Element 47 in our International Year of the Periodic Table series is silver. Silver compounds are key for film photography, and this element also pops up in your clothing: conductive gloves and some antibacterial socks contain it. For those of us old enough to remember the days when phones with physical keys dominated, touch-screen phones …
Month: July 2019
Element 46 in our International Year of the Periodic Table series is palladium. Another element that finds uses in the catalytic converters in our cars, palladium can also be used for hydrogen fuel storage and, more rarely, for making flutes. Like the previous element in our series, rhodium, palladium is used in the catalytic converters …
Super duplex stainless steel (SDSS) has excellent mechanical properties and corrosion resistance. However, currently, there are few researches conducted on its fretting wear performance. This paper studies the influence of different heat treatment temperatures and medium environment on the fretting wear performance of SAF 2507 SDSS. Results show that the combined effect of the sigma …
Effects of shaft shape errors are studied on dynamic characteristics of a rotor-bearing system. Stability characteristics of the cylindrical journal bearing are studied. It is shown that the rotating speed at which the oil whip occurs increases when the shape errors exit. And, there is a threshold speed of the bearing with shaft shape errors; …
Three types of surfaces in the Schroeder–Webster (SW) theory, i.e., sliding, mixed, and sticking surfaces, have been verified via finite element analysis of an axisymmetric compression test for a metallic specimen. Judging from (i) the radial profile of the pressure at the top elements and (ii) the radial displacement at the top nodes, the three …
Hydrophobic and self-cleaning photocatalytic ceramics and concrete with potential for the superhydrophobicity are promising novel materials for civil engineering applications including buildings, bridges, road pavements, and airport runways. Due to embedded liquid-repellent properties, such materials have low water and salt absorption and, therefore, enhanced durability. However, in applications requiring high traction (e.g., tire and pavement), …
Element 45 in our International Year of the Periodic Table series is rhodium. This rare, unreactive element finds uses in the catalytic converters in our cars and in electroplated white gold jewellery. Rhodium is one of a number of transition metals used in the catalytic converters found in diesel and petrol cars. These converters help …
A nonlinear dynamic model is proposed to investigate the dynamic interactions between the rolling element and cage under rotational speed fluctuation conditions. Discontinuous Hertz contact between the rolling element and the cage and lubrication and interactions between rolling elements and raceways are considered. The dynamic model is verified by comparing simulation result with the published …
In this study, tribological characteristics of diethylene glycol dimethyl ether (DGM)/diethylene glycol dimethyl ether–diesel blend A (10 vol% DGM + 90 vol% diesel)/diesel were compared after being subjected to quill roller-ball friction and four-ball friction tests. The lubricity and antiwear property of blend A were worse than those of diesel, albeit considerably better than those …
Element 44 in our International Year of the Periodic Table series is ruthenium. This element finds uses in electronics, fountain pens, and in some fingerprinting techniques. Ruthenium is added to alloys of platinum and palladium used in electrical contacts. These are used as switches in a wide array of electronic devices. ‘Iridium’ fountain pen nibs …
