Author:Esser, DDate:Oct 2012In this presentation the development path of new solid-state laser technology, which is taken from the underlying laser physics to challenging real world applications, is shown.Read more
Author:Van Rooyen, Corney; Theron, Maritha; Burger, HPDate:Sep 2011This presentation highlights the case for refurbishment/performance enhancement of industrial components in South Africa. There is potential to improve operational efficiency and reduce operating cost provided that techno-economically viable ...Read more
Author:Labuschagne, K; Pityana, Sisa LDate:Jul 2005In view of the importance of material degradation during laser irradiation, which can have deleterious effects on mechanical and chemical properties of a component, a study was initiated to determine a threshold at which damage takes place ...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:Mahamood, RM; Akinlabi, ET; Shukla, M; Pityana, Sisa LDate:Mar 2013The effect of laser power on the resulting microstructure and microhardness of laser metal deposited Ti6Al4V powder on Ti6Al4V substrate has been investigated. The tracks were deposited using 99.6 % pure Ti6Al4V powder of particle size ranging ...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:Popoola, AP; Pityana, Sisa LDate:Oct 2010The present work deals with the development of Aluminium metal matrix composite (MMC) using TiB2 reinforcement. The aim is to improve the microhardness property of the substrate. The surface of the aluminium was sand blasted to improve its ...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:Chakraborty, A; Pityana, Sisa L; Dutta Majumdar, JDate:Jan 2017The present investigation aims at improving the wear resistance of AISI 304 stainless steel by laser surface alloying of AISI 304 stainless steel with WC+Co+NiCr (in the weight ratio of 20:40:40). Laser surface alloying was carried out by ...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
Author:Pityana, Sisa L; Baloyi, N; Tlotleng, Monnamme; Popoola, PDate:Apr 2019The advantages of using Nb and Ti-Nb coatings for improving the hardness and corrosion resistance of Ti6Al4V were investigated. It has been reported that Ti6Al4V used in orthopaedic implants tends to release toxic Al and V ions into the ...Read more