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Radiation-Induced Lubricant Degradation Pathways in Spacecraft Tribosystems Quiz

Posted on April 20, 2026 by

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Question 1 of 7
1. Question
Which pair of processes most directly compete in radiation-driven degradation of PFPE lubricants?
Oxidation and corrosion
Plasticization and crystallization
Chain scission and crosslinking
Hydrolysis and polymerization
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Question 2 of 7
2. Question
Heavy ions are particularly damaging to lubricants because they have high values of which parameter?
Linear energy transfer
Thermal conductivity
Coefficient of expansion
Electrical resistivity
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Question 3 of 7
3. Question
Under radiation, PFPE greases commonly show which rheological change over dose?
Decreasing yield stress with increased oil bleed
Unchanged yield stress and constant oil bleed
Rising yield stress with reduced oil bleed
Random oscillation of yield stress with constant bleed
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Question 4 of 7
4. Question
Which observation most clearly indicates radiation damage distinct from thermal oxidation in vacuum tested PFPEs?
Increase in polar oxygenated species from peroxides
Rapid water uptake and swelling of films
Formation of brittle glassy residues and fluorocarbon volatiles
Soft gummy deposits that shear easily
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Question 5 of 7
5. Question
What post-irradiation technique reveals whether scission or crosslinking dominated in a liquid lubricant?
Ultrasonic thickness gauging
Optical profilometry
Eddy current conductivity
Gel permeation chromatography
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Question 6 of 7
6. Question
In irradiated MoS2 coatings, which microstructural change most contributes to embrittlement and friction increase?
Sulfur vacancy formation and partial amorphization
Formation of liquid-like surface layers
Complete graphitization of the film
Grain growth into large platelets
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Question 7 of 7
7. Question
Which modeling element links radiation dose to chemical conversion in lubricant life prediction?
Bond dissociation energy of water
Poisson ratio of the substrate
Surface roughness average Ra
Radiation chemical yields G values
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