4 documents found, page 1 of 1
Effect of Annealing Heat Treatment on the Composition, Morphology, Structure an...
Yaqub, Talha Bin; Al-Rjoub, Abbas; Khalid, Hafiza Ayesha; Yaqoob, Khurram; Fernandes, Filipe; Cavaleiro, AlbanoAlloyed-transition metal dichalcogenide (TMD) coatings have been under investigation as multi-environment lubricants for the past few decades. These coatings display very low coefficient of friction properties at elevated temperatures. Studies on the annealing of these low-friction coatings are missing in the literature. For the first time, in this study, the annealing of the W-S-N dry lubricant coatings was ca...
TEM study of the oxidation resistance and diffusion processes in a multilayered...
Bondarev, Andrey; Al-Rjoub, Abbas; Bin Yaqub, Talha; Polcar, Tomas; Fernandes, FilipeThis work investigates the structure evolution of a multilayered TiSiN/TiN(Ag) coating with heating, oxide scale growth, diffusion processes occurring during oxidation, and changes in the structure and chemical composition of the non-oxidized zone. The coatings have a multilayered structure with a bilayer periodic thickness of ~40 nm. The TiN(Ag) layer consists of fcc TiN and Ag crystalline phases, where Ag nan...
Vacuum Tribological Properties of W-S-N Coatings Synthesized by Direct Current ...
Yaqub, Talha Bin; Yaqoob, Khuram; Mukhtar, Amir; Fernandes, Filipe; Bondarev, Andrey; Ferreira, Fabio; Al-Rjoub, Abbas; Cavaleiro, AlbanoThis work deals with the investigation of the tribological performance of DC magnetron sputteredW-S-N coatings under vacuum atmosphere, as part of the exploration of multi-environment sliding properties of W-S-N solid lubricants. This study is part of the systematic testing of W-S-N solid lubricants in different environments, especially vacuum, which is often ignored. The trend is to test sliding properties in ...
Development of a statistical method to help evaluating the transparency/opacity...
Oliveira, C. I. da Silva; Martínez Martinez, Diego; Al-Rjoub, Abbas; Rebouta, L.; Menezes, Raquel; Cunha, L.In this paper, we present a statistical method that allows evaluating the degree of a transparency of a thin film. To do so, the color coordinates are measured on different substrates, and the standard deviation is evaluated. In case of low values, the color depends on the film and not on the substrate, and intrinsic colors are obtained. In contrast, transparent films lead to high values of standard deviation, ...