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Title: Modification of surface topography : manufacturing methods and applications
Author: Costa, Henara Lillian
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2005
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Six texturing methods were investigated experimentally. Some were used to produce samples or tools, although they are already conventional texturing methods. The innovative techniques proposed were developed to different extents. In particular, two techniques were proposed and investigated in detail: maskless electrochemical texturing, and the use of inkjet printing to mask metal surfaces before chemical texturing. A great number of applications could be proposed for surface texturing. For each application, design requirements help to decide which methods should be used to texture the surfaces involved. The main application for surface texturing investigated in this work was the increase of tribological performance under lubricated sliding conditions. Carbon steel samples with different geometrical surface patterns were tested in lubricated reciprocating sliding tests. Low normal loads guaranteed that elastic deformation was very small. The intrinsic variable speed of the test allowed the investigation of different regimes of lubrication, although the analysis mainly focused in the regions of maximum speed, where full film lubrication prevails. Different normal loads were tested. The effect on friction force and film thickness of the size, shape and distribution of the features that compose the patterns was established. Patterns containing chevrons with the vertex oriented along the sliding direction resulted in the largest increase of the film thickness due to increase of hydrodynamic pressure. Strip drawing tests were also used, in order to evaluate the effect of texturing in conditions involving plastic deformation. Significant variation of friction force was observed between different textures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available