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Browsing by Author "Masina, Bathusile N"

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An all optical system for studying temperature induced changes in diamond

Author: Masina, Bathusile N ; Forbes, A Date: 2010 Industrial diamonds are heated by a laser beam and the resulting temperature is optically measured on the surface of the diamond. The ultimate aim is that with the heating and temperature known and measurements being repeatable, the ... Read more
An all optical system for studying temperature induced changes in polycrystalline diamond deposited on a tungsten carbide substrate

Author: Masina, Bathusile N ; Forbes, A ; Bodkin, R ; Mwakikunga, Bonex W Date: Sep 2010 In this poster the authors discussed the ability to heat an industrial diamond sample by means of optical absorption of a CO2 laser beam, and then measure the resulting temperature on the surface of the diamond optically by means of radiometry ... Read more
An all-optical system designed for the heating and temperature measurement of the diamond tool

Author: Masina, Bathusile N ; Forbes, A ; Bodkin, R ; Mwakikunga, Bonex W Date: Jul 2012 Diamond tools are used in industry for abrasive applications such as grinding, and drilling. One of its important applications is in drill bits used for drilling through rock in search of oil. The early failure of drill bits used in oil ... Read more
Blue- and red-shifts of V2O5 phonons in NH3 environment by in situ Raman spectroscopy

Author: Akande, Amos A ; Machatine, AGJ ; Masina, Bathusile N ; Chimowa, G ; Matsoso, B ; Roro, Kittessa T ; Duvenhage, M-M ; Swart, H ; Bandyopadhyay, J ; Ray, Suprakas S ; Mwakikunga, Bonex W Date: Jan 2018 A layer of ~30 nm V2O5/100 nm-SiO2 on Si was employed in the in situ Raman spectroscopy in the presence of NH3 effluent from a thermal decomposition of ammonium acetate salt with the salt heated at 100 °C. When the layer is placed at 25 °C, ... Read more
Characteristics of laser In-situ alloyed titanium aluminides coatings

Author: Tlotleng, Monnamme ; Masina, Bathusile N ; Pityana, Sisa L Date: Jan 2017 The use of titanium aluminides as high temperature materials in the aerospace and automobile industries is becoming a reality since their early research and development in 1955. Their mechanical properties at elevated temperatures make them ... Read more
The control of magnetism near metal-to-insulator transitions of VO2 nano-belts

Author: Nkosi, SS ; Lafane, S ; Masina, Bathusile N ; Ndwandwe, OM Date: Dec 2016 The magnetic properties of paramagnetic/weakly ferromagnetic films are strongly affected by the proximity to materials that undergo a metal to insulator phase transition. Here, we show that under the deposition conditions associated with ... Read more
Diffusion of Co and W in diamond tool induced by 10.6 µm CO2 laser radiation

Author: Masina, Bathusile N ; Forbes, Andrew ; Mwakikunga, Bonex W ; Bodkin, R Date: May 2011 At present it is known that diamond tools degrade with time as it is normally used at high temperatures. One of the questions the authors like to answer in this study is whether thermally induced problems in diamond tool arise as a result of ... Read more
Effect of heat treatment on microstructure, hardness and tensile properties of high-speed selective laser melted Ti6Al4V

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Annan, K ; Maledi, N ; Masina, Bathusile N Date: Nov 2022 This study presents the investigation of the influence of heat treatment on microstructure, hardness and tensile properties of high-speed selective laser melted Ti6Al4V components. Heat treatment was performed to obtain an improved microstructure ... Read more
Effect of heat treatment temperature on the microstructure and microhardness of TiC/Ti6Al4V composite manufactured with laser metal deposition

Author: Kgoahla, Reneilwe M ; Lekoadi, Paul M ; Masina, Bathusile N Date: Nov 2023 This study presented the investigation of the influence of post heat treatment temperature on the microstructure and hardness of TiC/Ti6Al4V composite manufactured with laser metal deposition. Heat treatment was performed to improve the ... Read more
Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties

Author: Masina, Bathusile N ; Skhosane, Besabakhe S ; Tlotleng, Monnamme Date: 2020 The direct laser-deposited Inconel 718 (IN718) specimens were produced using 1073 nm, high power continuous wave (CW), IPG Ytterbium fibre laser and in-situ heat treatment. The laser power and in-situ heat treatment temperature were fixed ... Read more
The effect of laser shock processing on the anti-corrosion performance of LENS-Fabricated Ti-6Al-4V alloy

