Papers by Keyword: Nanotribology

Abstract: The paper delves into various aspects of nanotechnology in mechanical engineering, including the fabrication of nanomaterials and advanced manufacturing techniques. Nanomanufacturing methods offer unprecedented precision and control, enhancing efficiency and performance across industries. From nanoscale manipulation to intricate structure fabrication, nanotechnology is transforming manufacturing processes profoundly. Furthermore, the paper explores the applications of nanotechnology in nano mechanics and nanotribology, elucidating how it enables us to understand and manipulate mechanical behaviours at the nanoscale. Additionally, it discusses the role of nanotechnology in energy systems, where nanomaterials contribute to improved energy storage and conversion efficiency. Beyond traditional mechanical engineering, nanotechnology finds applications in biomechanics, shaping advancements in healthcare through innovative biomedical devices and materials. The interdisciplinary nature of nanotechnology is evident in its potential to address global challenges, such as environmental remediation, by developing nanomaterials for water purification, air filtration, and soil remediation. Looking ahead, the paper discusses future directions for nanotechnology in mechanical engineering, emphasizing the importance of interdisciplinary collaboration, ethical considerations, and responsible governance. It highlights the potential for transformative breakthroughs in medicine, energy systems, and materials science, guided by ongoing research and innovation. In conclusion, nanotechnology is poised to reshape the landscape of mechanical engineering, offering unprecedented possibilities for efficiency, sustainability, and technological advancement. Through careful exploration and application, nanotechnology holds the promise of addressing societal needs while pushing the boundaries of what is possible in mechanical engineering.

Abstract: Linear and nonlinear components relation in integral index of friction (D) for tribosystem dependence on hydrophilic properties of metal fillers (M=Cu, Al, Ni) has been considered. Metal fillers (M=Cu, Al, Ni) have been modified in surface layer with quaternary ammonium compounds. It was found that systems with Cu-based fillers had sufficiently high and stable linear component. The best antifriction properties of tribosystem correspond to metal filler with maximum nonlinear component in D = f(a) dependence, where a is adsorption of water.

Abstract: In the past 20 years, with the rapid development of nanotechnology and increasing people's social needs, tribology gained the rapid development. Meanwhile, many new areas produced. This article describes a simple spherical roller bearing down tribology design. Thus the development of tribology and trends are explained.

Abstract: Aiming to improve the nanotribological response of Si-based materials we implanted silicon wafers with different fluences of iron ions (up to 2x10¹⁷ cm^-2). Implantation was followed by annealing treatments at temperatures from 550°C to 1000°C. The implanted surfaces were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and wettability tests. Then, samples were submitted to AFM-based nanowear tests. We observe an increase of both hidrophobicity and and wear resistance of the implanted silicon, indicating that ion implantation of Si can be a route to be deeper explored in what concerns tribomechanical improvement of Si.

Abstract: Oleic acid capped copper nanoparticles were prepared by the solventless thermolysis of single-source precursor, cupric oleate. OA-capped Cu nanoparticles were characterized by means of FT-IR, TEM, XRD and TGA. Results show that OA-capped Cu nanoparticles with an average diameter of about 40 nm, which are able to prevent water adsorption, oxidation and are capable of being dispersed stably in organic solvents or mineral oil. This approach offers a great deal of facilitating their production without the need of protection by inert gases or sealed containers. In this process, only the preparation condition temperature has an obvious effect on the size and component of the product. OA-capped Cu nanoparticles as an additive in PAO10 perform good anti-wear and friction-reduction properties. As the additive concentration reach to 0.5 wt. %, the wear scar diameter can be reduced by 18 % and the friction coefficient can be reduced by 13 % as compared to pure PAO10.

Abstract: The abrasive wear and the wear resistance of composite nickel + SiC coatings are investigated. The coatings are deposited by the method for electroless nickel plating EFTTOM-NICKEL developed in TU-Sofia. Nanosized particles of SiC are used as a strengthened material. The size of the particles is 35-40 [nm]. The thickness of the coatings is 50 [µm]. The investigation of the coatings deposited on the different roughness surfaces is performed. Some of the samples are thermal processed at 300°C, 6 hours after deposition process. The methods for wear resistance testing is developed and the experimental results for the dependence of the massive wear, wear speed, intensity of wear and wear resistance on the friction road and the time of a contact interaction are obtained.

Abstract: This paper deals with the description of a method for the measurement of the nanotribology properties and microscopic interfacial frictional behavior with Atomic Force Microscopy (AFM). AFM force-displacement curve is utilized to determine the nanotribology properties. The interfacial coefficient of frictional force can be derived from a serial of calculations. A well-defined contact area is measured to study the frictional force and friction stress. The roughness of contact surface influences the contact between friction and surface forces. The study of roughness parameters corresponds to evaluate the friction and the interfacial strengths. Local variation in micro/nano tribology is also measured. The measured surface topography (3D profiles) are then applied to determinate the potential energy in molecular dynamic (MD) method to study the atomic scale frictional interactions.

Abstract: Fracture surface and surface of two kind of membrane of antibacterial bone china, which includes 3% and 5% of weight of composite phosphate containing rare earth respectively, were characterized by SEM and nanoindenter, respectively. Nanohardness and nanoscale friction coefficients were measured by nanoindenter. Friction coefficients were conducted at the maximal load being 300un,500un,1000un and scratching speed 15um/s, 0.75um/s, 0.5um/s, respectively. The nanohardness and friction coefficients of ceramic membrane including 3% and 5% of rare earths are 2.03GPa,0.18282 and 8.54GPa,0.051998, respectively. The two kind of ceramic membrane has stable nanotribology property. Obvious plastic flow and pile-up scratch impression of ceramic membrane including 3% rare earths is observed by AFM in situ imaging, but scratch impression of 5% has no plastic flow and take on the sink-in topography. Nanohardness and friction coefficients of this two kind of ceramic membrane have strong relationships each other but weak relations with elastic modulus.

Abstract: A novel measurement system, the multi-functional Tribological Probe Microscope (TPM), has been developed to provide multi-function measurements of surface and surface properties. These properties are topography, friction, Young’s modulus, and nano-hardness. They are measured, point-by-point, in a single scan set up. The four function maps of surface topography, friction, hardness and Young’s modulus are correlated in space and time. In this paper we will brief the TPM system and demonstrate the capability of the multi-function evaluation of engineering surfaces and their correlated nature between these functions. It is believed that such direct correlated measurements will help scientist and engineers to understand surface and surface related properties and eventually to design and optimise a surface for a better performance.