Browsing Chemical Engineering by Author "Del Fabbro, Olinto"

Browsing Chemical Engineering by Author "Del Fabbro, Olinto"

Sort by: Order: Results:

  • Calcium sulfate as a possible oxidant in “green” siliconbased pyrotechnic time delay compositions 
    Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Del Fabbro, Olinto; Kelly, Cheryl (Wiley, 2015-08)
    Chemical time delay detonators are used to control blasting operations in mines and quarries. Slow burning Si-BaSO4 pyrotechnic delay compositions are employed for long time delays. However, soluble barium compounds may ...
  • A comparative study of Si-BaSO4 and Si-CaSO4 pyrotechnic time-delay compositions 
    Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Gisby, John; Del Fabbro, Olinto; Kelly, Cheryl (Taylor and Francis, 2016-07)
    Slow burning Si-BaSO4 pyrotechnic delay compositions are employed commercially for intermediate to long time delays. However, there is very little information on this composition available in open literature. The reactivity ...
  • The effect of additives on the burning rate of silicon-calcium sulfate pyrotechnic delay compositions 
    Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Del Fabbro, Olinto; Labuschagne, George (Wiley, 2016-08)
    The effect of fuel particle size as well as the influence of inert and reactive additives on the burning rate of the Si-CaSO4 composition was evaluated. The burning rate decreased with increase in fuel particle size, while ...
  • The effect of Si-Bi2O3 on the ignition of the Al-CuO thermite 
    Ilunga, K.; Del Fabbro, Olinto; Yapi, L.; Focke, Walter Wilhelm (Elsevier, 2011-01)
    The ignition temperature of the Al–CuO thermite was measured using DTA at a scan rate of 50 °C min−1 in a nitrogen atmosphere. Thermite reactions are difficult to start as they require very high temperatures for ignition, e.g. ...
  • EVA nanocomposites based on South African Koppies clay 
    Massinga, Pedro Horacio; Focke, Walter Wilhelm; Del Fabbro, Olinto; Radusch, Hans-Joachim (Wiley, 2014-09)
    South African Koppies bentonite was organo-modified with single tail and double tail alkyl ammonium cationic surfactants with the latter intercalated both below and above the clay CEC. Corresponding poly(ethylene-co-vi ...
  • Facile synthesis of copper antimonite 
    Focke, Walter Wilhelm; Mkhize, Sfiso S.; Storey, Rowan; Del Fabbro, Olinto; Muller, Elmar (Taylor & Francis, 2014-02)
    Copper antimonite, CuSb2O4, is a candidate oxidant for use in time delays for mining detonators. A facile process for the synthesis of copper antimonite comprises the reaction of antimony trioxide with copper-ammonia ...
  • Fluoroelastomer pyrotechnic time delay compositions 
    Potgieter, Gerard; Focke, Walter Wilhelm; Del Fabbro, Olinto; Labuschagné, G.D.; Kelly, C. (Springer, 2016-12)
    The feasibility of aluminium- or magnalium-filled fluoropolymer Viton B as an open-burn time delay was investigated. Film samples with a thickness of 245 ± 21 lm were prepared via a slurry casting process. Fuel filler ...
  • Manganese as fuel in slow-burning pyrotechnic time delay compositions 
    Swanepoel, Darren; Del Fabbro, Olinto; Focke, Walter Wilhelm; Conradie, Corrie (Wiley, 2010-03)
    Manganese metal was evaluated as a fuel for slow-burning delay compositions press-filled in aluminium or compaction-rolled in lead tubes. Oxides of antimony, bismuth, copper, manganese and vanadium were considered as ...
  • Mn+Sb2O3 thermite/intermetallic delay compositions 
    Montgomery, Yolandi C.; Focke, Walter Wilhelm; Atanasova, Maria T.; Del Fabbro, Olinto; Kelly, Cheryl (Wiley, 2016-10)
    The binary Mn + Sb2O3 pyrotechnic composition was investigated for mining detonator time delay applications. EKVI thermodynamic modelling predicted two maxima in the adiabatic reaction temperature. The local maximum, at ...
  • Suppressing H2 evolution by silicon powder dispersions 
    Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Del Fabbro, Olinto; Mkhize, Sfiso S.; Muller, E. (Taylor & Francis, 2011-07)
    Silicon dispersions in water are used to produce pyrotechnic time delay compositions. The propensity of the silicon to react with water and to produce hazardous hydrogen gas must be suppressed. To this end, the effect ...
  • Suppressing hydrogen evolution by aqueous silicon powder dispersions by controlled silicon surface oxidation 
    Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Del Fabbro, Olinto; Muller, Elmar (Wiley, 2013-01)
    Aqueous silicon dispersions are used to produce pyrotechnic time delay compositions. The propensity of silicon to react with water and to produce hazardous hydrogen gas must be suppressed. To this end, the effect of air ...