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
Author:Seleka, TS; Pityana, Sisa LDate:Nov 2006Laser surface melting has been conducted on a 304 stainless steel (SS) with the aim of enhancing pitting corrosion resistance of the material. This process involves rapid melting of the material’s surface followed by rapid solidification to ...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:Van Rooyen, CorneyDate:Nov 2009This presentation looks at the experimental procedure and results of laser welding of maraging steel rocker motor casing. It concludes that a fracture occurred in weld metal of autogenous welding and that a fracture occurred in base material ...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
Author:Baloyi, NM; Pityana, Sisa L; Tlotleng, Monnamme; Meacock, C; Popoola, PDate:Dec 2012Laser coating is an advanced coating technology used for improving the surface properties of metal components. The coatings produced are thick, dense, and crack-free with continuous non-porous microstructures having uniform composition which ...Read more
Author:Tlotleng, Monnamme; Sukla, M; Akinlabi, E; Pityana, Sisa LDate:Aug 2013This research work seeks to establish titanium alloys (Ti-6Al-4V), in the field of tissue engineering, as material of interest for bone replacement with a particular focus on hip implants replacement. The aim of this study was to produce a ...Read more
Author:Kumar, S; Pityana, Sisa LDate:Nov 2010For making metallic products through Additive Manufacturing (AM) processes, laser-based systems play very significant roles. Laser-based processes such as Selective Laser Melting (SLM) and Laser Engineered Net Shaping (LENS) are dominating ...Read more
Author:Anochie-Boateng, Joseph; Komba, Julius J; O'Connell, Johannes SDate:Jul 2011There are concerns about the standard methods/procedures for quantifying shape properties of rock aggregates used in road and airfield pavements. The CSIR has recently acquired a portable three-dimensional (3D) laser scanning device to address ...Read more