graphite mold, and p...

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Abstract

The invention relates to the technical field of ceramic cutter materials, and in particular relates to a method for synergistically toughening a ceramic material by graphene and nano zirconia and application thereof. The method comprises the following steps: (1) preparing the graphene and the nano zirconia into graphene / nano zirconia suspension with uniform dispersion; (2) mixing the suspension inthe step (1) with alumina powder, titanium carbonitride powder, a sintering aid and a stabilizer, and performing ball milling to obtain a mixed material; (3) drying the mixed material in the step (2), screening, and performing vacuum hot pressing sintering on the obtained target material to obtain the product. The addition of zirconia strengthens the interface between the graphene and matrix crystal grains. Graphene-induced crack deflection, crack bridging and crack bifurcation, crack deflection caused by the nano zirconia and pull-out of graphene sheets, stress-induced phase transformation and compressive stress formed on the surface of a matrix due to phase transformation produce synergistic effects to significantly improve the fracture toughness of the multiphase ceramic material.

Description

technical field [0001] The invention relates to the technical field of ceramic tool materials, in particular to a method and application of graphene and nano-zirconia synergistically toughening ceramic materials. Background technique [0002] In the Background of the Invention, the disclosed information is only intended to increase the understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or in any form to imply that the information constitutes the prior art already known to those skilled in the art. [0003] Compared with cemented carbide tools, ceramic tool materials have higher hardness, wear resistance, heat resistance and low metal affinity. application prospects. However, ceramic tool materials have low fracture toughness and poor thermal shock resistance, which limit their application and promotion. Traditional toughening methods such as particle dispersion toughening and whisker toughening can i...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/56C04B35/622C04B35/626C04B35/645
CPCC04B35/5611C04B35/622C04B35/62605C04B35/645C04B35/806C04B2235/3206C04B2235/3217C04B2235/3225C04B2235/3244C04B2235/425C04B2235/6567C04B2235/661
Inventor 崔恩照赵军
Owner SHANDONG UNIV
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