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
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
Author:Majumdar, JD; Kumar, A; Pityana, Sisa L; Manna, IDate:Sep 2018Implants made of AISI 316L stainless steel enjoy promising position because of their higher strength as compared to polymer based materials, and higher toughness as compared to the ceramic based implant. However, AISI 316L based implants often ...Read more
Author:Erinosho, MF; Akinlabi, ET; Pityana, Sisa L; Owolabi, GDate:Jun 2017To modify the properties of Ti6Al4V alloy, Cu has been added to host an antimicrobial effect in the revised alloy for marine application. The Laser Metal Deposition (LMD) process on the Ti6Al4V alloy and Cu was been investigated for surface ...Read more
Author:Loveday, Philip W; Long, Craig SDate:Nov 2014The ability to measure the individual modes of propagation is very beneficial during the development of guided wave ultrasound based rail monitoring systems. Scanning laser vibrometers can measure the displacement at a number of measurement ...Read more
Author:Akhter, R; Ivanchev, L; Van Rooyen, Corney; Kazadi, BP; Burger, HPDate:2006Samples of aluminium alloy A356 were manufactured by Semi Solid Metals HPDC technology, developed recently in CSIR, Pretoria. They were butt welded in as cast conditions using as Nd: YAG laser. The best metal and weld microstructure were ...Read more