Effect of transverse current injection on the tribological properties of WC cemented carbide (original) (raw)
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International Journal of Refractory Metals & Hard Materials, 2009
A number of commercially available WC-Co-based cemented carbides with 6 up to 12 wt.% Co were machined and surface finished by grinding as well as by wire electrical discharge machining (EDM) in demineralised water through a number of consecutive gradually finer EDM regimes. Comparative dry reciprocating sliding wear experiments on both wire-EDM and ground samples against WC-Co pins were conducted, using a pin-on-plate test rig, in order to investigate the influence of the EDM process on the tribological behavior. The worn surfaces of the investigated cemented carbides were scanned topographically and characterised by scanning electron microscopy (SEM). The post-mortem obtained wear volumes were compared to the online measured wear in order to determine correlations between wear volume and wear rate on the one hand and sliding distance on the other hand. The experimental results revealed a profound influence of surface finish conditions and distinctive EDM regimes on the wear behavior of WC-Co cemented carbides.
Mapping of impact-abrasive wear performance of WC–Co cemented carbides
Wear, 2015
A reliable evaluation of the wear resistance of materials used in conditions of combined impact and abrasion is of a paramount importance for industrial applications. A new tribo-device for studying impact-abrasive wear performance of materials was worked out. The specimen is pressed against a rotating steel wheel with abrasive being fed by gravity between them. The generator is supplying the tribosystem with impacts of predefined energy in a range of 0-19 J and a frequency up to 55 Hz. Cemented carbides of different binder content (6, 8, and 15 wt%) and carbide grain size (fine, medium, and coarse) were tested for impact-abrasive wear resistance. Maps reflecting the performance of cemented carbides at low and medium stress abrasion as well as medium stress abrasion combined with impact are constructed. The maps assessing the effects of stress intensity, dynamic loading, and combined effect of increase in stress and application of the dynamic load are thoroughly discussed. Microstructural analysis of the wear mechanisms is performed to support the conclusions.
Friction and wear behaviour of cemented carbides
Wear, 2004
In this paper the friction and sliding wear of WC–Co cemented carbides are studied. Friction and wear tests were carried out using six different WC–Co alloys (Co ranging from 6 to 20wt.%) under unlubricated conditions against steel (0.45wt.% C) disk. Tests were performed at sliding velocity of 2.2ms−1 and normal load of 40 and 180N. Sliding wear tests were carried
Journal of Asian Ceramic Societies, 2020
Compositional effects on the dry sliding wear resistance of micrometer-grained WC-10 wt.%(Co +Fe+Ni) cemented carbides pressureless sintered with 2 wt.% Ni but different Fe/Co ratios were investigated. Their microstructures are very similar except for the contiguity of the WC grains, which increased with increasing Fe/Co ratio. Also, these cemented carbides are all almost fully dense, but with the degree of residual porosity exhibiting a complex trend with increasing Fe/Co ratio (first decreasing and then increasing). The greatest densification was reached for an Fe/Co ratio of 1. The reverse trend was observed for the hardness, which reached HV 10 =1090 kg/mm 2 for Fe/Co = 1, indicative that it is dictated essentially by the porosity. The wear resistance correlated inversely with the porosity (and thus directly with the hardness), so that the densest (and thus the hardest) of these cemented carbides (the one sintered with a Fe/Co ratio of 1) also exhibited the lowest coefficients of friction, the lowest specific wear rates, and the lowest microstructural damage. The wear mode was abrasion, with the wear mechanism being plastic deformation and especially fracture. Thus, optimization of the wear resistance of WC-(Co+Fe+Ni) cemented carbides for tribological applications is feasible by a judicious design of their binder composition.
