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Browsing by Subject "Metallurgy"

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85 dBA: is it protective enough to prevent hearing loss in South African miners?

Author: Edwards, A Date: Sep 2009 The Occupational Exposure Limit (OEL) for noise is legislated to be 85 dBA. However, owing to the energy of different frequencies the effect on the ear by sounds of different frequencies is known to vary. Also, there is recent evidence of the ... Read more
Additive manufacturing: Characterization of TI-6AI-4V alloy intended for biomedical application

Author: Ramosoeu, ME ; Chikwanda, HK ; Bolokang, AS ; Booysen, G ; Ngonda, TN Date: Oct 2010 Direct Metal Laser Sintering (DMLS) is one of the new Laser Additive Manufacturing (LAM) techniques used for producing complex topology components mostly found in medical applications. The work presented in this paper focuses on metallographic ... Read more
Characteristic effects of alloying elements on ß solidifying titanium aluminides: A review

Author: Raji, Sadiq Abiola ; Popoola, API ; Pityana, Sisa L ; Popoola, OM Date: Jul 2020 The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied ... Read more
Clean coal technology: gasification of South African coals - IFSA 2008

Author: Engelbrecht, AD ; North, Brian C ; Hadley, TD Date: Nov 2008 Electricity demand in South Africa is increasing at a rate of 1000 MW per year. Whilst there is increasing pressure to adopt non-fossil fuel electricity generating technologies, the abundant reserves and low cost of coal make it the preferred ... Read more
The comparative study of the microstructural and corrosion behaviour of laser-deposited high entropy alloys

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S ; Aramide, O Date: Jun 2021 Corrosion is a conservational occurrence that has a large economic impact on most metals and its alloys because it destroys and deteriorates most materials by an electrochemical process through the reaction of these materials with the ... Read more
Corrosion fatigue performance in simulated sea water of aluminium 6061-T651 welded using ER4043 filler wire

Author: Mutombo, K ; Du Toit, M Date: Oct 2010 The fatigue life of Al6061-T651 for various applied stress amplitudes in the unwelded and welded conditions was significantly lower in 3.5% NaCl simulated sea water solution, compared to that in air. The damage ratio increased with a decrease ... Read more
Design of Merensky Reef crush pillars

Author: Watson, BP ; Kuijpers, JS ; Stacey, TR Date: Oct 2010 The Bushveld platinum group metal deposits are two distinct, shallow-dipping stratiform tabular orebodies which strike for many hundreds of kilometres. Mining is extensive, with depths ranging from close-to-surface to 2 300 m. The mining ... Read more
Determination of inclusions in liquid steel after calcium treatment

Author: Tshilombo, K Date: Feb 2010 Nozzle blocking was eliminated by calcium-treated liquid steel through changing the chemical and phase composition of alumina inclusions in aluminium-killed steel. Three different methods were applied to determine the composition of inclusions ... Read more
Effect of process control agent (PCA) on the characteristics of mechanically alloyed Ti-Mg powders [Conference paper]

Author: Machio, Christopher N ; Chikwanda, HK ; Chikosha, S Date: Oct 2010 This article reports results of a study to determine the effect of process control agent (PCA) on the characteristics of Ti-Mg powders during milling. It has been shown that a 2% increase in PCA content leads to up to a 40% increase in yield ... Read more
Effect of process control agent (PCA) on the characteristics of mechanically alloyed Ti-Mg powders [Journal article]

Author: Machio, Christopher N ; Chikwanda, HK ; Chikosha, S Date: Mar 2011 This paper reports the results of a study to determine the effect of process control agent (PCA) on the characteristics of Ti-Mg powders during milling. It has been shown that a 2% increase in PCA content leads to up to a 40% increase in yield ... Read more
In search of low cost titanium: the fray farthing chen (FFC) cambridge process

Author: Oosthuizen, SJ Date: Mar 2011 This article explores the Fray Farthing Chen (FFC) Cambridge process, a novel method for the electrochemical deoxidation of metal oxides in molten salt, discovered at the University of Cambridge in 1997. The process was hailed as a highly ... Read more
In situ measurements of Merensky pillar behaviour at Impala Platinum

