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Silane modified Cr2O3/polyimide nanocomposite films with excellent surface insulation performance for space
Wenrui Li1, Xiong Yang1, Changchun Qi1
1State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Nanotechnology
|August 18, 2024
Summary
This study enhances polyimide (PI) spacecraft insulation using chromium oxide (Cr2O3) nanoparticles. Modified PI films show improved vacuum surface insulation, crucial for preventing deep space mission failures.
Area of Science:
- Materials Science
- Aerospace Engineering
- Electrical Engineering
Background:
- Space exploration demands robust spacecraft insulation against electrostatic discharge.
- Polyimide (PI) is a key external insulation material, but its vacuum performance needs enhancement.
Purpose of the Study:
- To improve the vacuum surface insulation properties of polyimide films.
- To investigate the effect of Cr2O3 nanoparticles modified with KH550 on PI insulation.
Main Methods:
- Grafting KH550 silane coupling agent onto Cr2O3 nanoparticles.
- Doping and modifying polyimide films with the treated Cr2O3 nanoparticles.
- Evaluating the vacuum surface flashover voltage, resistivity, and dielectric properties of composite films.
Main Results:
- PI-Cr2O3@KH550 composite films showed significantly enhanced vacuum surface flashover voltage and improved resistivity.
- A 0.8% mass fraction of Cr2O3@KH550 resulted in a 20.7% increase in DC flashover voltage and a 27.8% increase in impulse flashover voltage.
- Doping introduced deep traps, inhibiting charge migration and reducing surface resistivity for better insulation.
Conclusions:
- KH550-modified Cr2O3 nanoparticles effectively enhance PI vacuum surface insulation.
- The composite films offer superior performance for aerospace applications.
- This modification strategy is valuable for improving spacecraft insulation reliability.
