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Failure Analysis of a Qualification Unit Injector for a Satellite Thruster

机译：用于卫星推进器的资格单元注射器的故障分析

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This paper details the results of a failure analysis performed on a Qualification Unit injector for a military satellite thruster. The failure was initially detected due to a shift in performance during qualification testing. Visual examination of the injector face revealed a significant loss of material in the vicinity of an oxidizer orifice as shown in Figure 1. The injector was manufactured by Aerojet's proprietary platelet process using CRES 347 material. Injectors of similar configuration have been manufactured of the same alloy and operated on other programs for a number of years. Non-destructive evaluation (NDE) was performed on the injector using micro-focus X-ray and scanning electron microscopy (SEM). Serial cross-sectional metallography was then performed, with each cross-section documented by optical microscopy and SEM. Multiple SEM inspections were also performed on a "Test Unit" injector at different operating intervals and on un-fired production injectors.
机译：本文详细说明了对军事卫星推进器的资格分析进行了故障分析的结果。由于在资格测试期间的性能转变，最初检测到故障。喷射器面的视觉检查显示氧化剂孔附近的显着损失，如图1所示。通过使用CRES 347材料通过Aerojet的专有血小板工艺制造注射器。类似配置的喷射器已经由相同的合金制造，并在其他程序上运行多年。使用微聚焦X射线和扫描电子显微镜（SEM）对喷射器进行非破坏性评估（NDE）。然后进行串联横截面金相术，通过光学显微镜和SEM记录的每个横截面。在不同的操作间隔和未烧制的生产喷射器上也对“测试单元”注射器进行多次SEM检查。

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