Destructive Evaluation of a Xenon Hollow Cathode after a 28,000 Hour Life Test
Destructive Evaluation of a Xenon Hollow Cathode after a 28,000 Hour Life Test
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28,000 小时寿命测试后氙空心阴极的破坏性评估
DOI：
10.2514/6.1998-3482
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Timothy R. Sarver
中科院分区：
文献类型：
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作者：
Timothy R. Sarver
国际空间站（ISS）等离子体接触器系统需要使用寿命至少为18，000小时的空心阴极组件（HCA）。为了证明HCA的寿命能力，进行了一系列空心阴极磨损测试，其中包括在HCA的最大电流下运行的寿命测试。该测试旨在验证空心阴极寿命能力和污染控制方案。该空心阴极在重启尝试失败之前积累了27，800小时的运行时间。随后对阴极进行破坏性分析，以确定失效机制。对阴极内部的显微镜检查确定，阴极物理几何形状发生了相对较小的变化，并且在大部分电子发射体表面上形成了已知可以限制发射过程的钨酸钡。由于插入物的最终状态与预期的电化学性质一致，因此认为空心阴极在试验条件下已达到其使用寿命终点。
International Space Station (ISS) plasma contactor system requires a hollow cathode assembly (HCA) with a lifetime of at least 18,000 hours. In order to demonstrate the lifetime capability of the HCA, a series of hollow cathode wear tests was performed which included a life test operated at the maximum current of the HCA. This test sought to verify hollow cathode lifetime capability and contamination control protocols. This hollow cathode accumulated 27,800 hours of operation before it failed during a restart attempt. The cathode was subsequently destructively analyzed in order to determine the failure mechanism. Microscopic examination of the cathode interior determined that relatively small changes in the cathode physical geometry had occurred and barium tungstates, which are known to limit the emission process, had formed over a majority of the electron emitter surface. Because the final state of the insert was consistent with expected impregnate chemistry, the hollow cathode was believed to have reached the end of its usable life under the test conditions.