Author:Malgas, GF; Arendse, CJ; Cele, NP; Cummings, FRDate:Feb 2008This paper reports on the growth of carbon nanotubes (CNTs) by thermal Chemical Vapour Deposition (CVD) and investigates the effects of nitrogen carrier gas flow rates and mixture ratios on the morphology of CNTs on a silicon substrate by ...Read more
Author:Curle, UA; Wilkins, JD; Govender, GDate:2011Industrial semi-solid casting trials of aluminum A356 brake calipers were performed over five days with the CSIR-RCS and highpressure die casting process cell. Consecutive visual passed castings were used as the measure of process stability, ...Read more
Author:Motaung, DE; Malgas, GF; Arendse, CJ; Oliphant, CJ; Knoesen, DDate:Jun 2009In this report, the influence of thermal annealing of thin P3HT films and P3HT:C60 composites were studied regarding their morphology and structural properties. Atomic force microscope measurements on P3HT films and P3HT:C60 composite disclose ...Read more
Author:Malgas, GF; Arendse, CJ; Mavundla, S; Cummings, FRDate:Aug 2008Interfacial analysis of the rrP3HT samples spincoated on a glass substrate was studied in detail using transmission electron microscopy (TEM) and SEM measurements. Very homogeneous and smooth polymer (P3HT and PEDOT:PSS) layers are observed ...Read more
Author:Moller, H; Govender, G; Stumpf, WEDate:2008The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments. It is shown that a decrease ...Read more
Author:Masuku, EP; Moller, H; Knutsen, R; Ivanchev, L; Govender, GDate:Jun 2009The traditional solution treatment cycles that are currently applied to rheo-processed A201 are mostly those that are used for conventional castings. These solution treatments are not necessarily the optimum solution treatments for rheo-processing. ...Read more
Author:Damm, O; Du Preez, WDate:2009Through focused investment by the CSIR, the South African Innovation Fund, the Automotive Industry Development Centre and the Department of Science and Technology over the past eight years, the national Light Metals Development Network has ...Read more
Author:Ivanchev, L; Camagu, ST; Govender, GDate:Oct 2012There are two main technologies for manufacturing of particulate reinforced metal matrix composites (MMC), solid state and liquid state processing. The great challenge of producing cast metal matrix composites is to prevent agglomeration of ...Read more
Author:Moller, H; Govender, G; Stumpf, WDate:Apr 2009The T5 heat treatment of semi-solid metal (SSM) processed alloy F357 was investigated by considering the effects of cooling rate and natural aging after casting, as well as artificial aging parameters on tensile properties. In addition, the ...Read more
Author:Moller, H; Govender, G; Stumpf, WEDate:2008Semi-solid metal (SSM) processing is a unique manufacturing method to produce near-net shape products for various industrial applications. The aim is to obtain a semi-solid structure free of dendrites (which are formed by conventional liquid ...Read more
Author:Arendse, CJ; Malgas, G; Oliphant, CJ; Muller, TFG; Knoesen, DDate:2009The material properties of hydrogenated amorphous silicon (a-Si:H) have been known to change when exposed to elevated temperatures. In this work researchers report on the thermal stability of the optical band gap and structural disorder in ...Read more