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Influence of Laser Glazing on the Characteristics and Tribological Performance of Plasma and Detonation Sprayed WC-Co Coatings
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2001 (Engelska)Ingår i: Proceedings of the International Thermal Spray Conference, 2001, s. 583-592Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper deals with a comprehensive evaluation of the laser glazing or re-melting route as a possible means of specifically enhancing the performance of thermal sprayed WC-Co coatings. In the present study, a high-power continuous-wave 9kW CO2 laser was utilized for laser treatment of plasma sprayed as well as detonation sprayed WC-Co coatings. The influence of the two most important laser-related variables, namely laser power and scan speed, on the properties of the laser-treated layers was investigated. Both mere surface densification by melting a thin top layer of the coating as well as melting of the entire portion of the coated layer were targeted during laser treatment. In each case, the laser treated coatings were fully characterized by optical microscopy, scanning electron microscopy, and microhardness measurements. In addition, the influence of laser processing on the elemental distribution, phase constitution and extent of defects in the treated layers was investigated. The tribological performance of the laser-glazed coatings was also evaluated and compared against the performance of their as-sprayed counterparts. The study has revealed significant differences between the response of plasma and detonation sprayed WC-Co layers when subjected to laser treatment. The potential of plasma-sprayed coatings to match the performance of the inherently superior detonation sprayed coatings by adopting laser glazing as a post-processing step has also been assessed.

Ort, förlag, år, upplaga, sidor
2001. s. 583-592
Nyckelord [en]
Carbides; Ceramic coatings; Laser beams; Optical microscopy; Particle size analysis; Plasma spraying; Porosity; Powder metallurgy; Tribology, Detonation spray coating (DSC); Laser glazing; Laser treatment, Sprayed coatings
Identifikatorer
URN: urn:nbn:se:hv:diva-8539OAI: oai:DiVA.org:hv-8539DiVA, id: diva2:860178
Konferens
Thermal Spray 2001 New Surfaces for a New Millennium: Proceedings of the International Thremal Spray Conferences; Singapore; Singapore; 28 May 2001 through 30 May 2001; Code 62385
Tillgänglig från: 2015-10-10 Skapad: 2015-10-10 Senast uppdaterad: 2015-10-10Bibliografiskt granskad

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