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Raman spectroscopy of solid lubricant coatings during high temperature (300–700°C) wear testing was employed for real-time correlation of sliding contact surface chemistry to the measured friction coefficient. Two coatings were investigated in this work – MoS 2 and VN-Ag. Immediately prior to failure of the MoS 2 coating at 350°C, molybdenum trioxide was detected in the wear track,...
Al 2 O 3 fiber (Al 2 O 3f ) and SiC particle (SiC p ) hybrid metal matrix composites (MMCs) were manufactured in a squeeze casting method and investigated for their mechanical and wear properties at elevated temperatures of 100°C and 150°C. The pin specimens had different ratios of fiber to particle content but their total weight fraction was constant at 20wt...
Ti(C,N)-based cermets have been attracting much attention because of their good high temperature strength, perfect chemical stability, excellent wear resistance, and relatively better machinability. In this paper, the tribological performance of Ti(C,N)/Si 3 N 4 sliding pairs lubricated in water was investigated using a ball-on-disk tribometer at sliding speed of 200mm/s. The normal...
A limitation has been identified in the existing test standards used for making controlled, two-body abrasion scratch measurements (ASTM Standard G 171) based solely on the width of the resultant score on the surface of the material. A new, more robust method is proposed to complement the current two-body scratch test standard for analyzing a surface scratch that takes into account the full three-dimensional...
The objective of this work was to evaluate a set of standardized metrics proposed for characterizing a surface that has been scratched from a two-body abrasion test. This is achieved by defining a new abrasion region termed ‘Zone of Interaction’ (ZOI). The ZOI describes the full surface profile of all peaks and valleys, rather than just measuring a scratch width as currently defined by the ASTM G...
A sealing ring is an important component of a mechanical sealing unit, since it influences the tightness of the joint. Investigations were conducted for rings made from five different materials, namely: ceramics Al 2 O 3 , carbon impregnated by antimony, sintered silicon carbide, chromium–molybdenum alloy and tungsten carbide. 2D and 3D measurements have been conducted on rings. All...
Within the context of 5-axis free-form machining, CAM software offers various ways of tool-path generation, depending on the geometry of the surface to be machined. Therefore, as the manufactured surface quality results from the choice of the machining strategy and machining parameters, the prediction of surface roughness in function of the machining conditions is an important issue in 5-axis machining...
Accurate simulation of rolling-tyre vibrations, and the associated noise, requires knowledge of road-surface topology. Full scans of the surface types in common use are, however, not widely available, and are likely to remain so. Ways of producing simulated surfaces from incomplete starting information are thus needed. In this paper, a simulation methodology based solely on line measurements is developed,...
In the present article, the dry sliding wear behavior of aluminum matrix nanocomposites containing various amounts of Al 2 O 3 –AlB 12 (5, 10 and 15wt.%) particles was investigated. All specimens were prepared by mechanical milling of Al and Al 2 O 3 –AlB 12 nanocomposite powders, followed by hot pressing. Wear tests were carried out at room temperature...
Wear behaviors of hardmetal YG8B were examined in detail through a modified wet sand rubber rimmed wheel test system ASTM B611 using drilling fluids (slurries) with three types of coarse angular sands, SiC, Al 2 O 3 and SiO 2 , respectively, and an extremely long sliding distance up to more than 60km was adopted. Under the same condition, the volume loss of hardmetals was positively...
Fe–Cr–Ni metastable austenitic stainless steel is widely used in industry because of its excellent performance of corrosion resistance in aggressive environment. The process of drawing austenitic stainless steel easily prompts to wear and the relevant friction behavior, under the condition of friction coupling plastic deformation, is seldom studied. This paper studies the friction behavior of SUS...
Carbon fabric (CF) reinforced polyethersulphone (PES) composites were fabricated using solution impregnation technique. Cold remote nitrogen–oxygen plasma (CRNOP) treatment to the CF was done to enhance the fiber–matrix adhesion. The developed composites based on treated and untreated CF were evaluated for tribological properties in sliding/adhesive wear mode under various operating conditions such...
Recent advancements in hip arthroplasty have allowed the operation to boast excellent results and high survivorship. However, failures do still occur and a major cause is complications arising from wear debris. It is essential therefore that debris is minimized by reducing wear at the bearing surface. One proposed method of achieving this wear reduction is through the use of metal-on-metal articulations...
The effect of anisotropicity of Norway spruce (Picea abies) during two-body abrasive wear was investigated by rubbing the wood with five different orientations while using constant surface pressure and a sanding belt with very fine abrasive grits. The anisotropic nature was found to affect the microstructure of the worn surface and the breakage mechanism of the surface. The properties of the particles...
In this work nickel based hardfacing alloy (Colmonoy 5) was deposited on 316L (N) stainless steel substrate to study the effects of aging treatment on coating microstructure, wear and corrosion properties. Coatings, deposited through plasma transferred arc (PTA) welding process, were aged at 923K for 5000h. Microstructural characterization studies carried out by scanning electron microscopy (SEM)...
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