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GAS-PHASE REACTION IN NANOALUMINUM COMBUSTION

机译：纳米铝燃烧中的气相反应

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The presence or absence of gas phase species during combustion of aluminum nanoparticles (n-Al) is a crucial observable in evaluating competing theories such as a diffusive oxidation mechanism and the melt dispersion mechanism. Absorption spectroscopy was used to probe the ground state of aluminum monoxide (AlO) and Al vapor in order to quantify the amount of Al and AlO present under conditions where these species were not observed in emission previously. Absorption measurements were made during combustion ofnanoalumi-num and micron-sized aluminum in a heterogeneous shock tube. AlO was detected in absorption at temperatures as low as 2000 K in n-Al combustion, slightly below the limit seen in micro-Al combustion. Al vapor was detected during n-Al combustion at temperatures as low as 1500 A, significantly lower than in micro-Al combustion, suggestive of a gas phase component. The detection limit for Al vapor was 1 ×10~(12) cm~(-3) . The gas phase component was much weaker than that seen in 10 fan Al combustion. A comparison with n-Al in an inert environment did not show Al vapor at temperatures below 2300 K, even though the equilibrium concentration of Al from particles at that temperature were several orders of magnitude higher than the detection limit. This suggests a nearly pristine oxide coat that inhibits the production of Al vapor in appreciable quantities without reaction. These results are contrary to predictions of the melt dispersion mechanism, which should result in the generation of aluminum vapor from high-energy Al clusters produced from n-Al particles that spallate from mechanical stresses under rapid heating. This should further be independent of the bath gas.
机译：在评估铝纳米颗粒（n-Al）燃烧过程中气相物种的存在与否是评估竞争理论（例如扩散氧化机制和熔体分散机制）的关键观察因素。吸收光谱法用于探测一氧化铝（AlO）和Al蒸气的基态，以便量化在以前在发射中未观察到这些物种的条件下存在的Al和AlO的量。在异质激波管中燃烧纳米铝和微米级铝的过程中进行了吸收测量。在n-Al燃烧中在低至2000 K的温度下检测到吸收中的AlO，略低于微Al燃烧中看到的极限。在低至1500 A的温度下进行n-Al燃烧时检测到Al蒸气，这明显低于微Al燃烧时的温度，这表明存在气相成分。 Al蒸气的检出限为1×10〜（12）cm〜（-3）。气相成分比10扇Al燃烧中所见的弱得多。在惰性环境中与n-Al的比较在2300 K以下的温度下没有显示Al蒸气，即使该温度下来自颗粒的Al平衡浓度比检测极限高几个数量级。这表明几乎纯净的氧化物涂层可以抑制相当数量的Al蒸气产生而不会发生反应。这些结果与熔体分散机理的预测相反，该预测应导致由高能Al团簇产生铝蒸气，该高能Al团簇由n-Al颗粒产生，在快速加热下由于机械应力而散裂。这应该进一步独立于浴气。

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