Suppressing H2 evolution by silicon powder dispersions

dc.contributor.authorTichapondwa, Shepherd Masimba
dc.contributor.authorFocke, Walter Wilhelm
dc.contributor.authorDel Fabbro, Olinto
dc.contributor.authorMkhize, Sfiso S.
dc.contributor.authorMuller, E.
dc.contributor.emailwalter.focke@up.ac.zaen_US
dc.date.accessioned2012-05-25T08:01:22Z
dc.date.available2012-05-25T08:01:22Z
dc.date.issued2011-07
dc.description.abstractSilicon 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 of surface modifications and medium pH on the rate of corrosion of silicon was studied at ambient temperature. It was found that the rate of hydrogen evolution increased with increasing pH. Silanes proved to be more effective silicon corrosion inhibitors than alcohols, with vinyl tris (2-methoxyethoxy) silane producing the best results. Differential thermal analysis (DTA) studies were performed using a near-stoichiometric amount of lead chromate as oxidant. Comparable combustion behavior was observed when both the fuel and the oxidant powders were either uncoated or silane modified. Mixtures of neat oxidant with silane-coated silicon showed poor burn behavior and this was attributed to poor particle–particle mixing due to the mismatch in surface energies.en_US
dc.description.librarianai2012en
dc.description.sponsorshipThe THRIP programme of the Department of Trade and Industry and the National Research Foundation as well as AELen_US
dc.description.urihttp://tandfonline.com/loi/uegm20en_US
dc.identifier.citationTichapondwa, SM, Focke, WW, Del Fabbro, O, Mkhize, S & Muller, E 2011, 'Suppressing H2 evolution by silicon powder dispersions', Journal of Energetic Materials, vol 29, no. 4, pp. 326-343.en_US
dc.identifier.issn0737-0652 (print)
dc.identifier.issn1545-8822 (online)
dc.identifier.other10.1080/07370652.2010.529100
dc.identifier.urihttp://hdl.handle.net/2263/18887
dc.language.isoenen_US
dc.publisherTaylor & Francisen_US
dc.rights© Taylor & Francis Group, LLC. This is an electronic version of an article published in Journal of Energetic Materials, vol. 29, no. 4, pp. 326-343, July 2011. Journal of Energetic Materials is available online at: http://tandfonline.com/loi/uegm20.en_US
dc.subjectOxidationen_US
dc.subjectSiliconen_US
dc.subject.lcshSilicon -- Oxidationen
dc.subject.lcshHydrogenen
dc.subject.lcshOxidizing agentsen
dc.titleSuppressing H2 evolution by silicon powder dispersionsen_US
dc.typePostprint Articleen_US

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