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IGNITION BEHAVIOR OF α-AlH_3

机译：α-AlH_3的点火行为

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An experimental investigation on the ignition behavior of α-Aluminum Hydride (α-AlH_3) has been conducted. The ignition characteristics were determined through the use of two separate modified T-jump experiments. In each experiment, a small amount of material was placed onto a platinum wire, which was heated rapidly through resistive heating. As a result both ignition and hydrogen release temperatures were studied for heating rates ranging from 10~4 to 10~5 KIs. The hydrogen release temperature was determined in vacuum, and ignition was studied at ambient pressure in air, CO_2, and mixtures of argon with oxygen. Both the hydrogen release and ignition temperature increased as the heating rate increased. Hydrogen release temperatures ranged from approximately 650 to 1200 K, whereas ignition was observed to range from below the melting temperature of aluminum (933 K) to approximately 1500K. Activation energies for hydrogen release were ～27 kJ/mol, and are well below those reported by others at much lower heating rates. This result is consistent with the affects of higher heating rates transitioning the rate-limiting step from one of chemical kinetics to intraparticle hydrogen diffusion. For conditions in which the particles would ignite it was found that the environment did not play a significant role in the ignition temperature, beyond a critical oxygen mole fraction of X_(O2) > 0.05. Ensemble average burning times were found to decrease by a factor of about 3 when the oxygen mole fraction was increased from 0.1 to 0.5.
机译：对α-氢化铝（α-AlH_3）的着火行为进行了实验研究。点火特性是通过使用两个单独的改进的T跳实验确定的。在每个实验中，将少量材料放在铂丝上，并通过电阻加热将其快速加热。结果，研究了加热速率为10〜4到10〜5 KIs的着火温度和氢气释放温度。在真空中确定氢气释放温度，并在环境压力下于空气，CO_2和氩气与氧气的混合物中研究引燃。氢的释放和着火温度都随着加热速率的增加而增加。氢释放温度在大约650至1200 K的范围内，而观察到的着火范围是在低于铝的熔化温度（933 K）至大约1500K的范围内。氢释放的活化能约为27 kJ / mol，远低于其他人报道的较低的加热速率。该结果与较高加热速率的影响一致，该加热速率将限速步骤从化学动力学之一转变为颗粒内氢扩散。对于其中颗粒将被点燃的条件，发现环境在超过X_（O2）的临界氧摩尔分数> 0.05的情况下，对着火温度没有显著作用。当氧气摩尔分数从0.1增加到0.5时，发现集合平均燃烧时间减少了大约3倍。

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