1. Department of Mechanical Engineering, Dedan Kimathi University of Technology, Private Bag 10143, Dedan Kimathi, Nyeri 10143, Kenya
2. Department of Mining, Materials and Petroleum Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi P.O. Box 6200-00200, Kenya
3. School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, Private Bag 3, Johannesburg 2050, South Africa
4. DSI-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa