The effects of low earth orbit atomic oxygen on the properties of Polytetrafluoroethylene

Hooshangi, Zhila; Feghhi, S.A.H.; Saeedzadeh, Rezgar

doi:10.1016/j.actaastro.2015.11.031

Cited by 22 publications

(7 citation statements)

References 18 publications

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“…Diamond-like carbon (DLC) thin films have been extensively studied for this purpose, due to their appropriate tribological characteristics, such as a stable and low wear rate 8 . However, the use of DLC films for these aerospace applications faces a technical barrier, since they are severely etched by atomic oxygen present in the low orbit atmosphere (200 to 700 km), resulting in a significant lifetime reduction [9][10][11] . Methods to increase the lifetime of the DLC film include incorporation of dielectric and metallic nanoparticles 12,13 .…”

Section: Introductionmentioning

confidence: 99%

SiOx Top Layer on DLC Films for Atomic Oxygen and Ozone Corrosion Protection in Aerospace Applications

et al. 2021

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Every year, billions of dollars are invested in research and development for space applications, including new systems, new technologies, and new materials. DLC (Diamond-Like Carbon) is a promising material for use in these applications, but its use faces a technological barrier, since it is severely etched by atomic oxygen and ozone. In this study, SiOx-DLC thin films were deposited as a top layer of diamond-like carbon (DLC) films on Ti-6Al-4V substrates to increase resistance against corrosion by atomic oxygen and ozone as well as meet the requirements for use in Low Earth Orbit (LEO) satellites. The corrosion resistance of the films was evaluated using oxygen plasma, and the tribological and mechanical properties were investigated. The SiOx-DLC top layer reduced the corrosion rate two orders of magnitude and increased the critical load from 16.2 ± 1.5 N to 18.4 ± 0.4 N.

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Section: Introductionmentioning

confidence: 99%

SiOx Top Layer on DLC Films for Atomic Oxygen and Ozone Corrosion Protection in Aerospace Applications

et al. 2021

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“…[5][6][7] Although the AO density is very low in LEO, high incident fluxes of 5-eV oxygen atoms can be generated due to the orbital velocity 8 km/s. The attack of AO on spacecraft surfaces with such high kinetic energies can initiate numerous chemical and physical events, [8][9][10] which is one of the most critical factors that cause space materials degradation. Therefore, it is of paramount importance to evaluate AO effects on space materials.…”

Section: Introductionmentioning

confidence: 99%

The structure and resistance characteristic of reduced graphene oxide paper under atomic oxygen exposure

Jiang

Zhang²,

et al. 2020

Surface & Interface Analysis

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To study the effects of low earth orbit (LEO) environment on film surface structure and resistance characteristics, reduced graphene oxide paper (rGOP) was irradiated by atomic oxygen (AO) in ground‐based simulation facility. A rough pits surface, chemical oxidation, and change in lamina thickness were found after AO exposure. The erosion yield under AO attack changed from 3.56 × 10−25 to 4.04 × 10−25 cm3/atom. The resistance data exhibited a linear relationship between R0/R and AO fluence, and the maximum AO detect fluence reached to 5 × 1019 atom/cm3 when rGOP thickness was 0.8 μm, which implies that greater thickness is expected to improve space service life of rGOP.

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“…Therefore, it is crucial to investigate the LEO environmental AO effects of materials to find the proper materials for long lifetime spacecrafts. Many related researches had been carried out, and some experiments have been conducted using ground-based AO simulation equipment or in-flight tests (Banks et al, 2004; Hooshangi et al, 2016; Lv et al, 2015; Minton et al, 2012; Srinivasan and Banks, 1990; Zhao et al, 2015). Banks et al (2004) investigated some samples exposed in LEO environment, and the results indicated that the polymers commonly used in spacecraft usually exhibit a serious AO oxidization.…”

Section: Introductionmentioning

confidence: 99%

“…Minton et al incorporated polyhedral oligomeric silsesquioxane (POSS) into the polyimide matrix to prevent the AO erosion, they did laboratory and space-flight experiments, and the results showed that the POSS polyimides are highly resistant to AO attack, with erosion yields that may be as little as 1% those of Kapton directly exposed to AO (Minton et al, 2012). Additionally, Hooshangi et al studied the effects of AO on the properties of polytetrafluoroethylene films; they characterized the appearance, mass, thermal, and mechanical properties of the films (Hooshangi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effects of atomic oxygen on epoxy-based shape memory polymer in low earth orbit

Qiao

Liu

et al. 2017

Journal of Intelligent Material Systems and Structures

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Atomic oxygen is a dominant component of the low earth orbit and can erode most spacecraft polymeric material. In this article, the atomic oxygen erosion resistance tests of an epoxy-based shape memory polymer are carried out in a ground-based atomic oxygen simulator with a vacuum space chamber. The samples, before and after the atomic oxygen exposure, are compared in appearance, surface morphology, mass, main component, dynamical and static mechanical properties, and shape memory properties. The atomic oxygen exposure causes oxidization reaction of the material, which leads to surface roughen and mass loss, while the shape memory polymer main components remain same. The results of dynamical and static mechanical tests indicate that the atomic oxygen exposure has little effect on the storage modulus and glassy transition temperature (Tg), whereas the elongation, elastic modulus, tensile strength, and yield strength decrease since the atomic oxygen exposure gives rise to tiny cracks. The shape memory property has rarely changed since the atomic oxygen erosion is mainly located near the surface of the sample.

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The effects of low earth orbit atomic oxygen on the properties of Polytetrafluoroethylene

Cited by 22 publications

References 18 publications

SiOx Top Layer on DLC Films for Atomic Oxygen and Ozone Corrosion Protection in Aerospace Applications

SiOx Top Layer on DLC Films for Atomic Oxygen and Ozone Corrosion Protection in Aerospace Applications

The structure and resistance characteristic of reduced graphene oxide paper under atomic oxygen exposure

Effects of atomic oxygen on epoxy-based shape memory polymer in low earth orbit

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