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Scientists study hydrophobic coatings with PTFE

International. In a recently published study, Chinese scientists investigated the hydrophobic and wear-resistant properties of PTFE/CF composite coatings, to correct the phenomenon of embolization in bits.

This phenomenon usually occurs in the process of oil exploitation using a polycrystalline diamond bit (PDC). By using carbon fiber (CF) reinforced polytetrafluoroethylene (PTFE) composite coatings applied to PDC bits, friction and wear properties and hydrophobicity would improve.

In the aforementioned study, a particular process was used to prepare COATINGS composed of PTFE/CF with different CF contents. The mass fractions of CF in PTFE are 10%, 15% and 20%, respectively. The results showed that when the mass fraction of CF is 20%, the coefficient of friction is 0.17 ± 0.01, which does not represent a significant increase, while the wear rate is 2.74 × 10−4 mm3 / Nm, which is the lowest of all and is reduced by about 29.7%, compared to that of pure PTFE. 

In turn, the WCA composite coating of PTFE /20% CF increases to 122.0° ± 2.0°, which shows good hydrophobicity, while the WCA of pure PTFE coating is only 106.3° ± 1.5°. Abrasive wear and adhesive wear are the main wear mechanism of composite coatings under air exposure conditions.

- Publicidad -

The surface morphology of the coatings was observed by scanning electron microscope (SEM) and 3D measuring laser microscope, and water contact angles (WCA) were measured.

Source: European Coatings.

Ana María Mejía Angel
Author: Ana María Mejía Angel
Editora
Comunicadora social periodista con 10 años de experiencia en medios impresos y digitales para América Latina en inglés y español. Actualmente Editora de Informes Especiales, incluyendo el TOP 1OO de Integradores Latinoamericanos Industria AV.

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