scholarly journals Reciprocating Friction and Wear Behavior of WC-Co Based Cemented Carbides Manufactured by Electro-Discharge Machining

2007 ◽  
Vol 561-565 ◽  
pp. 2025-2028 ◽  
Author(s):  
Koenraad Bonny ◽  
Patrick de Baets ◽  
Omer Van der Biest ◽  
Jef Vleugels ◽  
Bert Lauwers
Keyword(s):  
Wear Debris ◽  
Wear Behavior ◽  
Wear Behaviour ◽  
Surface Finishing ◽  
Cemented Carbides ◽  
Small Scale ◽  
Wear Loss ◽  
Binder Phase ◽  
Wear Performance ◽  
Electro Discharge Machining

Tungsten carbide based hardmetals with cobalt binder phase are widely used in engineering industries for their excellent mechanical properties and outstanding wear performance. Reciprocative sliding wear behaviour of a number of WC-Co based hardmetal grades was investigated using a small-scale pin-on-plate tribometer. Test samples were manufactured by electro-discharge machining (EDM) with various surface finishing regimes. SEM topographies and cross-section views of the cemented carbides were obtained both before and after dry friction tests, revealing distinctive wear mechanisms. The generated wear loss was quantified topographically using surface scanning equipment. Wear debris particles were collected and examined by EDX and TEM analysis. Based on experimental results, the execution of consecutive gradually finer EDM cutting steps was found to considerably enhance wear performance. Furthermore, a significant influence of contact load, sliding movement duration, application of lubricant and wear debris formation on wear rate and friction was established.

scholarly journals Influence of Surface Finishing and Binder Phase on Friction and Wear of WC Based Hardmetals

2007 ◽  
Vol 561-565 ◽  
pp. 2403-2406 ◽  
Author(s):  
Koenraad Bonny ◽  
Patrick de Baets ◽  
Omer Van der Biest ◽  
Jef Vleugels ◽  
Bert Lauwers
Keyword(s):  
Friction And Wear ◽  
Surface Finishing ◽  
Cemented Carbides ◽  
Wear Volume ◽  
Binder Phase ◽  
Well Test ◽  
Wear Performance ◽  
The One ◽  
Sliding Distance ◽  
Nickel Binder

At present, cobalt is the most commonly used binder material in tungsten carbide based hardmetals. Current research on sliding wear performance of these cemented carbides, however, reveals promising results for nickel binder as well. Test samples of WC-Co and WC-Ni hardmetals have been machined and surface finished by wire-EDM and grinding. From comparative dry sliding pin-on-plate experiments on wire-EDM’ed, ground and polished grades, correlations are derived between wear volume loss and friction on the one hand and contact pressure, sliding distance, binder phase and microstructure on the other hand. The lowest wear levels are encountered with polished cemented carbides. The EDM induced surface modification turns out to deteriorate wear resistance, especially during the running-in stage of sliding. These findings are in agreement with Xray diffraction measurements of the residual stress level in the WC phase.

scholarly journals Effects of Cr3C2 Addition on Wear Behaviour of WC-Co Based Cemented Carbides

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 895 ◽  
Author(s):  
Luca Boccarusso ◽  
Fabio Scherillo ◽  
Umberto Prisco
Keyword(s):  
Grain Size ◽  
Rupture Strength ◽  
Ceramic Materials ◽  
Extrusion Process ◽  
Wear Behaviour ◽  
Cemented Carbides ◽  
Tribological Behaviour ◽  
Wear Performance ◽  
Bulk Hardness ◽  
Wear Tests

Microstructure, hardness, transverse rupture strength, and abrasion resistance of WC-10 wt% Co cemented carbides modified with the addition of different mass fraction of Cr3C2, in the range of 0–3 wt%, are studied. The influence of the microstructure, composition and hardness on the mechanical properties and wear resistance is analysed. Considering that the material under investigation can be used as die for the extrusion process of hard ceramic materials, the tribological behaviour was evaluated by performing sliding wear tests in wet conditions using a block-on-ring tribometer. Wear mechanism principally based on binder removal and subsequent fragmentation and microabrasion of the WC grains is proposed. Carbide grain size and bulk hardness can be tuned as function of specific applications by adding different amounts of Cr3C2. In particular, increasing hardness and reducing grain size by the addition of Cr3C2 are demonstrated to considerably enhance the wear performance of these carbides.