Author: Arthur, Nana KK ; Kubjane, SM ; Popoola, API ; Masina, Bathusile N ; Pityana, Sisa L Date: May 2023 Titanium alloys are prone to increased oxidation rates when exposed to higher temperatures during application. As a result, the components suffer mechanical failure due to the formation of the alpha-case layer at 500 °C. To improve its corrosion ... Read more
Effect of laser wavelength in PLD in the orientation and thermochromic properties of VO2 (M1) on a glass substrate

Author: Masina, Bathusile N ; Akande, Amos A ; Mwakikunga, Bonex W Date: Dec 2019 Highly oriented VO2 (M1) thin films are difficult to produce using non-crystalline substrates. For example, to produce such films on glass has required post-annealing or the use of a ZnO transparent layer. Here, we overcome this challenge and ... Read more
Effect of LSP parameters on the corrosion and hardness properties of TI6Al4V

Author: Kubjane, SM ; Arthur, Nana KK ; Masina, Bathusile N ; Popoola, API ; Pityana, Sisa L Date: Sep 2019 Because of its low density, high corrosion resistance and high strength to weight ratio, titanium and its alloys are widely used in aerospace applications. As a result, the material is exposed to detrimental environment. An enhancement in ... Read more
Effects of energy density on the microstructure evolution of TiC/Ti6Al4V-ELI metal composite fabricated with laser metal deposition

Author: Ramasobane, P ; Mashinini, MP ; Masina, Bathusile N Date: Nov 2022 This study investigated the microstructural evolution of Ti6Al4V-ELI reinforced with TiC, fabricated via in-situ laser metal deposition technique. The 3.85% volume fraction TiC/Ti6Al4V-ELI metal composite samples were fabricated at two different ... Read more
Effects of substrate heating on the microstructure and hardness of TiB/Ti6Al4V-ELI during laser in-situ metal deposition

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Dec 2021 This work investigated the influence of heating temperature (°C) on the microstructure and microhardness of TiB/Ti6Al4V-ELI composite clads that were produced via in-situ alloying using laser metal deposition technique. The samples were ... Read more
Evaluation of heat treatment parameters on microstructure and hardness properties of high-speed selective laser melted Ti6Al4V

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Annan, K ; Maledi, N ; Masina, Bathusile N Date: Feb 2021 This study presents the investigation on how heat treatment parameters, which are temperature, cooling method, and residence time, influence the microstructural and hardness properties of Ti6Al4V components produced on Ti6Al4V substrate using ... Read more
Fast imaging of laser induced plasma emission of vanadium dioxide (VO2) target

Author: Masina, Bathusile N ; Lafane, S ; Wu, Lorinda ; Kerdja, T ; Abdelli-Messaci, S ; Forbes, A Date: Oct 2013 The main objective of this study is to fully optimise the synthesis of vanadium oxide nanostructures using pulsed laser deposition. We will attempt to realise this by studying the mechanism of the plasma formation and expansion during the ... Read more
Improving the microstructure of high speed selective laser melted Ti6A14V components by varying residence time during heat treatment

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Maledi, N ; Masina, Bathusile N Date: Nov 2019 Selective laser melting (SLM) is a powder bed additive manufacturing technique that produces components layerby-layer from computer aided designs as opposed to conventional manufacturing methods. Although this manufacturing technique offers ... Read more
In-situ production of WC-Ni using a laser cladding technique

Author: Skhosane, Besabakhe S ; Masina, Bathusile N ; Lekoadi, Paul M ; Pityane, Sisa L Date: Nov 2022 Metal Matrix Composite (MMC) coatings of Tungsten Carbide (WC) and Nickel (Ni) powder were produced using laser cladding process. A crack free and good metallurgically bonded WC-Ni coating of about 5mm thick produced from varying both laser ... Read more
In-situ synthesis of TiC/Ti-6Al-4V-ELI composite by laser

Author: Ramasobane, P ; Mashinini, PM ; Masina, Bathusile N Date: Oct 2021 Titanium-based alloys are reported to offer up to 50% strength to weight ratio. These lands titanium-based alloys as a preferred material over steel and nickel-base super-alloys, where strength and stiffness are required. Regardless titanium-based ... Read more

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