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The objective of this study is to investigate the influence of water on tribological braking behavior of brake shoe material using a sub-scale frictional braking machine. The results indicate that the friction coefficient of braking interface has a close relationship with the braking velocity and the pressure under the wet condition. The friction coefficient shows a reduction by 30% compared with...
The objective of this study is to investigate the braking tribological characteristics of two kinds of metro brake shoe materials using a sub-scale frictional braking machine. The results indicate that the friction coefficient of braking interface has a close relationship with the velocity and pressure. The increase of velocity and pressure raises the temperature-rise of braking interface. The increasing...
The uni-directional pin-on-disk wear tests were performed in elevated-temperature air at 400°C for the Cr–Mo–V cast steels with different compositions. Morphology, composition and structure of worn surfaces, oxidation films and matrix were examined using SEM, EDS, XRD and TEM. The relations between oxidation wear rate and matrix were studied. The mechanism of wear was clarified. Under elevated-temperature...
A new aluminum bronze material with aluminum content over the solubility limit and several trace elements, Cu–14Al–X alloy (X is trace elements), has been developed for drawing dies. The mechanical properties such as hardness, tensile strength and impact toughness were evaluated experimentally. The friction and wear behavior of the material was investigated under boundary lubrication conditions. The...
Wear particle generation in carbon nitride coatings by a spherical diamond counterpart in repeated sliding contacts has been studied with an emphasis on the effect of relative humidity varying from 0.4 to 80%.An environmental scanning electron microscope (E-SEM), in which a pin-on-disk type apparatus was installed, has in situ provided direct evidence that when and where the wear particle generation...
With a pin-on-disk type apparatus installed in the chamber of an environmental scanning electron microscope (E-SEM), the motivation of this paper is to show the validity of the in situ examination to study the generation of wear particles of non-conductive carbon nitride coatings on silicon substrates under controllable relative humidity.Two typical shapes of generated wear particles can be observed...
The frictional behavior of carbon nitride coatings on silicon substrates repeatedly sliding against a spherical diamond is presented. The motivation is to clarify the coating thickness effect on friction with relation to applied normal load and repeated friction cycles. Repeated friction tests on silicon substrates with sputtered carbon nitride coatings of various thickness were conducted using a...
The influences of both the nitrogen incorporation parameters and the coating thickness on the surface damage mode transitions in carbon nitride coatings have been initially studied from the view points of critical loads and critical groove depth. An environmental scanning electron microscope, in which a traditional pin-on-disk tribotester was installed, has dynamically provided direct evidence that...
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