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CHEMICAL EROSION BEHAVIOR OF GRAPHITE DUE TO ENERGETIC OXYGEN IMPACT

机译:活性氧冲击对石墨的化学侵蚀行为

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Pyrolytic graphite, fine grain graphite and amorphous a-C:H films were irradiated with energetic oxygen in the energy range 1-5 keV between room temperature and 1800 K. CO and CO2 molecules released during implantation were analyzed by residual and line-of-sight mass spectroscopy and their velocity distributions were determined by time-of-flight measurements. The retained oxygen was determined by thermal desorption spectroscopy after irradiation. The impact of energetic oxygen (E > 1 keV) on these materials results in the formation of CO and CO2 with an erosion yield close to unity. The observed CO release behavior can be described by a local saturation model. Special experiments indicate that the underlying release mechanism is driven by ion-induced collision processes at the end of the ion trajectory of the impinging oxygen. Time-of-flight measurements have shown that released CO molecules have two different energy distributions with a thermal component corresponding to the target temperature and an overthermal component at a maximum energy of about 0.12 eV, whereas the CO2 molecules are exclusively released with thermal energies. (C) 1997 Elsevier Science B.V. [References: 20]
机译:在室温至1800 K之间的能量范围为1-5 keV的高能氧下,对热解石墨,细晶粒石墨和非晶aC:H薄膜进行辐照。通过残留和视线质量分析了植入过程中释放的CO和CO2分子光谱学和它们的速度分布是通过飞行时间测量来确定的。照射后通过热解吸光谱法测定保留的氧。高能氧(E> 1 keV)对这些材料的影响导致形成了CO和CO2,其腐蚀收率接近于1。观察到的CO释放行为可以通过局部饱和模型来描述。特殊实验表明,潜在的释放机理是由撞击氧气的离子轨迹末端的离子诱导的碰撞过程驱动的。飞行时间测量结果表明,释放出的CO分子具有两种不同的能量分布,其热成分对应于目标温度,而过热成分的最大能量约为0.12 eV,而CO2分子仅以热能释放。 (C)1997 Elsevier Science B.V. [参考:20]

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