Tribological behavior of the PDA/PTFE + Cu-SiO2 nanoparticle thin coatings

SURFACE & COATINGS TECHNOLOGY

卷:409

Article

Soltani-Kordshuli, Firuze^1,2  Okyere, Deborah^2,4  Chen, Jingyi^2,3  Miller, Charles^1,2  Harris, Nathaniel^1,2  Afshar-Mohajer, Mahyar^1,2  Ghosh, Sujan K.^1,2  Zou, Min^1,2 

[1] Univ Arkansas, Dept Mech Engn, Fayetteville, AR 72701 USA

[2] Univ Arkansas, Ctr Adv Surface Engn, Fayetteville, AR 72701 USA

[3] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA

[4] Univ Arkansas, Mat Sci & Engn Program, Fayetteville, AR 72701 USA

关键词: Polytetrafluoroethylene (PTFE);    Polydopamine (PDA);    Cu-SiO2 nanoparticles;    Morphology;    Wear resistance;   

DOI  :  10.1016/j.surfcoat.2021.126852

来源: Elsevier

【 摘 要 】

Cu-SiO2 core-shell nanoparticles (NPs) were added to the polytetrafluoroethylene (PTFE) top layer of polydopamine (PDA)/PTFE thin coatings to improve the durability of the coatings. Three very low weight percentages of Cu-SiO2 NPs (0.005 wt%, 0.0075 wt%, 0.01 wt%) were added to a PTFE dispersion, which was then used to dipcoat the PTFE + Cu-SiO2 NPs onto PDA-coated stainless steel substrates to form PDA/PTFE + Cu-SiO2 NP thin coatings. The resulting thin coatings were less porous and had smaller surface roughness compared to PDA/PTFE thin coatings, revealing the effect of Cu-SiO2 NPs in making more compact thin coatings with interconnected PTFE fibrils. The compaction of the coatings led to improved adhesion and durability of the PDA/PTFE + Cu-SiO2 NP thin coatings.

【 授权许可】

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