Influence of a Diamond-Like Carbon-Coated Mechanical Part on the Operation of an Orbital Hydraulic Motor in Water

Abstract

The increasing focus on reducing the environmental impact of hydraulic applications has driven efforts to apply new surface-engineering technologies and replace classic lubricants with alternative solutions. In particular, water has gained increasing attention in recent years. However, water has very poor lubrication properties and, especially in combination with steel/steel contact, it leads to severe tribological behavior. A literature review and preliminary research showed that appropriate surface engineering regarding diamond-like carbon (DLC) coatings represents a promising solution to overcome the limitation of steel/steel contacts in water. Basic tribological ball-on-disc tests were performed. The result of the tribological investigation showed that there was very low friction and wear in the steel/DLC contact in water. This was our motivation for using DLC coating in a real hydraulic application. The DLC was deployed on the floating outer ring, so steel/DLC contacts between the floating outer ring and three other important parts were created. It was proven that the poor lubrication properties of the water were overcome with appropriate surface engineering. In such a case, the hydraulic motor operated satisfactorily when the water was applied as a working fluid.

Green Tribology for the Sustainable Engineering of the Future

“…28) allowed the motor to run, which was not the case with only the steel parts. Although an efficiency of only 23 % was achieved [120], the highly loaded orbital hydraulic motor was able to operate in water-lubricated conditions. In spite of much more work being required, this points the way toward green water-lubrication even in the most heavily loaded contacts in machinery used in natural environments.…”

“…Mechanical parts of hydraulic motor: a) original steel design and; b) modified design employing a DLC coating[120] …”

Analytics of Antimony in Natural Water of Nanoparticle Platinum Electrode by Application Square Wave Voltammetry

“…Such techniques however have some drawbacks, such as difficult operation, high maintenance costs, costly equipment that requires well regulated experimental conditions. In fact, heavy metal electrochemical identification on various electrical surfaces, including solid electrodes, was carried out (Laschi et al, 2006), microelectrodes (Strmčnik et al, 2019), Nafion-modified electrodes (Alkhawaldeh et al, 2020), and nanoelectrode (Hourani and Alkawaldeh, 2016).…”

Highly Sensitive Copper Heavy Metal Analysis on Nanoparticle Platinum and Palladium Electrode<strong> </strong>

“…A hanged mercury drop (HMDE) or a thin-film of mercury (MFE) was widely used as an electrode in a supply (glass fiber, fiber paste). The HME is a thick electrode with a significant volume of radioactive mercury (Strmčnik et al, 2019). Both the MFE decreases the volume of mercury and the size of the electrode, but also requires a large amount.…”