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SPP-FIELDS Thermal Path to TRL 6. M. Diaz- Aguado. Material Characterization at High Temperatures. Outgassing studies (tested at NASA Glenn) Small (4%) mass losses observed at 1600 °C, higher than expected temperatures for three closest perihelion passes Thermal distortion (tested at SRI)

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Spp fields thermal path to trl 6

SPP-FIELDSThermal Path to TRL 6

M. Diaz-Aguado

Material characterization at high temperatures
Material Characterization at High Temperatures

  • Outgassing studies (tested at NASA Glenn)

    • Small (4%) mass losses observed at 1600°C, higher than expected temperatures for three closest perihelion passes

  • Thermal distortion (tested at SRI)

    • Less than .06” on a 16” tube – total alignment error budget is 2° for which 0.77° is allocated for thermal distortion (measured was 0.2°)

    • Future testing (8/2013) at VPE to check thermal distortion longer test article

  • Electrical resistance (tested at APL, SRI)

    • Sapphire, alumina and Nb C103 (1e-4 Ωcm)

  • Thermal conductivity (tested Odeillo, PROMES chamber)

    • Tested with model at temperature with alumina

  • Total hemispherical optical properties (tested Odeillo & APL)

    • BOL/EOL solar absportivity/emissivity at temperature of Nb C103 (a/e=1.8) @Odeillo

    • BOL/EOL solar absportivity/emissivity, Nb C103 @APL

Thermal model and model verification
Thermal Model and Model Verification

  • Thermal design studies of shield configuration

    • Shapes, layers

  • Thermal Test Model (TTM - 1,2 tested Odeillo)

    • Verified thermal design at high temperatures (~1000°C - 1500°C)

    • Issues with silver coated bolts and titanium parts

    • Testing at VPE to ensure Titanium behaves as expected w/o silver coating on bolts (7/2013)

  • Thermal test model (TTM – 3, test at Harvard SAO)

    • Shield shape test and other updates (9/2013), up to 1000°C with 2 light sources

  • Test margins

    • Maximum temperature from modeling is 1500°C

    • Currently using a/e of Nb C103 of 2.1, measured a/e=1.8 (translates to 100°C margin)

  • Post TRL-6 Testing (TTM- 3, test at Harvard SAO)

    • Shield shape test and high temperature conductance (date?) with 6 light sources

Absorptivity vs emissivty ni c103
Absorptivity vs. Emissivty Ni C103

  • CNES, Solar Furnace Odeillo

  • APL

E field antenna development
E-Field Antenna Development

  • Niobium sheet and tube stock required for development

    • Candidate flight material

  • Tantalum-Tungsten (Ta-W) sheet and tube in stock

    • Back up candidate material

  • Thermal Modeling updates

    • Change heat shield design to lower max temperature and maintain max preamp temp < 70°C (chevron shape)

    • Added shield and thermal isolation to hinge and preamp

  • Material Thermal Testing

    • C103 and Ta-W do not have mass loss issue

    • Testing of TML < TBD%, CVCM <TBD% (in previous missions TML<1%, CVCM<0.1%)

    • High temperature optical properties testing

    • Verified other high temperature properties, e.g. thermal conductivity, resistance

  • Design

    • Replaced fluid hinge damper with mechanical damper that is more temperature tolerant

    • Hinge will be cycled and tested (reminder that hinge will deploy once to a locking position before getting close to Sun)

Thermal choke ttm
Thermal Choke TTM

Whip Disk

Whip Choke


Water Cooling

Thermal shield ttm
Thermal Shield TTM




Water Cooled


Choke t hermal balance
Choke Thermal Balance



Ttm shield lessons learned
TTM Shield Lessons Learned

  • Re-crystalization of Titanium

    • Has no observed effect on bracket

  • Melting of silver coating on bolts

    • Might create gaps on joints

  • Rapid heating

    • Probably deformed shield

Antenna tube deflection
Antenna Tube Deflection

  • Below are the measurements in inches that were made in Photoshop based on the images captured at the tip of these three tubes at 1400 °C, for 40 min.

  • C103 Tube1:

    • Pre to mid 0.040

  • C103 Tube2:

    • Pre to final 0.060

    • Pre to mid 0.056

    • mid to final 0.004

  • TaW Tube 2:

    • Pre to final 0.021

    • Pre to mid 0.012

    • mid to final 0.009