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A kind of graphene modified composite material piston and its preparation method and application

A technology of graphene modification and composite materials, which is applied in the direction of pistons, mechanical equipment, engine components, etc., can solve the problems that pistons are easily mixed with impurity phases and pores, uneven composition and structure, and poor high temperature resistance, so as to reduce the Oil consumption and emission of harmful substances, improvement of thermal corrosion resistance, effect of low density

Active Publication Date: 2018-02-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pistons prepared by traditional casting and forging processes are easily mixed with impurity phases and pores, resulting in defects such as shrinkage, uneven composition and structure, and are heavy in weight and poor in high temperature resistance, making it difficult to meet the development needs of future internal combustion engines.

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  • A kind of graphene modified composite material piston and its preparation method and application
  • A kind of graphene modified composite material piston and its preparation method and application

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preparation example Construction

[0025]The invention provides a method for preparing a modified carbon-based composite material piston, which is characterized in that it comprises the following steps:

[0026] S1: Add the graphene powder into the ethanol-acetone mixed solution to disperse it evenly, and then ultrasonicate for 30-60 minutes; wherein, the mass ratio of the graphene powder to the ethanol-acetone mixed solution is 1:20-1:50, and the ethanol-acetone mixed solution The mass ratio of ethanol to acetone is 1:1~1:1.5.

[0027] S2: adding the liquid obtained in step S1 into the phenolic resin acetone solution, and mixing uniformly to obtain a graphene-modified phenolic resin solution, the mass ratio of graphene to phenolic resin being 0.1 to 0.5:60.

[0028] S3: Use the phenolic resin solution modified by graphene as the precursor solution, and use the precursor impregnation and cracking method to treat the piston preform, specifically, place the piston preform in the impregnation device, and vacuum un...

Embodiment 1

[0037] Add 3g of graphene powder into 105g of ethanol-acetone mixed solution, the mass ratio of ethanol and acetone in the ethanol-acetone mixed solution is 1:1, stir and disperse evenly, and then ultrasonic for 40min to completely separate the graphite sheets into a single-layer structure. Slowly add the graphene solution obtained dropwise into 1000 g of phenolic resin acetone solution containing 600 g of 2123 phenolic resin under stirring at room temperature, and keep stirring for 3 hours to mix evenly, so that the graphene is evenly dispersed in the phenolic resin acetone solution.

[0038] According to the structure and size of the piston, the model analysis and optimization design of the piston prefabricated body are carried out, and the piston prefabricated body is prepared by using polyacrylonitrile-based carbon fiber with a three-dimensional weaving process. 15Pa, the graphene-modified phenolic resin solution was added to the impregnation device, and at a temperature of...

Embodiment 2

[0042] Add 3g of graphene powder into 105g of ethanol-acetone mixed solution, the mass ratio of ethanol and acetone in the ethanol-acetone mixed solution is 1:1.2, stir and disperse evenly, and then ultrasonic for 30min to completely separate the graphite flakes into a single-layer structure. The obtained graphene solution was slowly added dropwise to 1000 g of phenolic resin acetone solution containing 600 g of 2123 phenolic resin under stirring at room temperature, and continued to stir for 5 hours to mix evenly, so that the graphene was evenly dispersed in the phenolic resin acetone solution.

[0043] According to the structure and size of the piston, the model analysis and optimization design of the piston prefabricated body are carried out, and the piston prefabricated body is prepared by using polyacrylonitrile-based carbon fiber with a three-dimensional weaving process. 15Pa, the graphene-modified phenolic resin solution was added to the impregnation device, and at a tem...

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Abstract

The invention relates to a graphene modified composite piston, a preparation method and application thereof. The preparation method includes: adding graphene powder into an ethanol-acetone mixed solution, dispersing the powder uniformly, and then conduct ultrasound treatment; adding the obtained solution into a phenolic resin acetone solution, and mixing the substances evenly; firstly using precursor infiltration pyrolysis method to prepare a modified interface layer on the surface of a piston preform; then further densifying the obtained piston perform having the graphene / C interface layer by precursor infiltration pyrolysis, and repeating precursor infiltration pyrolysis until the piston density reaches 1.73-1.78g / cm<3>; and then carrying out graphitization treatment at 2400-2600DEG C for 2-3h, thus obtaining the graphene modified composite piston. The modified carbon matrix composite piston provided by the invention can improve the hot corrosion resistance, room temperature and high temperature tensile strength of piston, decrease the thermal expansion coefficient, and reduce the fuel consumption and harmful substance emission of corresponding engine.

Description

technical field [0001] The invention relates to the technical field of piston material and piston design and processing, in particular to a graphene-modified composite material piston and its preparation method and application. Background technique [0002] Because the piston works under the conditions of high temperature, high pressure, corrosion, friction, thermal load, etc., it becomes one of the most critical components in the internal combustion engine, and its quality directly affects the usability, reliability and working life of the internal combustion engine. With the continuous development of internal combustion engines in the direction of high power, medium and high speed, and miniaturization in the future, the working environment of pistons will become more harsh, so higher requirements are put forward for the performance of piston materials. However, pistons prepared by traditional casting and forging processes are prone to be mixed with impurity phases and pore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/84F02F3/00C04B41/87
CPCC04B35/83C04B41/009C04B41/5035C04B41/5042C04B41/87C04B2235/425C04B2235/46C04B2235/48C04B2235/608C04B2235/96C04B2235/9607F02F3/0084F02F2200/00C04B41/4515C04B41/5031
Inventor 罗瑞盈龙文彪
Owner BEIHANG UNIV