Author: Watson, BP ; Kuijpers, J ; Miovsky, P Date: Dec 2009 The Bushveld platinum group metal deposits in South Africa are the largest in the world. These deposits occur as two distinct stratiform tabular ore bodies and strike for many hundreds of kilometres. Mining is extensive, with depths ranging ... Read more
Influence of Mn on the tensile properties of SSM-HPDC Al-Cu-Mg-Ag alloy A201

Author: Müller, H ; Masuku, EP ; Curle, UA ; Pistorius, PC ; Knutsen, RD ; Govender, G Date: Mar 2011 A201 aluminium alloy is a high strength casting alloy with a nominal composition of Al-4.6Cu-0.3Mg-0.6Ag. It is strengthened by the O(Al2Cu) phase and the ’(Al2Cu) phase during heat treatment. Further strengthening of this alloy system can ... Read more
Investigations into the residual strength of a 2.5 m wide Bushveld Merensky Reef crush pillar

Author: Watson, BP ; Mosomane, SM ; Kuijpers, JS ; Roberts, David P Date: Aug 2008 The first crush pillars on the Bushveld platinum mines were introduced at Union Section in 1978. Before the introduction of crush pillars, serious problems were experienced when stoping advanced to a point 30 m to 40 m on both sides of the ... Read more
Japanese-South African collaboration to mitigate seismic risks in deep gold mines

Author: Ogasawara, H ; Durrheim, RJ ; Nakatani, M ; Yabe, Y ; Milev, A ; Cichowicz, A ; Kawakata, H ; Moriya, H ; JST-JICA SA research group Date: Sep 2009 Mining-induced seismicity poses a hazard to workers in deep South African mines, while natural earthquakes pose a hazard to people living in Japan and other regions of the world that are close to plate boundaries. Researchers introduce a ... Read more
Leading the next boom? competitive Eastern limb platinum supply

Author: McGill, JE Date: Jul 2010 Primary production of PGE globally is geographically restricted to South Africa—bushveld Complex (77%); Russia—Noril’sk and alluvial producers (13%); and collectively USA—Stillwater; Zimbabwe—Great Dyke; and Canada—Lac de Iles (10%). Seventy-seven ... Read more
Magnesium: origin and role in calcium-treated inclusions

Author: Pistorius, PC ; Presoly, P ; Tshilombo, G Date: Aug 2009 Steel was sampled after calcium treatment at an industrial steel plant, and the inclusions identified by energy-dispersive X-ray microanalysis (EDX) on polished sections of the samples analysing the samples in a scanning electron microscope. ... Read more
Magnesium: Origin and role in calcium-treated inclusions

Author: Pistorius, CP ; Presoly, P ; Tshilombo, KG Date: Aug 2006 Calcium treatment of alumina inclusions, to convert the alumina to molten or partially molten calcium aluminates, is a well-established treatment for steel, to improve the castability of aluminium-killed steel. However, the role of magnesium ... Read more
Meeting the milestones: are South African small-to-medium-scale mines up to the task?

Author: Dekker, JJ ; Edwards, AL ; Franz, RM ; Van Dyk, T ; Banyini, A Date: May 2011 Controlling noise has proven difficult in mining, and noise-induced hearing loss (NIHL) remains common. In 2008, a South African Mine Health and Safety Council study focused on small- to medium-sized mines in relation to the milestones set ... Read more
Merensky pillar strength formulae based on back-analysis of pillar failures at Impala Platinum

Author: Watson, BP ; Ryder, JA ; Kataka, MO ; Kuijpers, JS ; Leteane, FP Date: Aug 2008 The Bushveld platinum group metal deposits are two distinct, shallow-dipping stratiform tabular orebodies and strike for many hundreds of kilometres. Mining is extensive, with depths ranging from close-to-surface to 2 000 m. The mining method ... Read more

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