Location of Repository

On the mechanisms of wetting characteristics modification for selected metallic materials by means of high power diode laser radiation

By Jonathan Lawrence and Lin Li

Abstract

This work elucidates and analyses the factors responsible for modifications to the wettability characteristics of metallic materials after high power diode laser (HPDL) treatment. It was found that interaction of EN3 and EN8 mild steel with HPDL radiation resulted in the wettability characteristics of the mild steels altering to various degrees depending upon the laser processing parameters. Such changes in the wettability characteristics of the mild steels were found to be due essentially to: (i) modifications to the surface roughness; (ii) changes in the surface O2 content and (iii) the increase in the polar component of the surface energy. All of these factors were seen to influence the wettability characteristics of the mild steels, however, the degree of influence exerted by each was found to differ. Work was therefore conducted to isolate each of these influential factors, thereby allowing the magnitude of their influence to be determined. This analysis revealed that surface roughness was the primary influential factor governing changes in  and hence the wettability characteristics of the mild steels. Surface energy, by way of microstructural changes, was also shown to influence to a lesser extent changes in the wettability characteristics, whilst surface O2 content, by way of process gas, was found to play a minor role in inducing changes in the wettability characteristics of the mild steels

Topics: H680 Optoelectronic Engineering, H700 Production and Manufacturing Engineering
Publisher: Laser Institute of America
Year: 2002
OAI identifier: oai:eprints.lincoln.ac.uk:3248

Suggested articles

Preview

Citations

  1. (1984). Adsorption and the Gibbs Surface Excess doi
  2. (2000). co s θθ θθ Untreated
  3. Contact angles for a vitreous enamel on (a) the as-received EN8 mild steel surface, and (b) the HPDL treated mild steel surface (1500 mm min -1 traverse speed, O2 atmosphere).
  4. (1993). de Hosson, doi
  5. Mean values of contact angle formed between glycerol at 20 0C and the EN3 and EN8 mild steel before and after HPDL treatment in the various process gas environments (1500 mm min -1).
  6. (1999). PhD thesis,
  7. Surface O2 content of the EN3 and EN8 mild steels before and after HPDL treatment in the various process gas environments (1500 mm min -1 traverse speed).
  8. (1996). Surface treatment and film deposition” in Laser processing doi
  9. Typical SEM surface images of the EN8 mild steel (a) as received and (b) after HPDL treatment (1500 mm min -1 traverse speed, O2 atmosphere).
  10. (1978). Wetting spreading and adhesion
  11. (2000). γ γ γ γ γ γ γ lv d lv doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.