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Browsing by Author "Machio, Christopher N"

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Analysis of the cold compaction behaviour of TiH2-316L nanocomposite powder blend using compaction models

Author: Machio, Christopher N ; Machaka, Ronald ; Shabalala, T ; Chikwanda, HK Date: Jul 2015 The paper captures the effect of structure and the applicability of compaction models using the cold compaction of a TiH2-SS316L composite powder prepared by high energy mechanical milling. The composite blend was cold pressed uniaxially to ... Read more
Characterization of mechanically alloyed f.c.c. Ti–Mg–based powders

Author: Machio, Christopher N ; Nyabadza, D ; Sibanda, V ; Chikwanda, HK Date: May 2010 Face centred cubic Ti – 10 and 20 Mg and Ti-6Al-4Mg (wt. %) alloy powders have been produced by high energy ball milling, under argon, of elemental powder mixtures containing a process control agent (PCA). Milling leads to a multi-disperse ... Read more
Consolidation of titanium hydride powders during the production of titanium PM parts: The effect of die wall lubricants

Author: Machio, Christopher N ; Machaka, Ronald ; Chikwanda, HK Date: Nov 2015 The effects of die wall lubricants on the cold compaction of titanium hydride powder are studied. Three commonly-used die wall powder metallurgy lubricants – zinc stearate, Acrawax® C dispersion and Mirror Glaze® – are compared. The influence ... Read more
Corrosion behaviour of WC-VC-Co hardmetals in acidic media

Author: Konadu, DS ; Van der Merwe, J ; Potgieter, JH ; Potgieter-Vermaak, S ; Machio, Christopher N Date: Sep 2010 The effect of increasing vanadium carbide (VC) content on the corrosion behaviour of tungsten carbide – 10 wt% cobalt hard metals was investigated in 1 M hydrochloric (HCl), and sulphuric (H2SO4) acids solutions. Increasing VC content makes ... Read more
Corrosion of WC-VC-Co hardmetal in neutral chloride containing media

Author: Machio, Christopher N ; Konadu, DS ; Potgieter, JH ; Potgieter-Vermaak, S ; Van der Merwe, J Date: Jan 2013 Corrosion is an important surface degradation process in some, if not all, applications of tungsten-carbide-(WC-) cobalt- (Co-) based hardmetals. Applications like tools for machining of metals and for wear resistance in the mining industry ... 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
The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti50Pt50 alloy

Author: Motsai, Tebogo ; Makhatha, E ; Camagu, Sigqibo ; Machio, Christopher N ; Daswa, Pfarelo ; Radingoana, Precious ; Motsi, Glenda Date: Nov 2022 Significant research has been done to produce shape memory alloys that have good shape memory properties and high martensitic transformation temperatures. The Ti50Pt50 alloys have been found to have high transformation temperature of around ... Read more
Mechanical alloying and sitering of TI - 10WT.% MG powders

Author: Machio, Christopher N ; Nyabadza, D ; Chikwanda, HK ; Phasha, M ; Sibanda, VM Date: Jun 2009 A Ti-10wt.%Mg powder alloy has been produced by mechanical alloying. Elemental powders of Ti and Mg were ball milled in a Zoz-Simoloyer CM01 for 16 and 20 hours under argon. Mechanical alloying was followed by XRD, SEM and particle size ... Read more
Microstructures and thermal behaviour of Ti31.75V18.25Pt50 and Ti25V25Pt50 potential shape memory alloys

Author: Motsai, Tebogo M ; Makhatha, ME ; Camagu, Sigqibo T ; Machio, Christopher N ; Daswa, Pfarelo ; Radingoana, Precious M ; Motsi, Glenda T Date: Nov 2022 The binary Ti50Pt50 alloy exhibits high transformation temperatures (1050°C) and has gained a great deal of attention due to its potential for high temperature applications in the automotive and aerospace industries. However, this binary ... Read more
Modelling and optimization of surface roughness during AISI P20 milling process using Taguchi method

Author: Tlhabadira, I ; Daniyan, IA ; Machaka, Ronald ; Machio, Christopher N ; Masu, L ; VanStaden, LR Date: Jun 2019 Surface roughness Ra is a parameter normally used to indicate the level of surface irregularities during machining operations. This work aims to model the cutting process, correlate and optimise the critical process parameters using the Taguchi ... Read more
Phase transformations during sintering of mechanically alloyed TiPt

Author: Nxumalo, S ; Chikwanda, HK ; Machio, Christopher N Date: Oct 2010 A TiPt alloy was produced by mechanically alloying the desired quantities of titanium and platinum. The resultant TiPt alloy powder was cold pressed to produce green bodies. Several sintering conditions were used to sinter this alloy. It was ... Read more
Separation of DR synthesized Ti-Mg Alloy by dissolution of waste by-products in acid media

Author: Mushove, T ; Chikwanda, HK ; Ndlovu, S ; Machio, Christopher N Date: Jun 2010 The objective of this work is to isolate synthesized Ti-Mg alloy powder through leaching out of MgO and any unreduced oxides of Titanium. Leaching media investigated are H2SO4, HCl and organic acids ascorbic acid/oxalic and L-cysteine /ascorbic ... Read more
Separation of DR synthesized Ti-Mg Alloy by dissolution of waste by-products in acid media

Author: Mushove, T ; Chikwanda, HK ; Ndlovu, S ; Machio, Christopher N Date: Jun 2010 The objective of this work is to isolate synthesized Ti-Mg alloy powder through leaching out of MgO and any unreduced oxides of Titanium. Leaching media investigated are H2SO4, HCl and organic acids ascorbic acid/oxalic and L-cysteine /ascorbic ... Read more
Ti-Mg alloy powder synthesis via mechanochemical reduction of TiO2 by elemental magnesium

Author: Mushove, T ; Chikwanda, HK ; Machio, Christopher N ; Ndlovu, S Date: Apr 2009 This paper reports the preliminary results of an investigation on the synthesis of a Ti-Mg alloy powder through mechanochemical processing of TiO2 and Mg powders. TiO2 was mixed with elemental Mg according to a nominal stoichiometric composition ... Read more
Ti-Pt Alloys form mechanical milling

Author: Nxumalo, S ; Chikwanda, HK ; Machio, Christopher N Date: Dec 2009 The high temperature ß-TiPt phase has been shown to undergo a martensitic transformation upon quenching to room temperature. The martensitic transformation results from a transformation of the parent B2 cubic structure to the martensitic B19 ... Read more
Use of equimolar cysteine/ascorbic acids to recover MCP synthesized Ti(Mg) alloy

Author: Mushove, T ; Chikwanda, HK ; Machio, Christopher N ; Ndlovu, S Date: Oct 2010 Dissolution of waste by-products of mechanochemical processing (MCP) synthesis of Ti(Mg) alloy, from TiO2 and 15 wt.% excess Mg, was conducted in equimolar cysteine/ascorbic acids. The synthesized alloy is inherently mixed with MgO and other ... Read more

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