▎ 摘　　要

NOVELTY - Preparing corrosion-resistant light piston comprises (i) taking 40-90 wt.% polyether-ether-ketone powder, 5-45 wt.% inorganic short fiber and 0.1-5 wt.% carbon nanoparticles, (ii) soaking the short fiber in the mixed acid, stirring and reacting for more than 60 minutes, then cooling and allowing to stand, centrifuging, using distilled water to wash the precipitate, adjusting pH to 7, and drying, (iii) dissolving m-chloropoxybenzoic acid in the chloroform solvent, and forming, (iv) soaking in the solution for chloroforming treatment, (v) dispersing the short fibers after surface ring oxidation treatment in the high-speed dispersion machine, spraying the polyethylene imine solution (vi) material kneading, (vii) hot pressing of piston, (viii) heat treatment of the piston blanks, and (ix) machining the piston blank. USE - The method is useful for preparing corrosion-resistant light piston for fuel cabin used in underwater turbine engine propulsion system of underwater vehicle. ADVANTAGE - The method provides the light piston which is not easy to crack and has high yield. The obtained polymer complex material piston can greatly reduce the self weight of the fuel supply cabin, it has good corrosion resistance, it is especially suitable for perchloric acid hydroxylamine and mixed fuel, the sealing reliability in the process of fuel extrusion obviously improved, and the piston structure strength and operation reliability under the condition of low pressure difference satisfy. DETAILED DESCRIPTION - Preparing corrosion-resistant lightweight piston for a fuel tank, comprises (i) taking 40-90 wt.% polyetheretherketone powder, 5-45 wt.% inorganic short fibers and 0.1-5 wt.% carbon nanoparticles, (ii) soaking the inorganic short fibers in mixed acid at 50-80℃, stirring and reacting for more than 60 minutes, cooling and allowing to stand for centrifugation, using distilled water to clean the precipitate, and adjusting the pH to be 7, drying at 100℃, (iii) dissolving m-chloroperoxybenzoic acid in chloroform solvent to form a chloroform solution with a concentration of 15-30%, soaking the surface-oxidized inorganic short fibers in chloroform solution for more than 4 hours, stirring the material, allowing to stand, centrifugal filtration, and drying, (iv) dispersion of carbon nanoparticles by adding carbon nanoparticles to polyethyleneimine (PEI) aqueous solution with a mass concentration of more than 60%, and ultrasonic dispersion to obtain polyethyleneimine containing carbon nanoparticles with a mass concentration of 2~5% aqueous solution, (v) dispersing the surface epoxidized short fibers at a high speed in a high-speed stirring and dispersing machine, spraying the polyethyleneimine solution containing carbon nanoparticles into the stirring and dispersing machine, and stirring and dispersing until the fiber bundles are completely dispersed, taking out the material, drying the material to obtain the dried material, (vi) using a vacuum kneader to knead the polyetheretherketone powder at 150±10℃ until the surface appears sticky, adding the dried materials in batches in proportion, increasing the kneading speed to 200-500 RPM, and turn on the vacuum, raising the temperature to 200-240℃, continue to mix for 1 hour, taking out the mixed material in a hot state, and pulverizing after the mixed material is completely cooled to obtain a pulverized mixed material, (vii) taking out the pulverized mixed material and then hot pressing in the mold, cooling down after molding, releasing the pressure when the temperature is lower than 150℃, cooling down to room temperature with the furnace, and taking out after demolding Piston blanks, (viii) heat treatment of the piston blanks, and (ix) machining the piston blank.