Wear, 2009
A number of commercially available WC-Co-based cemented carbides with 6 up to 12 wt.% Co were machined and surface finished by grinding as well as by wire electrical discharge machining (EDM) in demineralised water through a number of consecutive gradually finer EDM regimes. Comparative dry reciprocating sliding wear experiments on both wire-EDM and ground samples against WC-Co pins were conducted, using a pin-on-plate test rig, in order to investigate the influence of the EDM process on the tribological behavior. The worn surfaces of the investigated cemented carbides were scanned topographically and characterised by scanning electron microscopy (SEM). The post-mortem obtained wear volumes were compared to the online measured wear in order to determine correlations between wear volume and wear rate on the one hand and sliding distance on the other hand. The experimental results revealed a profound influence of surface finish conditions and distinctive EDM regimes on the wear behavior of WC-Co cemented carbides.
2018
DISCUSSION ON IMPORTANCE OF TUNGSTEN CARBIDE-COBALT (WC-Co) CEMENTED CARBIDE AND ITS CRITICAL CHARACTERIZATION FOR WEAR MECHANISMS BASED ON MINING APPLICATIONS OMÓWIENIE ROLI WĘGLIKA SPIEKANEGO Z KOBALTEM WC-Co ORAZ OKREŚLENIE JEGO KLUCZOWEJ CHARAKTERYSTYKI NIEZBĘDNEJ DO ROZPOZNANIA MECHANIZMÓW ZUŻYCIA W KONTEKŚCIE ZASTOSOWAŃ W GÓRNICTWIE Cemented carbide (CC) is an important material for the mining tools. During mining applications, the service life of the CC gets highly reduced due to complex conditions offered by mines. In various applications, such as, rock drilling and coal cutting, the tools show different type of wear behaviour. Wear assessment has been an important area of research for a long time. In order to develop improved mechanical properties in the tools, it is necessary to know the characteristics and cause of wear mechanisms. For analyzing wear mechanisms in the CC, researchers have adopted mainly three different conditions. They are: rock drilling, coal cutting, and laboratory wear test methods. In the present work, an attempt has been made to review and summarize all those wear mechanisms found in the CC. The causes and effects of each mechanism are also explained comprehensively. In addition, various properties of recently developed cemented carbide have also been discussed.
Influence of electrical discharge machining on sliding friction and wear of WC–Ni cemented carbide
Tribology International, 2010
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Wear, 2009
Two grades of WC-10 wt.%Co cemented carbide with or without addition of Cr 3 C 2 /VC grain growth inhibitor during liquid phase sintering were produced with the goal to investigate their reciprocating sliding friction and wear behaviour against WC-6 wt.%Co cemented carbide under unlubricated conditions. The tribological characteristics were obtained on a Plint TE77 tribometer using distinctive normal contact loads. The generated wear tracks were analyzed by scanning electron microscopy and quantified topographically using surface scanning equipment. The post-mortem obtained wear volumes were compared to the online assessed wear. Correlations between wear volume, wear rate and coefficient of friction on the one hand and sliding distance and microstructural properties on the other hand were determined, revealing a significant influence of Cr 3 C 2 /VC on the friction characteristics and wear performance.
Jurnal Tribologi, 2016
A comparison has been documented between nanocrystalline diamond (NCD) and microcrystalline diamond (MCD) coatings deposited on cemented tungsten carbide (WC-Co) substrates with architectures of WC-Co/NCD & WC-Co/MCD, using hot filament chemical vapor deposition (HFCVD) technique. In the present work, the frictional characteristics were studied using ball-on-disc type linear reciprocating micro-tribometer, under the application of 1–10N normal loads, when sliding against smooth alumina (Al2O3) ceramic ball for the total duration of 15min, under dry sliding conditions. Nanoindentation tests were also conducted using Berkovich nanoindenter for the purpose of measurement of hardness and elastic modulus values. The average coefficients of friction of MCD and NCD coatings decrease from 0.37 – 0.32 and 0.3 – 0.27 respectively, when the load is increased from 1–10N. However, for conventional WC-Co substrate the average coefficient of friction increases from 0.60–0.75, under the same input ...