Investigation on Two-Body Abrasive Wear Behavior of Tungsten Carbide Filled Glass Fabric-Epoxy Hybrid Composites

2010 ◽  
Vol 123-125 ◽  
pp. 1039-1042 ◽  
Author(s):  
S.P. Kumaresh Babu ◽  
Anand Chairman ◽  
N. Mohan ◽  
Siddaramaiah
Keyword(s):  
Abrasive Wear ◽  
Tungsten Carbide ◽  
Large Scale ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Constant Load ◽  
Glass Fabric ◽  
Wear Behaviour ◽  
Wear Loss ◽  
Wear Rates

The effect of tungsten carbide (WC) particulate fillers incorporation on two-body abrasive wear behaviour of glass fabric reinforced-epoxy (GE) composites was investigated and findings are interpreted. The wear behaviour of the composites were performed using pin-on-disc tester at varying abrasive distances viz., 25,50,75 and 100 m at a constant load of 20 N. The experiment was conducted using two different water proof silicon carbide (SiC) abrasive papers and at two different velocity under multi-pass condition. The wear loss of the composites found increasing with increase in abrading distances. A significant reduction in wear loss and specific wear rates were noticed after incorporation of WC filler into GE composite. This result indicates a significant improvement in wear resistance after incorporation of WC filler. The WC loaded systems exhibit less wear of matrix during abrasion which in turn facilitates lower fiber damage, due to the presence of WC particles on the counter surface which act as a transfer layer and effective barrier to prevent large-scale fragmentation. The worn out surface features were examined through scanning electron microscopy (SEM) in order to probe the wear mechanism.

Wear Behaviour of Two Different Cemented Carbide Grades in Turning 316 L Stainless Steel

2018 ◽  
Vol 941 ◽  
pp. 2367-2372 ◽  
Author(s):  
Sara Saketi ◽  
Ulf Bexell ◽  
Jonas Östby ◽  
Mikael Olsson
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Wear Behavior ◽  
Cutting Tools ◽  
Cemented Carbide ◽  
Wear Behaviour ◽  
Binder Phase ◽  
Mechanical Wear ◽  
Cutting Insert

Cemented carbides are the most common cutting tools for machining various grades of steels. In this study, wear behavior of two different cemented carbide grades with roughly the same fraction of binder phase and carbide phase but different grain size, in turning austenitic stainless steel is investigated. Wear tests were carried out against 316L stainless steel at 180 and 250 m/min cutting speeds.The worn surface of cutting tool is characterized using high resolution scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), Auger electron spectroscopy (AES) and 3D optical profiler.The wear of cemented carbide in turning stainless steel is controlled by both chemical and mechanical wear. Plastic deformation, grain fracture and chemical wear is observed on flank and rake face of the cutting insert. In the case of fine-grained, the WC grains has higher surface contact with the adhered material which promotes higher chemical reaction and degradation of WC grains, so chemical wear resistance of the composites is larger when WC grains are larger. The hardness of cemented carbide increase linearly by decreasing grain size, therefore mechanical wear resistance of the composites is larger when WC grains are smaller.

scholarly journals Influence of Glassy Carbon Surface Finishing on Its Wear Behavior during Precision Glass Moulding of Fused Silica

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 692 ◽  
Author(s):  
Tim Grunwald ◽  
Dennis Patrick Wilhelm ◽  
Olaf Dambon ◽  
Thomas Bergs
Keyword(s):  
High Precision ◽  
Glassy Carbon ◽  
Mechanical Load ◽  
Wear Behavior ◽  
Tool Material ◽  
Surface Preparation ◽  
Fused Silica ◽  
Carbon Surface ◽  
Wear Behaviour ◽  
Surface Finishing

