Method for preparing SiO2 nanosphere/PEFE (polytetrafluoroethylene) composite material
A composite material and nanosphere technology, applied in the field of nanotribology, can solve the problems of difficulty in exerting the small size effect of nanoparticles, nanoparticle dispersion, serious agglomeration, etc., and achieve high sphericity, uniform dispersion, and improved tribological properties. Effect
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Embodiment 1
[0032] Mix 2.4mL tetraethyl orthosilicate and 300mL ethanol, weigh 0.0065g potassium perfluorooctane sulfonate, add it into the tetraethyl orthosilicate mixture, and stir at 40°C for 5min. Add 130g of PTFE into it, stir at 40°C for 5min to obtain PTFE paste. Add 19.5mL of ammonia solution with a concentration of 6.5% dropwise to the PTFE paste, the dropping time is controlled within 1h, and the reaction is continued with stirring for 4h after dropping. After the reaction was complete for 5 hours, the solvent was removed from the mixture by a rotary evaporator at 40° C. and a vacuum of 0.099 MPa, and then the solid phase was dried at 100° C. to obtain the powder of the composite material. Preheat the prepared powder at 300°C, hold the pressure at 15MPa for 10min to finalize the shape, and finally put the blank in a muffle furnace for sintering at 370°C for 1.5h, and cold press at room temperature for 20min at 15MPa to make a composite Material.
[0033] In the composite mater...
Embodiment 2
[0035] Mix 4.8mL tetraethyl orthosilicate and 300mL ethanol, weigh 0.0130g potassium perfluorooctane sulfonate, add it to the tetraethyl orthosilicate mixture, and stir at 30°C for 5min. Add 130g of PTFE into it, stir at 30°C for 5min to obtain PTFE paste. Add 23mL of ammonia solution with a concentration of 5.7% dropwise to the PTFE paste, the dropping time is controlled within 1h, and the reaction is continued for 4h after dropping. After the reaction was complete for 5 hours, the mixture was desolventized by a rotary evaporator at 50° C. and a vacuum of 0.099 MPa, and then the solid phase was dried at 100° C. to obtain a powder of the composite material. Preheat the prepared powder at 310°C, hold the pressure at 20MPa for 5min to finalize the shape, and finally put the blank into a muffle furnace for sintering at 375°C for 1h, and cold press at room temperature for 30min at 10MPa to make a composite material .
[0036] In the composite material analyzed, SiO 2 The qualit...
Embodiment 3
[0038] Mix 9.6mL tetraethyl orthosilicate and 300mL ethanol, weigh 0.0260g potassium perfluorooctane sulfonate and add it into the tetraethyl orthosilicate mixture, and stir at 40°C for 5min. Add 130g of PTFE into it, stir at 40°C for 5min to obtain PTFE paste. Add 31mL of ammonia solution with a concentration of 5.1% dropwise to the PTFE paste, the dropping time is controlled within 1h, and the reaction is continued with stirring for 4h after dropping. After the reaction was complete for 5 hours, the solvent was removed from the mixture by a rotary evaporator at 30° C. and a vacuum of 0.080 MPa, and then the solid phase was dried at 100° C. to obtain the powder of the composite material. Preheat the prepared powder at 290°C, hold the pressure at 10MPa for 15min to finalize the shape, and finally put the blank in a muffle furnace for sintering at 365°C for 2h, and cold press at room temperature 20MPa for 10min to make a composite material .
[0039] The composite material ma...
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