Author:Mabhali, Luyolo AB; Pityana, Sisa L; Rampedi, DLDate:Oct 2008The objective of this study was to improve the surface hardness and wear resistance of Al AA1200 by laser alloying with mixed Ni and Ti powders. This presentation reports on the experimental methods, the results and conclusionRead more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Sacks, NDate:Jul 2010Aluminium is vastly used in industry due to its low cost, light weight and excellent workability, but lacks in wear resistance and hardness. Laser alloying is used to improve the surface properties such as hardness by modifying the composition ...Read more
Author:Arthur, Nana KKDate:Apr 2019The laser engineered net shaping (LENS) system was used for the laser based manufacturing of a test geometry used to assess the performance of additive manufacturing systems. This system was preferred over a selective laser melting (SLM) ...Read more
Author:Kazadi, P; Van Rooyen, Corney; Burger, HDate:Mar 2006Laser refurbishment capabilities were demonstrated and promising results were obtained for repair of distance sleeves, foot rolls, descaler cassette, idler rolls. Based on the cost projections and the results of the in-situ testing, components ...Read more
Author:Forbes, A; Schulze, C; Flamm, D; Dudley, Angela L; Duparre, MDate:Apr 2013We show how laser beam characterization may be done in real-time with digital holograms. We illustrate the power of the techniques by applying them to a variety of laser sources, from fibers to solid-state.Read more
Author:Forbes, ADate:Aug 2006Many analytical techniques exist to explore the propagation of certain laser beams in free space, or in a linearly absorbing medium. When the medium is nonlinearly absorbing the propagation must be described by an iterative process using the ...Read more
Author:Masina, Bathusile N; Bodkin, R; Mwakikunga, Bonex W; Forbes, ADate:Aug 2011This paper presents an implementation of a laser beam shaping system for both heating a diamond tool and measuring the resulting temperature optically. The influence the initial laser parameters have on the resultant temperature profiles is ...Read more
Author:Litvin, IA; Burger, L; De Gama, MP; Mathye, A; Forbes, ADate:Sep 2007Recent approaches to demonstrating adaptive optics and atmospheric turbulence have made use of spatial light modulators (SLMs) as the active phase element. However, there are limitations in using SLMs as an accurate method of simulating ...Read more
Author:Forbes, A; Lizotte, TEDate:Sep 2012Full content of the proceedings of the Laser Beam Shaping XIII conference held in San Diego, California, United States.Read more
Author:Bolokang, Amogelang S; Mathabathe, Maria NDate:Apr 2021The shroud shelve life of turbine blades depends on wear resistance. Thus, the wear of blade shroud shelves’ contact area ascertains the overall service life of gas turbine engines (GTE). Moreover, research shows that the life service of ...Read more
Author:Van Rooyen, Corney; Burger, H; Theron, MarithaDate:Jun 2009Laser cladding crack repair of austenitic stainless steel vessels subjected to internal water pressure was evaluated. The purpose of this investigation was to develop process parameters for in-situ repair of through-wall cracks in components ...Read more
Author:Kumar, S; Pityana, Sisa LDate:Mar 2010Modification of Aluminium surface by injecting, dispersing and melting TiB2 powder with the help of a laser beam promises to enhance tribological properties of Aluminium. The present work consists of making single lines and various overlapping ...Read more
Author:Lengopeng, T; Botes, A; Popoola, APIDate:Nov 2014This paper evaluates the effect of process parameters (laser power and scanning velocity) on clad layer height, heat affected zone (HAZ) width, metallurgical bonding to base metal and Vickers microhardness profiles of clad layers of various ...Read more
Author:Phume, L; Pityana, Sisa L; Meacock, C; Popoola, APIDate:Dec 2012The objectives of this study were to investigate laser surface coating of Ti6Al4V with preplaced Hafnium powder, and to determine the influence of the energy density on the characteristics of bonding and the microstructure.Read more
Author:Baloyi, N; Tlotleng, Monnamme; Meacock, Christopher; Pityana, Sisa L; Majumdar, JDDate:Nov 2012Laser coating is an advanced coating technology for improving the surface properties of various components. These coatings are extremely dense, crack-free and have non-porous microstructures. Coatings archived by laser based coating technology ...Read morecb
Author:Baloyi, NM; Popoola, API; Pityana, Sisa LDate:May 2014Coating is a technology for improving the surface properties of components. Laser coating produces uniform composition with thickened layers that display a good metallurgical bond to the base material. These coatings are dense and crack-free, ...Read more
Author:Botha, L; Du Plessis, A; Uys, H; de Clercq, LDate:01 Sep 2010Coherent control of quantum dynamics in optical, molecular and biological systems is a rapidly advancing field with many possible applications. This field of study was originally motivated by the goal of steering photoreactions into specific ...Read more
Author:Popoola, API; Pityana, Sisa L; Popoola, OMDate:Oct 2011Poor corrosion performance of aluminium alloys in marine environment has been a subject of intensive research recently. Aluminium substrate was alloyed with a combination of two metallic powders (Cu + Mo) using an Nd: YAG solid state laser. ...Read more