Bio

Publications


2014

ODERA, BO, Papo MJ, Rading GO, Cornish LA.  2014.  Experimental solidification projection, liquidus surface projection and isothermal section at 1000°C for the Pt-Cr-V system.. Journal of Phase Equilibria and Diffusion. DOI: 10.1007/s11669-014-0321-y

2013

ODERA, BO, Cornish LA, Papo MJ, Rading GO.  2013.  A preliminary study of higher order platinum-based alloys for high temperature applications, October 2013. Proceedings of Precious Metals 2013 Conference, the Precious Metals Development Network, Advanced Metals Initiative. , Southern Africa Institute of Mining and Metallurgy
Odera, BO.  2013.  Addition of vanadium and niobium to platinum-based alloys . Abstract

The ternary systems, Pt-Al-V at the Pt-rich corner and Pt-Cr-V were investigated. Phase equilibria data were obtained using scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffraction analyses. The alloys were studied in the as-cast condition, as well as after annealing at 1000°C for 1500 h. Solidification projections were constructed and liquidus surface projections derived for the two systems. Isothermal sections at 1000°C were also determined for the two systems. Two ternary phases were found in the Pt-Al-V system and one in the Pt-Cr-V system. It was concluded that all the phase regions were identified correctly since the results were self-consistent. Four invariant reactions were identified in the Pt-Cr-V system. Four Pt-Al-Cr-Ru-V and two Pt-Al-Cr-Ru-V-Nb alloys were also investigated and data obtained using scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffraction analyses. The alloys were studied in the as-cast condition, as well as after annealing at 1000°C for 1500 h. The compositions of the alloys were based on a quaternary alloy, Pt82:Al12:Cr4:Ru2, which had been identified as one of the alloys having optimum properties in an earlier investigation. Four of the as-cast alloys had a two-phase structure of ~Pt3Al and (Pt), while two had a single phase, ~Pt3Al. Vanadium partitioned more to ~Pt3Al compared to (Pt). There was an improvement in hardness compared to the quaternary alloys which had been identified as having optimum properties. About 64% of as-cast Pt-Al-V alloys had Vickers hardnesses higher than 500 HV0.3 while ~70% of the annealed alloys had hardness higher than 500 HV0.3. More than 60% of both as-cast and annealed Pt-Cr-V alloys had hardness values higher than 600 HV0.3. There was a general increase in hardness after annealing Pt-Cr-V alloys. Hardness increased with V content in the higher order alloys, and also the annealed alloys had higher hardness compared to the as-cast ones.

2012

Cornish, LA, Shongwe MB, Odera B, Odusote JK, Witcomb MJ, Chown LH, Rading GO, Papo MJ.  2012.  Update on the development of platinum-based alloys for potential high-temperature applications. , SEPT.18-21 2012 . Proceedings of Southern African Institute of Mining and Metallurgy, Platinum 2012 Conference. , Sun City, South Africa
ODERA, BO, Cornish LA, Papo MJ, Rading GO.  2012.  Microstructural investigation of some as-cast alloys of the Pt-Cr-V system, OCT. 2012. Proceedings of the Ferrous and Base Metals Development Network Conference. , Magaliesburg, South Africa
ODERA, BO, Cornish LA, Shongwe MB, Rading GO, Papo MJ.  2012.  As-cast and heat-treated alloys of the Pt-Al-V system at the Pt-rich corner. The Journal of Southern African Institute of Mining and Metallurgy. 7A:505-515.
ODERA, BO, Cornish LA, Papo MJ, Rading GO.  2012.  Electrolytic etching of platinum-aluminium based alloys. Platinum Metals Rev. 56(4) 2012(E-ISSN 1471-0676):pp257-261.
Odera, BO, Cornish LA, Papo JM, Rading GO.  2012.  Electrolytic Etching of Platinum- Aluminium Based Alloys. AbstractWebsite

The microstructures of as-cast and annealed platinum alloys of different compositions were revealed after electrolytic etching in hydrochloric acid/sodium chloride solution using direct current. It was shown that the etching process enhances good microstructural images of platinum-aluminium based alloys.

2011

ODERA, BO, Cornish LA, Shongwe MB, Rading GO, Papo MJ.  2011.  A study of some as-cast and heat treated alloys of the Pt-Al-V system at the Pt-rich corner., OCT. 12-14. Proceedings of the ZrTa New Metals Development Network Conference at Mount Grace Country House and Spa, Magaliesburg. , The Southern African Institute of Mining and Metallurgy, Advanced Metals Initiative
ODERA, BO, Cornish LA, Rading GO, Papo MJ.  2011.  Solidification projection of the Pt-Al-V system at the Pt-rich corner, DEC. 5-9. Proceedings of the Microscopic Society of Southern Africa Conference. , Pretoria, South Africa

2010

ODERA, BO, Cornish LA, Suss R, Rading GO.  2010.  A study of as-cast alloys of the Pt-Cr-V system., OCT. 26-29. Proceedings of the Microscopic Society of Southern Africa Conference. , Warmbaths Forever Resorts, South Africa

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