Enhancement in Tribological and Mechanical Properties of Cemented Tungsten Carbide Substrates using CVD-diamond Coatings
Journal Title: Tribology in Industry - Year 2017, Vol 39, Issue 1
Abstract
An experimental investigation has been carried out to study the influence on the performance characteristics of a cutting tool material notably known as cemented tungsten carbide (WC-Co). A comparison has been documented between nanocrystalline diamond (NCD) and microcrystalline diamond (MCD) coatings deposited on two cemented tungsten carbide (WC-Co) substrates with the architectures of WC-Co/NCD and WC-Co/MCD, using hot filament chemical vapor deposition (HFCVD) technique. In the present work, the friction characteristics were studied using ball-on-disc type linear reciprocating micro-tribometer, under the application of 1–10 N normal loads, when sliding against smooth alumina (Al2O3) ceramic ball for the total duration of 20 min, under dry sliding condition. Nanoindentation tests were also conducted using Berkovich nanoindenter for the purpose of measurement of hardness and elastic modulus values. However, the average value of friction coefficient (COF) corresponding to MCD and NCD coatings decrease from ~0.37–0.32 and ~0.30–0.27, respectively when the load is increased from 1–10 N. However, for conventional WC-Co substrate the average COF increases from ~0.60–0.75, under the same input operating conditions. The wear tracks formed on the surfaces of NCD, MCD and WC-Co, after sliding were characterised using Raman spectroscopy and scanning electron microscopy (SEM) techniques. Therefore, the results will serve breakthrough information for the designer to design the cutting tool or mechanical component using this novel coating procedure.
Authors and Affiliations
K . A . Najar, N . A . Sheikh, M . A . Shah
Keywords
Related Articles
- EP ID EP228695
- DOI 10.24874/ti.2017.39.01.03
- Views 96
- Downloads 0
Friction and Material Modelling in Finite Element Simulation of Orthogonal Cutting
In the present paper the influence of the friction and material modelling on the results of the Finite Element simulations of machining is investigated. An orthogonal cutting model is proposed, which incorporates Coulomb...
Effect of TiN Nanoparticles on the Friction and Wear Properties of Spark Plasma Sintered Fe-Cr-Ni
This study evaluated the dry sliding wear and friction behaviour of spark plasma sintered Fe-Cr-Ni (a duplex stainless steel known as SAF 2205) matrix with titanium nitride (TiN) nanoparticles as reinforcement. Tests wer...
Possibilities of Application of High Pressure Jet Assisted Machining in Hard Turning with Carbide Tools
High Pressure Jet Assisted Machining (HPJAM) in turning is a hybrid machining method in which a high pressure jet of cooling and lubrication fluid, under high pressure (50 MPa), leads to the zone between the cutting tool...
Tribological Behavior of Journal Bearing Material under Different Lubricants
The friction and wear behavior of journal bearing material has been investigated using pin on disc wear tester with three different lubricating oils i.e. synthetic lubricating oil (SAE20W40), chemically modified rapeseed...
Three Body Abrasive Wear Behavior of Glass-Basalt PA66/PTFE Hybrid Composites in Multi pass Condition
The three body abrasive wear (3-BAW) of Glass – Basalt hybrid composites is studied. The PA66/PTFE blend(80/20 wt.%), Blend/Short glass fiber(SGF), Blend/Short Basalt fiber(SBF),Blend/10 wt.% SGF/10 wt.% SBF (GB) were th...