Method for preparing graphene toughened and strengthened composite-phase ceramic material

A technology of multiphase ceramics and graphene nanosheets is applied in the field of materials to achieve the effects of simple preparation method, strong practicability and easy promotion

Inactive Publication Date: 2018-08-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is no research on the use of graphene nanosheets to strengthen alumina-tungsten carbide titanium nanocomposite ceramic materials in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A graphene-strengthened multiphase ceramic material, comprising various parts of the following mass fractions: Al 2 o 3 (29.6%)+(W,Ti)C(69.4%)+MgO(0.5%)+Y 2 o 3 (0.5%). The weighed Al 2 o 3 , (W,Ti)C, MgO and Y 2 o3 Add in absolute ethanol in turn, stir while adding, ultrasonically disperse and stir for 1 hour to prepare a raw material suspension; pour the prepared suspension into a ball mill barrel, and mix the materials on a ball mill for 48 hours; vacuum dry at high temperature, Pass through a 150-mesh sieve to obtain a well-dispersed composite powder raw material. Put it into a high-strength graphite mold, and then use a high-temperature hot-press sintering furnace for hot-press sintering; heat it from room temperature to 1200 °C at a heating rate of 40 °C / min, and then heat it to 1200 °C at a heating rate of 50 °C / min When the temperature reaches 1700°C, the pressure is steadily increased to 32MPa; at 1700°C and the pressure is 30MPa, keep the temperature fo...

Embodiment 2

[0033] A graphene-strengthened multiphase ceramic material, comprising various parts of the following mass fractions: Al 2 O(29.6%)+(W,Ti)C(69.2%)+MgO(0.5%)+Y 2 o 3 (0.5%) + graphene nanosheets (0.2%). With polyvinylpyrrolidone (PVP) as dispersant, its consumption is 50% of graphene nanosheet quality, dispersant is added in dehydrated alcohol, stirs while adding; Next, graphene nanosheet is added the ethanol of polyvinylpyrrolidone In the solution, after stirring for 1 minute, ultrasonic dispersion was carried out for 2 hours to prepare a uniformly dispersed graphene suspension; the weighed Al 2 o 3 , (W,Ti)C, MgO and Y 2 o 3 Sequentially add to the above graphene suspension, stir while adding, ultrasonically disperse and stir for 1 hour to prepare the raw material suspension; pour the prepared suspension into the ball mill bucket, and mix the materials on the ball mill for 48 hours; Vacuum drying and passing through a 150-mesh sieve to obtain a well-dispersed composite ...

Embodiment 3

[0036] A graphene-strengthened multiphase ceramic material, comprising various parts of the following mass fractions: Al 2 O(29.5%)+(W,Ti)C(69.1%)+MgO(0.5%)+Y 2 o 3 (0.5%) + graphene nanosheets (0.4%). With polyvinylpyrrolidone (PVP) as dispersant, its consumption is 50% of graphene nanosheet quality, dispersant is added in dehydrated alcohol, stirs while adding; Next, graphene nanosheet is added the ethanol of polyvinylpyrrolidone In the solution, after stirring for 1 minute, ultrasonic dispersion was carried out for 2 hours to prepare a uniformly dispersed graphene suspension; the weighed Al 2 o 3 , (W,Ti)C, MgO and Y 2 o 3 Sequentially add to the above-mentioned graphene suspension, stir while adding, ultrasonically disperse and stir for one hour to prepare the raw material suspension; pour the prepared suspension into the ball mill bucket, and mix the materials on the ball mill for 48 hours; Vacuum drying and passing through a 150-mesh sieve to obtain a well-disperse...

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Abstract

The invention provides a method for preparing a graphene toughened and strengthened composite-phase ceramic material. The method comprises the following steps: putting a certain content of high-quality thin-layer graphene into Al2O3 and (W, Ti) C; by taking MgO and Y2O3 powder as sintering aids, performing ultrasonic dispersion, high-energy ball milling and hot-pressing sintering, thereby obtaining the Al2O3-based graphene toughened and strengthened composite-phase ceramic material. Due to adoption of graphene nanosheets, growth of Al2O3 and (W, Ti) C granules is effectively inhibited, meanwhile, multiple toughening mechanisms are introduced, functions of refining crystal granules and improving the density of the composite material can be achieved, and furthermore the bending resistance, the hardness, the breakage toughness and the wearing resistance of the ceramic composite material can be remarkably improved. Due to the graphene, a novel way is provided for toughening of a ceramic tool material. The method is simple in step, convenient to operate and good in practicability.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing a graphene-strengthened composite ceramic material. Background technique [0002] Tool materials play an indispensable role in high-speed cutting and advanced manufacturing technology, and ceramic tool materials are widely used due to their high hardness, wear resistance, high temperature resistance, and low affinity with workpiece materials to high-speed cutting of difficult-to-machine materials. However, its inherent brittleness limits its further widespread application. In order to improve the fracture toughness of ceramic composites, many studies have been carried out at home and abroad. Studies have shown that whiskers can improve the fracture toughness of ceramic materials (Becher, P.F., et al., Toughening Behavior in Whisker‐Reinforced Ceramic Matrix Composites. Journal of the American Ceramic Society, 1988.71(12): p.1050-1061). In addition, car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/56C04B35/622
CPCC04B35/5607C04B35/622C04B35/80C04B2235/3206C04B2235/3217C04B2235/3225C04B2235/3843C04B2235/3847C04B2235/425
Inventor 崔恩照赵军
Owner SHANDONG UNIV
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