Laser technology has a rising demand for high precision Fused Silica components. Precision Glass Moulding (PGM) is a technology that can fulfil the given demands in efficiency and scalability. Due to the elevated process temperatures of almost 1400 °C and the high mechanical load, Glassy Carbon was qualified as an appropriate forming tool material for the moulding of Fused Silica. Former studies revealed that the tools’ surface finishing has an important influence on wear behaviour. This paper deals with investigation and analysis of surface preparation processes of Glassy Carbon moulds. In order to fulfil standards for high precision optics, the finishing results will be characterised by sophisticated surface description parameters used in the optics industry. Later on, the mould performance, in terms of wear resistance, is tested in extended moulding experiments. Correlations between the surface finish of the Glassy Carbon tools and their service lifetime are traced back to fundamental physical circumstances and conclusions for an optimal surface treatment are drawn.

Study on the Friction and Wear Behavior of Grind-Hardened Layer

2010 ◽  
Vol 431-432 ◽  
pp. 385-388 ◽  
Author(s):  
Jian Hua Zhang ◽  
Pei Qi Ge ◽  
Lei Zhang ◽  
Yang Yu ◽  
Hui Li
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Wear Debris ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Hardened Layer ◽  
Hardened Steel ◽  
Wear Performance ◽  
Friction And Wear Behavior ◽  
Grind Hardening

The grind-hardening technology utilizes the grinding heat to harden the surface of the workpiece. The friction and wear performance of the grind-hardened layer is one of the important parameters. In this paper, the friction and wear performance of the grind-hardened layer was studied by the friction and wear experiment. The wear rate and the friction coefficient of the grind-hardened steel were studied by comparing with conventional hardened steel and non-hardened steel. The surface worn morphology and the collected wear debris of the grind-hardened steel were observed during the experiment. The wear mechanism of the grind-hardened steel was analyzed under different friction conditions.

Research on Friction and Wear Behavior of Rubber in the Mixture of Crude Oil with Water

2013 ◽  
Vol 300-301 ◽  
pp. 1254-1258 ◽  
Author(s):  
Xiao Ren Lv ◽  
Xu Yao Huo ◽  
Guang Zu Qu ◽  
Shi Jie Wang
Keyword(s):  
Crude Oil ◽  
Water Content ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Frictional Coefficient ◽  
Water Film ◽  
Wear Test ◽  
Wear Behaviour ◽  
Wear Loss ◽  
Butadiene Rubber

In order to choose the rubber material and improve the service life of Progressing Cavity Pump (PCP ) when exploiting offshore crude oil, it is important to analyze friction and wear behaviour of stator and rotor of PCP in the mixture of crude oil with different water content. The friction and wear test about Nitrile -Butadiene Rubber (NBR) and Fluorine Rubber (FKM) were carried on ring-on-block tester, the wear loss was observed by electron microscope, the wear mechanism was also discussed. The results show that: (1) FKM owns better wearing resistance than NBR in the mixture of crude oil with different water content; (2) when the content of water in the mixture is less than 26%, the frictional coefficient of sample is 0.05, due to the oil film between the friction pairs; (3) when the content of water in the mixture is more than 26%, the frictional coefficient increases to 0.4, because of the water film between the friction pairs.

The Effect of Surface Finishing on the Tribological Behavior of a 94% Alumina Ceramic Material

1988 ◽  
Vol 140 ◽  
Author(s):  
Jeffrey L. Spodnik ◽  
James J. Wert
Keyword(s):  
Ceramic Material ◽  
Wear Behavior ◽  
Surface Finishing ◽  
Transgranular Fracture ◽  
Binder Phase ◽  
Mode Iii ◽  
Stick Slip ◽  
Surface Finishes ◽  
The Coefficient Of Friction ◽  
Effect Of Surface

