Advanced thermal control technologies for future space science missions at JPL
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temperature control applications↗
Engineering topics
O'Donnell, Timothy P.
Publications and source records attributed to O'Donnell, Timothy P..
Temporally And Thermally Stable Iron/Nickel Alloy
Specially prepared version of commerical low-thermal-expansion iron/nickel alloy exhibits unprecedented thermal and temporal dimensional stability. Consists of high-purity powder-metallurgy process followed by heat treatment. High-purity processing imparts unusual combination of properties.
Sokolowski, Witold M.↗
Electrically Conductive White Thermal-Control Paint
Report describes development of white thermal-control paint intended for use on spacecraft. Paint required to exhibit combination of high emittance (equal to or greater than 0.90), low absorptance (equal to or less than 0.20), and electrical conductivity sufficient to prevent charging with static electricity to potentials beyond range of plus or minus 10 V.
Hsieh, Cheng-Hsien↗
Characterization of the dimensional stability of advanced metallic materials using an optical test bench structure
The dimensional stability of low-density high specific-strength metal-matrix composites (including 30 vol pct SiC(p)/SXA 24-T6 Al, 25 vol pct SiC(p)/6061-T6 Al, 40 vol pct graphite P100 fiber/6061 Al, 50 vol pct graphite P100 fiber/6061 Al, and 40 vol pct P100 graphite fiber/AZ91D Mg composites) and an Al-Li-Mg metal alloy was evaluated using a specially designed five-strut optical test bench structure. The structure had 30 thermocouple locations, one retroreflector, one linear interferometer multilayer insulation, and various strip heaters. It was placed in a 10 exp -7 torr capability vacuum chamber with a laser head positioned at a window port, and a laser interferometer system for collecting dimensional change data. It was found that composite materials have greater 40-C temporal dimensional stability than the AL-Li-Mg alloy. Aluminum-based composites demonstrated better 40-C temporal stability than Mg-based composites.
Hsieh, Cheng↗