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Research Papers: Coatings & Solid Lubricants

Study of the Effect of Type (Cu, Ti and Cu, Mo) Electrospark Coatings on Friction in Pin-on-Disk Testing

[+] Author and Article Information
Antoszewski Bogdan

 Technical University of Kielce, Kielce 314, Polandktrba@tu.kielce.pl

Evin Emil

 Technical University of Kosice, Kosice 0400 01, Slovakiaemil.evin@tuke.sk

Audy Jaromír

 Edith Cowan University, FRPS Bunbury, Bunbury 6230, Western Australiaj.audy@ecu.edu.au

J. Tribol 130(2), 021303 (Mar 13, 2008) (6 pages) doi:10.1115/1.2842296 History: Received April 22, 2007; Revised November 14, 2007; Published March 13, 2008

Recent advances in the commercial exploitation of electrospark coatings have focused on improving surface roughness by depositing Ti, Mo, V, or W over an interlayer of Cu, Sn, Pb, or Cd on the top of a tool steel material. This paper presents results of a systematic pin-on-disk experimental study of different type bilayer coatings (Cu–Sn/bronze, bottom layer; Ti and Mo, top layer) deposited on a Type 45 steel. The results are discussed in terms of friction coefficients obtained under different dry-friction conditions (speeds ranging from 0.3msto0.8ms, and pressures ranging from 10Nto40N). An additional focus is on scuffling resistance of faces in friction, microhardness and surface roughness of coated items, and the competitive advantage of using advanced surface coatings.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

An example of SEM images of different PVD “arc” coatings on a Type HSS M1 grade tool steel substrate materials, after Audy (13)

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Figure 2

A plot showing tool life (as a number of holes) against different PVD “arc” coatings, after Audy (13)

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Figure 3

A plot showing relationship between Ra and K values for different types of bilayer coatings

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Figure 4

An example of SEM images of the Cu+Ti coating (a) and Cu+Mo coating (b), photographed at magnifications of 3500× and 2000×, respectively, including relevant linear element distributions

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Figure 5

Microhardness of the Cu+Ti and Cu+Mo coatings in the top layer, and the heat-affected zone (HAZ) in the bottom layer, including microhardness of a Type 45 steel bare work material

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Figure 6

Kinematic schemes of friction experiments showing pin and disk trials (a), and details of roller and prisms (b)

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Figure 7

The mean values of abrasive load determined by using a Type Falex tester ((a) and (b)). A plot of load and friction force as a function of time for a Type 45 steel basic workpiece material in separate tests (b).

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