AbstractThe effect of surface finish on the unlubricated sliding wear behavior of a 94% A12O3 ceramic material has been investigated using a reciprocatingright cylinder-on-flat tribometer. The surface finishes evaluated were produced using a combinationof SiC and diamond abrasive particles.Profilometry was employed to characterize surface topography and x-ray diffraction was used to determine the residual stress associated with each finishing process.The coefficients of friction and controlling wear mechanisms varied dramatically as the maximum asperity height was altered by different finishing techniques. Below a peak profile of 0.25 μm, the coefficient of friction varied between 0.60 and 0.75 due to preferential shearing of the siliceous binder phase which segregated at surfacial pores and grain boundaries. Binder adhesion in the sliding contact produced stick-slip frictional behavior. Surfaces with asperity heights in excess of 10 μin exhibited intergranularfracture or grain “pluck-out”. These surfaces contained minimal real areas of contact and yielded friction coefficients of 0.30 - 0.35. Removed alumina grains actedas hard abrasives in the contact zone and enhanced transgranular fracture by a lateral cracking mechanism. Evidence of crack propagation as a result of Mode II and Mode III shearloading was discovered at subsurface pore sites. The influences of microindentation hardness and fracture toughness are discussed in terms of their relative importances on the observed wear behavior.

scholarly journals Room- and high temperature Wear Resistance of MCrAlY Coatings Deposited by Detonation Gun (D-gun) and Supersonic Plasma Spraying (SSPS) Techniques

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1107
Author(s):  
Mehmet Kilic ◽  
Dervis Ozkan ◽  
Mustafa Sabri Gok ◽  
Abdullah Cahit Karaoglanli
Keyword(s):  
High Temperature ◽  
Plasma Spraying ◽  
Wear Behavior ◽  
Substrate Material ◽  
Wear Loss ◽  
Wear Performance ◽  
High Temperature Wear ◽  
Nickel Based Superalloy ◽  
Supersonic Plasma ◽  
Detonation Gun

In this study, CoNiCrAlY metallic coatings were deposited on an Inconel 718 nickel-based superalloy substrate material using the detonation gun (D-gun) and supersonic plasma spraying (SSPS) techniques. The microstructural and mechanical properties in addition to their room and high temperature wear behavior of the produced coatings were evaluated. The wear tests were performed at room temperature (rt), 250 and 500 °C using 2N and X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) analyses of the worn coatings were performed to assess their wear performance. The coatings produced with D-gun process exhibited higher hardness and lower porosity (550 ± 50 HV0.25 hardness and 1.2 ± 1.0% porosity) than SSPS coatings (with 380 ± 30 HV0.25 hardness and 1.5 ± 1.0% porosity) which resulted in better room- and high temperature wear performance for D-gun coatings. The worn surfaces of both coatings exhibited formation of tribological layers and superficial microstructural changes by varying temperature and load conditions. Increasing load and temperature resulted in increased wear loss whereas increasing temperature resulted in reduced COF values for both coatings.

Edge Effects in Sliding Wear Behavior of ZrO2-WC Composites and WC-Co Cemented Carbides

2007 ◽  
Vol 561-565 ◽  
pp. 503-506 ◽  
Author(s):  
Koenraad Bonny ◽  
Patrick de Baets ◽  
Omer Van der Biest ◽  
Jef Vleugels ◽  
Bert Lauwers
Keyword(s):  
Grain Size ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Ceramic Composites ◽  
Cemented Carbides ◽  
Dry Sliding Wear ◽  
Small Scale ◽  
Electrically Conductive ◽  
Size Refinement ◽  
Grain Size Distributions

A trend in the development of WC based cemented carbides and zirconia based ceramic composites is grain size refinement and more narrow grain size distributions of the starting powder, in order to accomplish higher hardness and abrasive wear resistance. The current work reports the results of dry sliding wear experiments on laboratory-made electrically conductive ZrO2-WC composites and commercially available WC-Co based cemented carbides, which have been manufactured and finished by rough cutting wire EDM with consecutive execution of gradually finer EDM regimes. Tribological data are obtained using a small-scale pin-on-plate test rig. Wear tracks are analyzed by surface scanning topography and scanning electron microscopy, revealing that the outer extensions of the wear tracks exhibit some differences in wear behavior compared to the central parts.

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