▎ 摘　　要

NOVELTY - Preparation of modified carbon-based composite piston involves adding graphene powder to ethanol acetone mixed solution at mass ratio of (1:20)-(1:50); uniformly dispersing for 30-60 minutes to obtain graphene solution; adding graphene solution to phenol resin acetone solution at mass ratio of (0.1-0.5):60; uniformly mixing to obtain graphene-modified phenolic resin solution; impregnating piston preform in graphene modified phenolic resin solution via precursor impregnation pyrolysis; and repeating precursor impregnation pyrolysis until graphene/carbon interface layer thickness is 300-400 nm. USE - Preparation of modified carbon-based composite piston used for preparing internal combustion engine (claimed). ADVANTAGE - The method produces modified carbon-based composite piston with improved heat-corrosion resistance, has improved room temperature and high-temperature tensile strength, and has reduced thermal expansion coefficient. The composite piston produces combustion engine with reduced fuel consumption and harmful material emission. DETAILED DESCRIPTION - Preparation of modified carbon-based composite piston comprises adding graphene powder to ethanol acetone mixed solution at mass ratio of (1:20)-(1:50), in which volume ratio of ethanol to acetone is (1:1)-(1:1.5); uniformly dispersing for 30-60 minutes to obtain graphene solution; adding graphene solution to phenol resin acetone solution at mass ratio of (0.1-0.5):60; uniformly mixing to obtain graphene-modified phenolic resin solution; impregnating piston preform in graphene modified phenolic resin solution via precursor impregnation pyrolysis; repeating precursor impregnation pyrolysis until graphene/carbon interface layer thickness is 300-400 nm; densifying piston preform with graphene/carbon interface layer by pyrolysis using phenolic resin acetone solution as precursor solution; repeat densifying until piston density is 1.73-1.78 g/cm3 or repeat densifying until piston density is 1.1-1.2 g/cm3, and further densifying piston via chemical vapor infiltration until piston density is 1.73-1.78 g/cm3; and graphitizing densified piston at 2400-2600 degrees C for 2-3 hours to obtain modified carbon-based composite piston. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a process for preparing modified carbon-based composite piston (Drawing includes non-English language text).