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[en] In pursuit of energy efficiency and durability throughout human history, advances in lubricants have always played important roles. Ionic liquids (ILs) are room-temperature molten salts that possess unique physicochemical properties and have shown great potential in many applications with lubrication as one of the latest. While earlier work (2001–2011) primarily explored the feasibility of using ILs as neat or base lubricants, using ILs as lubricant additives has become the new focal research topic since the breakthrough in ILs’ miscibility in nonpolar hydrocarbon oils in early 2012. This work reviews the recent advances in developing ILs as additives for lubrication with an attempt to correlate among the cationic and anionic structures, oil-solubility, and other relevant physicochemical properties, and lubricating behavior. Effects of the concentration of ILs in lubricants and the compatibility between ILs and other additives in the lubricant formulation on the tribological performance are described followed by a discussion of wear protection mechanism based on tribofilm characterization. As a result, future research directions are suggested at the end.
[en] This documentation contains 5890 titles. It comprises the following topics: 1) Subdivision of subjects (German, English, French); 2) systematic bibliography of titles; 3) personal and corporate author indexes; 4) report and paper number index; 5) standard number index; 6) conference index by conference place; 7) subject index. (orig./HP)
[de]Diese Dokumentation enthaelt 5890 Titel. Sie gliedert sich in 1) Sachgebietseinteilung (deutsch, englisch, franzoesisch); 2) systematische Titelbibliographie; 3) Register persoenlicher und korporativer Autoren; 4) Report- und Paper-Nummern-Register; 5) Normenregister; 6) Konferenz-Register nach dem Tagungsort; 7) Sachregister in Englisch. (orig./HP)
[en] The main objective of this work was to design a novel device for compaction of metal powders so that the green parts could be ejected with applying a negligible force and without the need for any lubricant in either an admixed form or applied to the die wall. For this purpose a 40 mm diameter one-piece die was envisaged which would elastically contracted 0.076 mm before compaction and after completion of powder compacting operation, it would be allowed to expand, thus releasing the green compact and so it could be ejected with a force near to weight of the compacts. The experiment indicated that this shrinkage value of 0.076 mm was indeed a realistic estimate which provided sufficient shrinkage to cover both:I– The "elastic die deformation of 40 mm diameter during compaction" which shows 0.0433mm elastic deformation. II–The "elastic spring back of the specimen of 40 mm diameter" which was 0.0227 mm after completion of compaction and releasing the compaction force.Also provided sufficient clearance of 0.010mm between the compact and the die wall on release of compacting pressure to allow ejection of compact with a force near to weight of compact while no lubricant was used on the die wall nor admixed with powder.
[en] The present research work has focused to study the influence of base oil mixed with multi-wall carbon nanotubes (MWCNTs) nodular cast iron contacts with the steel to examine the tribological performance. The wear studies were carried out using a pin-on-disc tribometer. In this study, the percentage of oil concentration, the applied load carrying capacity, and the stability of lubrication film were investigated by varying two sets of sliding conditions. It was observed that the tribological behavior (friction, lubrication, and wear) was improved when the base oil mixed with MWCNTs when compared to the base oil alone. Further, the incorporated MWCNTs with the base oil was enhanced the load carrying capacity and the lubricating oil stability. The mechanisms behind the improvements of lubricating oil with MWCNTs on the nodular cast iron were also studied, investigated, and reported. (paper)