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Microstructure analysis of internally oxidized Cu-C composite
Rebeka Rudolf, Ladislav Kosec, Alojz Križman, Ivan Anžel, 2006, original scientific article

Abstract: On the basis of experimentally obtained data, it was established that submicron-size bubbles are formed by the internal oxidation of Cu-C composite with fine dispersed graphite particles. They are homogeneously distributed in the Cu-matrix. This process starts with the dissolution of oxygen into the metal at the free surfaces, and continues with the diffusion of oxygen atoms into the volume of copper crystal lattice where they react with the graphite particles. The reactions of dissolved oxygen with carbon yield the gas products (CO2, CO), which cannot be dissolved in the crystal lattice of the matrix. The gas molecules, which are enclosed in the space previously occupied by the graphite, have a greater specific volume than the solid graphite. Consequently, compressive stresses arise in the copper matrix around the bubbles. The interaction of these stress fields with gliding dislocations during loading could improve the mechanical properties of the copper. The internal oxidation kinetic in Cu-C composite depends on the diffusion of oxygen in the copper matrix, and the penetration depth of the internal oxidation front indicates the parabolic nature of the process.
Keywords: metallurgy, Cu-C composites, internal oxidation, bubbles
Published: 03.07.2017; Views: 426; Downloads: 66
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Air-release and solid particles sedimentation process within a hydraulic reservoir
Vito Tič, Darko Lovrec, 2013, original scientific article

Abstract: Contaminant in a hydraulic fluid is broadly defined as any substance that impairs the proper functioning of a hydraulic system. Hydraulic fluid can be contaminated by air, particles, water, and foreign fluids. Fluid contamination can cause numerous problems including component damage, unacceptable noise, poor component response and severe fluid degradation. This paper focuses on two major contaminants that should be considered when designing a hydraulic reservoir - air and particle contamination. A proper reservoir design can prevent the occurrence of air and solid contaminants within the hydraulic system and reduce their negative effects. A hydraulic reservoir should be designed in such a way as to stabilize and direct the oil flow inside the reservoir, so that the fluid has enough time to release air bubbles and to deposit solid particles. In order to visualize and understand flow patterns inside the reservoir, all the advantages of using simulation techniques within the field of reservoir design will be shown. This paper investigates the trajectories of solid and gaseous particles within a hydraulic reservoir, which are based on simulated transient phenomena using the Ansys Workbench. The results obtained focus on the sedimentation of solid particles and the elimination of gaseous particles within a hydraulic reservoir.
Keywords: hydraulic reservoir, air bubbles, solid particles, simulation, trajectories
Published: 10.07.2015; Views: 602; Downloads: 87
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