Composite ceramic tool with toughness reinforced by graphene nanosheets and microwave preparation technology of composite ceramic tool

A technology of graphene nanosheets and composite ceramics, which is applied in the field of machining tool manufacturing, can solve problems such as low toughness and low production efficiency, achieve low sintering temperature, short heating time, and improve comprehensive mechanical properties.

Inactive Publication Date: 2016-12-07
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low toughness and low production efficiency of the current ceramic cutting tools, and to prepare a new type of ceramic cutting tools with high comprehensive mechanical properties by using microwave sintering technology

Method used

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  • Composite ceramic tool with toughness reinforced by graphene nanosheets and microwave preparation technology of composite ceramic tool
  • Composite ceramic tool with toughness reinforced by graphene nanosheets and microwave preparation technology of composite ceramic tool
  • Composite ceramic tool with toughness reinforced by graphene nanosheets and microwave preparation technology of composite ceramic tool

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Embodiment Construction

[0025] Weigh graphene nanosheets according to the attached table of the example parameters, and ultrasonically disperse them in 1-methyl-2-pyrrolidone for 2 hours to prepare a suspension; then weigh the submicron Al 2 o 3 , TiC and micron Ni, Mo, Y 2 o 3 and MgO were added to the suspension of graphene nanosheets, ultrasonically dispersed and mechanically stirred for 20 minutes; the mixed solution was added to a planetary ball mill tank, and ball milled for 48 hours; a polyvinyl alcohol solution with a mass concentration of 5wt% was prepared, and after ball milling Add it to the solution for granulation in the first two hours; place the ball-milled mixture in a vacuum oven to dry at 110±10°C, then grind and pass through a 100-mesh sieve to screen the powder; press the screened powder into shape , the molding pressure is 200MPa, and the holding time is 3min, and the sintered green body is obtained. The biscuit is placed in a microwave sintering furnace for microwave sinterin...

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Abstract

The invention discloses a composite ceramic tool with the toughness reinforced by graphene nanosheets and a microwave preparation technology of the composite ceramic tool, and belongs to the technical field of machining tool manufacturing. The ceramic tool is prepared from, by mass, 50.2-60.2% of Al2O3, 20-40% of TiC, 3-5% of Ni, 3-5% of Mo, 0.5-1% of MgO, 0.5-1% of Y2O3 and 0.1-0.8% of graphene nanosheets with Al2O3 as the base body and TiC and graphene nanosheets as the reinforcing phases by adding a certain amount of metal adhesives and sintering aids. The composite ceramic tool is prepared through the microwave sintering technology with a microwave medium as the heat source under the protection of argon atmosphere through the optimum mixture ratio, the sintering temperature, the heat preservation time and other technological parameters. The graphene nanosheets in the prepared composite ceramic tool are uniformly distributed, the fracture toughness property of the tool is greatly improved, the highest hardness is 19.12 GPa, the fracture toughness property is 8.73 MPa m<1 / 2>, and the composite ceramic tool is good in comprehensive mechanical property and simple in preparation technology.

Description

technical field [0001] The invention relates to a composite ceramic cutter toughened by graphene nanosheets and a microwave preparation method thereof, belonging to the technical field of machining cutter manufacturing. Background technique [0002] Compared with traditional cemented carbide and high-speed steel cutting tools, ceramic cutting tools have the advantages of high hardness, high temperature resistance, oxidation resistance, strong corrosion resistance, good chemical stability, high wear resistance, and not easy to bond metals. The field of high-speed cutting has great application potential. However, the low strength and fracture toughness of ceramic tools can easily cause tool failure and fracture when cutting is difficult, which limits the application of the tool. Therefore, improving the brittleness of ceramic knives has become a key issue in the development of ceramic knives. [0003] At present, the main toughening methods for ceramic tools include phase tr...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/10C04B35/622C04B35/64C04B35/634
CPCC04B35/80C04B35/10C04B35/622C04B35/63416C04B35/64C04B2235/3206C04B2235/3225C04B2235/3843C04B2235/404C04B2235/405C04B2235/425C04B2235/5454C04B2235/667C04B2235/96
Inventor 程寓张勇付乾辰
Owner NANJING UNIV OF SCI & TECH
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