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Preparation method of graphene-reinforced silicon nitride-based ceramic

A silicon nitride-based, ceramic preparation technology, applied in the field of structural ceramic materials, can solve the problems of graphene damage, reinforcement and toughness, graphene agglomeration, etc., and achieve the effect of improving fracture toughness and good mechanical properties

Inactive Publication Date: 2020-06-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene is very prone to agglomeration, which affects the overall performance of ceramics. During high-temperature sintering, graphene may be damaged or even completely transformed into other substances, which cannot enhance the toughness.

Method used

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  • Preparation method of graphene-reinforced silicon nitride-based ceramic
  • Preparation method of graphene-reinforced silicon nitride-based ceramic
  • Preparation method of graphene-reinforced silicon nitride-based ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing graphene-reinforced silicon nitride-based ceramics includes the following steps:

[0034] Step S1, weighing silicon nitride, graphene, magnesium oxide and yttrium oxide, the mass percentages of which are: graphene: 10wt%, yttrium oxide and alumina 10wt%, silicon nitride: 80wt%, as the main raw materials; Weigh 100% of the graphene mass of PVP (polyvinylpyrrolidone), measure and add graphene, the graphene concentration can reach 1mg / ml NMP (N-methylpyrrolidone), as a dispersant and dispersion medium; yttrium oxide and Alumina is a sintering aid.

[0035] Step S2, pour the graphene and PVP weighed in step S1 into NMP to form a graphene dispersion, which is placed in a 60°C water bath environment for supergenerating dispersion and mechanically stirred for 120 minutes;

[0036] Step S3, pour the aluminum oxide, yttrium oxide and silicon nitride weighed in step S1 into the dispersion in step S2 to obtain a composite raw material dispersion, which is placed i...

Embodiment 2

[0045] A method for preparing graphene-reinforced silicon nitride-based ceramics includes the following steps:

[0046] Step S1, weighing silicon nitride, graphene, magnesium oxide and yttrium oxide, the mass percentages of which are: graphene: 0.5wt%, yttrium oxide and alumina 10wt%, silicon nitride: 89.5wt%, as the main raw materials ; Separately weigh PVP (polyvinylpyrrolidone) with 100% graphene mass, measure and add graphene to NMP (N-methylpyrrolidone) whose graphene concentration can reach 1.5mg / ml, as dispersant and dispersion medium;

[0047] Step S2: Pour the graphene and PVP weighed in step S1 into NMP to form a graphene dispersion, which is placed in a 70°C water bath environment for supergenerating dispersion and mechanically stirred for 120 minutes;

[0048] Step S3, pour the aluminum oxide, yttrium oxide and silicon nitride weighed in step S1 into the dispersion in step S2 to obtain a composite raw material dispersion, which is placed in a 60°C water bath environment f...

Embodiment 3

[0056] A method for preparing graphene-reinforced silicon nitride-based ceramics includes the following steps:

[0057] Step S1, weighing silicon nitride, graphene, magnesium oxide and yttrium oxide, the mass percentages of which are: graphene: 1wt%, yttrium oxide and alumina 10wt%, silicon nitride: 89wt%, as the main raw materials; Weigh 75% of the graphene mass of PVP (polyvinylpyrrolidone), measure and add graphene to NMP (N-methylpyrrolidone) whose graphene concentration can reach 2mg / ml, as a dispersant and dispersion medium;

[0058] Step S2, pour the graphene and PVP weighed in step S1 into NMP to form a graphene dispersion, which is placed in a water bath environment at 80°C for supergenerating dispersion and mechanically stirred for 60 minutes;

[0059] Step S3, pour the aluminum oxide, yttrium oxide and silicon nitride weighed in step S1 into the dispersion in step S2 to obtain a composite raw material dispersion, which is placed in a 60°C water bath environment for superge...

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Abstract

The invention discloses a preparation method of a graphene-reinforced silicon nitride-based ceramic. The preparation method adopts silicon nitride and graphene as raw materials and a mixture of aluminum oxide and yttrium oxide as a composite sintering aid. The preparation method sequentially comprises the steps of independent dispersion of raw materials, composite dispersion, ball milling, dryingand sieving, three-dimensional mixing and hot press sintering. The mechanical property of the silicon nitride ceramic material is enhanced, and the added graphene improves the friction property of theceramic, so that the silicon nitride can be used as a good wear-resistant and friction-resistant material by improving the mechanical properties.

Description

Technical field [0001] The invention belongs to the technical field of structural ceramic materials, and specifically relates to a method for preparing graphene-reinforced silicon nitride-based ceramics. Background technique [0002] With the development of science and technology, the traction of functional requirements makes people have higher and higher requirements for material properties, such as bearing balls and tools on machine tools. People hope to make them have both good mechanical and tribological properties at the same time. With these two properties, it is more difficult to achieve. Silicon nitride ceramics have high hardness, high melting point, corrosion resistance and self-lubricating ability, but its brittleness makes simple silicon nitride materials easy to fracture, which affects the application of silicon nitride ceramics. In order to enhance its fracture toughness, graphene can be added to the silicon nitride ceramic, so that when the silicon nitride ceramic...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/64C04B35/645C04B35/626C01B32/194
CPCC04B35/584C04B35/622C04B35/64C04B35/645C04B35/6261C01B32/194C04B2235/3217C04B2235/3225C04B2235/422
Inventor 陈威赵自强
Owner SHAANXI UNIV OF SCI & TECH
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