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Noise is a major issue while transferring images through all kinds of electronic communication. One of the most common noise in electronic communication

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Article:Alnaqi, AA, Kosarieh, S orcid.org/0000-0002-0210-7165, Barton, DC orcid.org/0000-0003-4986-5817 et al. (2 more AbstractAlumina coated lightweight brake rotors were investigated to evaluate the effect of coating properties on their friction performance and thermal durability. An alumina ceramic coating on AA6082 aluminium alloy (Al-Alloy) and on 6061/40SiC aluminium metal matrix composite (Al-MMC) prepared by plasma electrolytic oxidation (PEO) was studied using a programme of brake dynamometer and material characterisation tests. The results showed that the PEO alumina layer adhered well to the Al-alloy substrate and was more uniform and durable when compared to that on the Al-MMC. The PEO layer significantly improved the hardness of the rotor surface for both Al-alloy and Al-MMC substrate. The coated Al-alloy disc brake rotor was demonstrated to give good thermal and friction performance up to high rubbing surface temperatures of the order of 550 o C but the rotor eventually failed due to temperature build-up at a critical location.

In this study, mechanical and tribological properties of plasma electrolytic oxide (PEO) coatings prepared on Ti6Al4V and cp-Ti alloys in two different electrolytes have been investigated. Additionally, molybdenum disulfide friction modifier (FM) was impregnated onto the PEO coatings to evaluate the effect of solid lubrication and composite nature of the ceramic PEO coating on tribological behaviour. Surface morphology and cross-sections were examined by scanning electron microscopy. Phase composition was identified by X-ray diffraction. Nanoindentations were performed to determine the mechanical properties of the coatings. Adhesion strength of the coatings was determined using a scratch test. To assess the tribological behaviour of the coatings, dry sliding wear test against 100Cr6 steel ball was performed with a ball on flat configuration. Test results showed that the PEO coating produced in aluminate-phosphate electrolyte possessed less wear loss compared to that produced in silicate-phosphate electrolyte. Impregnation of the PEO coatings with FM resulted in reduced friction coefficient.