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Wear behaviour of laser cladded and plasma sprayed WCCo coatings

Authors
Journal
Wear
0043-1648
Publisher
Elsevier
Publication Date
Volume
212
Issue
2
Identifiers
DOI: 10.1016/s0043-1648(97)00127-0
Keywords
  • Tungsten Carbide
  • Laser Cladding
  • Coating
  • Plasma
  • Wear Rate
  • WcCo

Abstract

Abstract The usefulness of WCCo cermets as wear resistant material for coatings is determined by the cladding technique employed. This paper compares the features of an 83% WCCo coating on an AISI 1043 steel substrate using two different application techniques: plasma spraying and laser cladding. Results show significantly less porosity, improved coating hardness and better layer-substrate adherence in laser cladded than in plasma sprayed coatings. This causes them to have different wear behaviour which was determined using a method developed on the basis of the PV factor theory using sliding linear contact of flat-cylinder type. The method proved that wear rate ( V d′) is directly proportional to the product of coefficient of friction (μ), load ( C) and applied speed ( V), V d′ = KμCV, where proportionality constant, K, is different for every material and depends on conditions such as lubrication, temperature, etc. To study wear behaviour, laser cladded and plasma sprayed 83% WC-Co coatings, under extreme lubrication, were placed against a hardened and tempered AISI 1043 steel, at different load and sliding speed rates. As a result constant K was estimated for each coating. The tests also showed that wear rate in laser deposited coatings is approximately 34% lower than in plasma sprayed coatings.

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