Post-Flight Evaluation of Stardust Sample Return Capsule Forebody Heatshield Material
Post-Flight Evaluation of Stardust Sample Return Capsule Forebody Heatshield Material
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DOI：
10.2514/6.2008-1202
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发表时间：
2008-01
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影响因子：
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通讯作者：
M. Stackpoole;S. Sepka;I. Cozmuta;D. Kontinos
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文献类型：
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作者：
M. Stackpoole;S. Sepka;I. Cozmuta;D. Kontinos
酚醛浸渍碳烧蚀器(PICA)是美国宇航局艾姆斯研究中心在80年代根据轻质陶瓷烧蚀器开发计划开发的。PICA的低密度(约0.27g/cc)，加上在高热流密度下的高效烧蚀能力，使其成为星尘任务的使能技术。本文讨论了星尘样品返回舱(SRC)前体隔热罩上飞行后从关键位置提取的三个核心的评估。核心位置包括一个接近停滞的核心、一个侧翼核心和一个从隔热罩肩部取下的部分。评估包括密度分布、后退测定、热分析分布、PICA结合线检查、剩余原始PICA的强度评估、发射率分布、化学分析分布和显微结构分析。结果表明，实验密度分布与由菲亚特得到的密度分布的比较，以及由实测值和菲亚特对侧向堆芯的预测的退缩比较，都显示出很好的一致性。总体而言，在岩芯中检查的PICA材料状况良好，完好无损。冲击损伤不明显，唯一观察到的退化是由于进入时加热造成的。在所有被检查的岩芯中都存在大量的原始PICA。
Phenolic Impregnated Carbon Ablator (PICA) was developed at NASA Ames Research Center under the lightweight ceramic ablator development program in the ’80s. PICA’s low density (~ 0.27g/cc), coupled with efficient ablative capability at high heat fluxes, makes it an enabling technology for the Stardust mission. This paper discusses the evaluation of three cores extracted post flight from key locations on the forebody heatshield of the Stardust Sample Return Capsule (SRC). Core locations included a near stagnation core, a flank core, and a segment taken from the shoulder of the heatshield. Evaluation included density profiles, recession determination, a thermal analysis profile, PICA bondline examination, strength assessment of remaining virgin PICA, an emissivity profile, a chemical analysis profile, and a microstructural analysis. Results show good agreement in comparisons of experimental density profiles and profiles derived from FIAT and in recession comparisons from measured values and FIAT predictions for the flank core. In general, the PICA material examined in the cores is in good condition and intact. Impact damage is not evident, and the only degradation observed was that caused by heating on entry. A substantial amount of virgin PICA was present in all cores examined.