Abstract
Nanoscaled reactive multilayer films are the attractive option for the synthesis of intermetallic compounds and for local joining applications. Reactive multilayers consist of alternating layers of reactants having a large negative enthalpy of mixing. For certain designs, these foils exhibit rapid exothermic reactions at high temperature. A reaction is ignited by an external energy source such as an electric spark or a mechanical load. Once ignited, reactions within foils can produce sufficient heat at a rapid rate to induce further layer intermixing via thermally induced atomic diffusion. This results in a self-propagating reaction that then envelopes the foil. Recent work igniting energetic powder mixtures has employed lasers as a means for determining the ignition temperatures and energies. Lasers provide a controllable source of energy that can be used to better quantify ignition parameters still unknown for many reactive material systems. Short-pulsed lasers, in particular, allow for controlled energy deposition into a small volume. Despite a few studies of ignition, the susceptibility of exothermic nano-scaled multilayer *国家自然科学基金项目51005055和中央高校基本科研业务费专项资金项目HIT.NSRIF.2015066资助 收到初稿日期: 2013-12-17,收到修改稿日期: 2014-05-05 作者简介:安 荣,男, 1980年生,讲师,博士 DOI: 10.11900/0412.1961.2013.00821 第937-943页 pp. 937-943
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