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Thermal Testing on High Temperature MLI and Sunshields for Solar Probe Sun-Viewing Instruments

机译：用于太阳能探头防晒仪器的高温MLI和阳光防晒测试

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The Solar Probe science team at NASA Goddard Space Flight Center (GSFC) is considering enhance science observations by adding the nadir viewing Plasma Spectrometer instrument and using heat shields to protect the Plasma Wave Antennas to permit full extension at 3 solar radii (Rs). The main components of the thermal protection system for these nadir viewing instruments are high temperature multi-layer insulation (MLI) blankets and carbon-carbon (C-C) composite sunshields that have an aluminum oxide (AI2O3) coating on the sun facing surfaces. A thermal test on the Plasma Wave Antenna sample was performed in September 2006 using a small and specially designed vacuum chamber and a Vortek Lamp. A 12.7 cm x 12.7 cm low-cost high temperature MLI blanket was built. It consists of 15 layers of 0.01524 mm tantalum foils which are interspaced with a 0.00508 mm carbon fiber mesh. Although the MLI blanket is much thicker than that proposed in the original design, the thermal test results show that the MLI effective emittance is about the same as the 0.03 value assumed for the original design. The highest temperatures of the MLI and hot side C-C measured in the test were l,000°C and l,300°C respectively. Higher temperatures were not pursued because the chamber pressure increased as the temperature increased. The pressure increase was caused by outgassing from the test sample and thermocouple connectors. An inspection of the MLI blanket after the test revealed that it had no degradation. The AI2O3 coating on the hot side C-C was discolored, possibly by contaminants from outgassing. When the hottest hot side C-C thermocouple was 700°C or warmer, the C-C warped. The AI2O3 coating delaminated, possibly due to the C-C warping.
机译：NASA戈达德航天飞行中心（GSFC）的太阳能探测科学团队正在考虑通过添加Nadir观察等离子体光谱仪仪器来提高科学观察，并使用热屏蔽来保护等离子体波天线以允许在3个太阳能线（Rs）的完全延伸。这些Nadir观察仪器的热保护系统的主要部件是高温多层绝缘（MLI）毯子和碳 - 碳（C-C）复合遮阳板，其在太阳面上的氧化铝（Ai2O3）涂层。在2006年9月，使用小型和专门设计的真空室和VIGREK灯进行等离子体波天线样品的热试验。建造了12.7厘米x 12.7厘米的低成本高温MLI毯。它由15层的0.01524mm钽箔组成，含有0.00508mm碳纤维网。虽然MLI毯比原始设计中提出的厚度要厚得多，但热敏测试结果表明，MLI有效的可接触率大致与原始设计假设的0.03值大致相同。在测试中测量的MLI和热侧C-C的最高温度分别为L，000℃和L，300℃。由于温度升高，因此不追求较高的温度。通过从测试样品和热电偶连接器的放气引起的压力增加。测试后的MLI毯检查显示它没有降解。热侧C-C上的Ai2O3涂层变色，可能是通过除气中的污染物而变色。当最热的热侧C-C热电偶为700°C或较高时，C-C翘曲。 Ai2O3涂层分层，可能是由于C-C翘曲。

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