The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Using an atomic force microscope, the friction-induced hillocks of 0.5–7.1nm in height were observed on Si(100) surface under both atmosphere and vacuum conditions. Larger hillocks can be produced by either higher loads or more scratch cycles. Detailed surface analyses on the hillocks revealed that the thickness of oxidation layer formed during scratching was 1.2nm in vacuum and 1.5nm in atmosphere,...
On the basis of Y-TZP/Al 2 O 3 nanoceramics, the additive of metal molybdenum was developed to generate Y-TZP/Al 2 O 3 /Mo nanocomposites, which are compounded by nano-sized ZrO 2 –Y 2 O 3 –Al 2 O 3 and micro-sized molybdenum powder as raw material. The objective of this paper was to understand the friction and wear behavior of...
An electrical contact interface is visualized by rendering “contact maps” from X-ray Computer Tomography (CT) images without the need for dismantling the specimens. The contact maps consist of approximately 1500pixels×1500pixels with each pixel relating to an 8.0μm×8.0μm×8.0μm volume at the interface. The specimens consist of bolting a cable lug to a printed circuit board. The resolution dependence...
Wear of etched near-eutectic aluminium–silicon alloy slid against a steel ball under ambient is explored. The sliding velocity is kept low (0.01m/s) and the nominal contact pressure is varied in a 15–40MPa range. Four stages of wear are identified; ultra mild wear, mild wear, severe wear and post severe oxidative wear. The first transition is controlled by the protrusions of silicon particles, projecting...
The effect of contact load and volume of lubricant in the time to tribofilm breakdown and extent of wear was examined in fully formulated oil with zinc dialkyl dithiophosphate as the main anti-wear additive. The mechanism of tribofilm formation and breakdown was followed carefully by monitoring the friction coefficient over the duration of the test. Tribological tests conducted with limited lubricant...
The improvement of high-performance anti-wear diamond-like carbon-coatings (DLC-coatings) for industrial applications is usually supported by using an oscillating sliding model test. A ball-on-disc setup allows the simulation of accelerated conditions in an unlubricated contact at increased contact pressure. Although the wear behaviour of DLC-coatings has been frequently investigated in literature,...
The objective of this work was to determine the mechanisms of tribofilm formation during the gross slip fretting wear of Ti6Al4V and a thick nickel oxide film. This was accomplished by conducting bench level fretting wear experiments on Ti6Al4V surfaces mated with ∼75μm thick nickel oxide scale. The nickel oxide scale was grown by oxidizing commercially pure nickel at 1000°C. The fretting wear experiments...
Aluminum-base hybrid composites reinforced with mixtures of SiC and Al 2 O 3 particles 1.25μm in average size have been fabricated on an A 1050-H24 aluminum plate by friction stir processing (FSP) and their wear resistance has been investigated as a function of relative weight ratios of the particles. A mixture of SiC and Al 2 O 3 powders of different weight ratios...
To predict the thickness of a self-lubricating layer on the contact surface of ceramic composite material containing a soft phase during dry sliding test, a mechanical model was built to calculate the material transfer of the soft second phase in the composite to the surface. The tribological test, as a case, the contact situation of a composite disk sliding against a loaded pin was studied in the...
Sports activities may cause different types of injuries induced by friction between the skin and sport textiles. Focusing on runners who are often bothered with blisters, we studied the textile–foot skin interface in order to measure and predict friction. We first determined the characteristics of mechanical contacts between foot, sock and shoe during running. On this basis, we developed a reciprocating...
The scratch behaviour of an amorphous polymer was investigated to determine how the characteristics of the material affect the scratch resistance. A thermoplastic polymer (polymethylmethacrylate) was studied using both an experimental device allowing in situ observation of the contact area during scratching with spherical tips and a numerical approach using finite element modelling (FEM). The rheological...
Development and validation of improved erosion models demands accurate, high resolution measurement techniques to quantify the distribution of erosion over large-scale and/or complex geometries. However, current sophisticated geometric scanning equipment is mostly used to examine small-scale erosion scars, and such techniques are not applicable when researching the erosion of complex or large-scale...
Application of MoS 2 -based solid lubricant has extreme potential as a coating material of cutting tools because of its superlubricity against most of the engineering materials. However, a detailed study on the effect of such lubricious coating in grinding has never been carried out before. In the present research, the tribological behaviour of MoS 2 -Ti composite coating with TiN...
WC/Co hardmetals are widely used in tool applications where resistance to abrasive wear is important. In corrosive environments the loss of material is amplified due to synergistic effects.This paper reports the results of model experiments using a micro-tribology test system and diamond indenters to examine the details of microstructural mechanisms of wear and damage that take place in abrasion of...
This work focuses on the performance of some carbide composites, in particular alloys designed for metalforming in wear conditions with prevalence of adhesion. Wear tests were performed by a special metal cutting method which consisted of turning of mild steel at low speed. The results were compared with those obtained in the sliding wear tests and related to the mechanical properties and microstructure...
An analysis method has been proposed to estimate the wear rates of fibers from the results of wear tests carried out by contacting the fiber with a rotating drum covered with abrasive paper. With this method, the influences of heat treatment, drawing and addition of aluminum borate whiskers and carbon nanotubes with cup-stuck structure on the wear resistance of polyamide 6 and poly(ethylene terephthalate)...
The effects of grain size and hardness of wrought Alloy 718 on the wear of cemented carbide tools were examined by measuring the actual progression of wear in a specific transverse turning operation. Four different conditions of the same material from the same batch were studied—fine grain material in the soft, solution annealed state and in the precipitation hardened state, and large grain material...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.