Preliminary evaluations on development and material selection of high temperature vacuum casted marble dust-reinforced silicon-bronze alloy material for bearing applications

Development and selection of an adequate bearing material with distinct characteristics for wear resistant applications is one of the most crucial tasks. Inappropriate selection of material may cause hindrance and result in failure of components during its functioning. To this end, this research focusses on fabrication of bearing materials reinforced with varying weight percentages of industrial waste, i.e. marble dust, and the physical, mechanical and tribological characteristics were determined. The proportions of marble dust were varied from 0 wt. % to 10 wt. % with a gap of 2.5 wt. % and filled in a silicon-bronze alloy. The physical and mechanical properties were realized by the Archimedean principle, micro-hardness tester and Instron 3369 universal testing machine respectively. The tribological properties such as friction and wear behaviour were determined utilizing pin-on-disk tribometer under different condition at normal room temperature. Due to the conflicting nature of desired properties in a bearing material, the Vise Kriterijumska Optimizacija Kompromisno Resenjemeaning under fuzzy environment was applied to rank and select the optimal composite among available alternatives because it can obtain compromise solution considering overall satisfaction and regret of the selection of the wrong provinces. From the analysis of the results, it was found that silicon-bronze-3 marble dust bearing material containing 7.5 wt. % marble dust achieved the best possible set of the properties for wear resistant applications.

OLIN BRASS ALLOY C19010

Olin Brass Alloy C19010 is a silicon bronze precipitation hardened alloy with high strength and good electrical conductivity. This datasheet provides information on composition, physical properties, and tensile properties. Filing Code: Cu-885. Producer or source: Olin Brass.

Microstructure and corrosion characteristics of cast silicon bronze in ammonia environment

Refrigerating systems operating on either the open re-circulation or chilled water circuits are proned to corrosion attacks. Often, the ensued corrosion products foul and inhibit efficient heat transfer within the system causing leaks resulting in catastrophic failures. Thus, the imperative to search for a material that can be an effective substitute for the conventional copper pipe used in most refrigerating systems. In this study, the microstructure and corrosion susceptibility of cast silicon bronze in anhydrous ammonia environment was investigated. The silicon bronze was produced by sand casting with the silicon varied from 1-4 wt. %. An accelerated electrochemical polarisation technique was employed to simulate the corrosion behavior of the cast alloy. The results show relatively low corrosion susceptibility, 0.75 mm/yr of the alloy in anhydrous ammonia. This may be attributed to the silicon dioxide (SiO2) passive film formed on the surface of the alloy. The effectiveness of the SiO2 passive film increases as the wt. % of silicon addition increased. The potential for drastic reduction in maintenance cost and frequency of call-backs of refrigerating units is enhanced by the outcome of this study.Kathmandu University Journal of Science, Engineering and TechnologyVol. 13, No. 1, 2017, Page: 56-65