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Tribological behaviour of Al/Saffil/C hybrid composites with various amounts of graphite and alumina fibres, produced by the squeeze casting method, was studied. Preforms with about 6.5–15.0% (all the percentages v/v) of Al 2 O 3 fibres (Saffil) and 1.5–12.0% of graphite were infiltrated under the pressure of 75MPa. The effects of the applied load, form of graphite, and the reinforcement...
A number of laboratory studies have indicated that Ni 3 Al-based alloys have significant potential in wear-critical applications, especially in sliding wear in a temperature range between 400 and 650°C. In this study, the wear behavior of an iron-alloyed Ni 3 Al with composition of Ni–18.8Al–10.7Fe–0.5Mn–0.5Ti–0.2B in atomic percentage and its composites reinforced by 6vol.% Cr ...
The friction properties of a range of boundary lubricating additives in diamond-like carbon (DLC)–DLC rolling–sliding contact have been investigated. Two types of commercial DLC have been studied, one hydrogenated diamond-like and the other Cr-doped, non-hydrogenated and graphitic.The graphitic-type DLC coating initially gave very low boundary friction with additive-free base oil but after a few minutes...
This study evaluated the wear of ASTM 4032 H steel (0.30C, 0.30Cu, 0.70Mn, 0.1Cr, 0.25Mo, 0.22Si, 0.02P, 0.05S in wt.%) during sliding against a titanium carbide metal matrix composite which consisted of round TiC micro-grains dispersed in a steel matrix. A Latin square design was applied to determine the dominant factor in the wear. The ANOVA results showed that the load was a significant factor...
The tribological performance of a hydrogenated amorphous carbon coating on Ti–6Al–4V against ceramic balls was checked by simple reciprocating sliding tests and by more complicated tests in a hip joint simulator. 3 of 4 joints failed during hip simulator testing already after approximately 100×10 3 cycles and possibly due to coating failures caused by insufficient polishing of the metallic...
During high-speed end milling of aeronautical-grade aluminum alloy 7475-T7351 parts using tungsten carbide with cobalt binding (WC–Co) tools, unexpected chipping followed by catastrophic failure of the end mills was observed, while abrasive wear traces were absent. The tool breakage occurs usually with no warning and involves large portions of the tool tip. Broken tools presented extensive damage...
ZrO 2 -based composites with 40vol.% TiC 0.5 N 0.5 addition were processed from both nanocrystalline and micrometer sized TiC 0.5 N 0.5 starting powders by hot pressing. Flat samples were manufactured and finished by wire electrical discharge machining (EDM) in order to investigate their sliding-wear behavior against a WC-Co cemented carbide. Reciprocative sliding...
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