Author:Wilken, Ilana; Taljard, E; De Wet, FebeDate:Nov 2018Being a multilingual country rich in culture and diversity, South Africa has residents who use a variety of the 11 official languages for daily communication. Multilingual communication occurs especially in hospitals and clinics. People ...Read more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Sacks, NDate:Nov 2010Laser alloying of aluminium AA1200 was performed with a 4.4kW Rofin Sinar Nd:YAG laser to improve the surface hardness. Alloying was carried out by depositing Ni, Ti and SiC powders of different weight ratios on the aluminium substrate. The ...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: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: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: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: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
Author:Kumpaty, S; Coen, B; Coen, L; Tlotleng, Monnamme; Arthur, Nana KK; Pityana, Sisa LDate:Nov 2021Ti-6Al-4V is a common alloy known for its use in aerospace and/or biomedical applications. In this study, Mo has been employed to increase the biocompatibility of Ti-6Al-4V. Two samples of Ti-6Al-4V with layers of differing percentages of Mo ...Read more
Author:Abdulrahman, KO; Akinlabi, ET; Mahamood, RM; Pityana, Sisa L; Tlotleng, MonnammeDate:2018Development of additive manufacturing (AM) from three dimensional printers with ability of producing parts having no need for tooling continue to wax stronger in the manufacturing field. Laser metal deposition, a technique in AM is usually ...Read more
Author:Motha, S; Lekoadi, Paul; Raji, SA; Skhosane, Basebakhe S; Pityana, Sisa L; Tlotleng, MonnammeDate:Jun 2022Titanium alloys have two primary phases (a + ß) that are attributed to the a-stabiliser (aluminium) and ß-stabiliser (niobium). The latter stabilisers shift a-phase to higher temperature while the former stabilisers shift the ß-phase to lower ...Read more
Author:Michaelis, MM; Forbes, ADate:Jul 2006Early proposals for laser propulsion were surveyed. Propulsion theory and laboratory momentum coupling experiments demonstrate how it is possible to choose the target material so as to optimize payload efficiency, with a possible order-of-magnitude ...Read more
Author:Forbes, PBCDate:2008Polycyclic aromatic hydrocarbons (PAHs) occur in oil, coal and tar deposits, and are produced as byproducts of fuel burning (whether fossil fuel or biomass). At elevated levels, these pollutants are of concern due to their potential ...Read more
Author:Lekala, MB; Van der Merwe, JW; Pityana, Sisa LDate:May 2012The surfaces of AISI 316L stainless steel were laser alloyed with ruthenium powder and a mixture of ruthenium and nickel powders using a cw Nd:YAG laser set at fixed operating parameters. The microstructure, elemental composition, and corrosion ...Read more
Author:Nath, S; Pityana, Sisa L; Majumdar, JDDate:Mar 2012In the present study, laser surfac ealloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 ...Read more
Author:Nath, S; Pityana, Sisa L; Majumdar, JDDate:Mar 2012In the present study, laser surface alloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 ...Read more
Author:Mabhali, Luyolo AB; Pityana, Sisa L; Sacks, NDate:Dec 2010An Nd:YAG laser was used for surface alloying of aluminum AA1200. The alloying powder was a mixture of Ni and SiC in different ratios. A study of the microstructures obtained after alloying was conducted using optical and scanning electron ...Read more
Author:Kumar, A; Roy, SK; Burger, H; Majumdar, JDDate:2014The present study concerns an in-depth investigation of the influence of laser surface cladding of Ti-6Al-4V on the microstructure (both the top surface, cross-section and interface), wear resistance, corrosion resistance and bio-activity of ...Read more