Tailoring Thin-Film/Lacquer Coatings for Space Applications

Peters, Wanda; Harris, George D.; Miller, G. M.; Petro, J.

doi:10.1088/0954-0083/12/1/308

Cited by 12 publications

(14 citation statements)

References 1 publication

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“…Other similar measurements [31,32] also measure specularity of 0.98 or higher. For this paper, the collector and secondary used 0.98, whereas the director used 0.94 in recognition of the fact that it may be more difficult to get a highly specular surface in the form of a thin metal foil.…”

Section: G Specularitymentioning

confidence: 85%

Critical Look at the Solar Photon Thruster Concept

Fieseler

Anderson

Cable

2015

Journal of Spacecraft and Rockets

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A solar photon thruster is a class of solar sail using multiple reflecting surfaces. Herein, the details of solar photon thruster design are investigated to allow comparison against more typical solar sail configurations. Many potential problems with the solar photon thruster concept have been sidestepped in the literature. Therefore, issues relevant to solar photon thruster operation were investigated, such as the following questions: 1) What are the realistic thrust levels and performance that such a vehicle might experience? 2) Do lightweight materials capable of handling the high heat fluxes, where the light is concentrated and reflected, exist? 3) How significant are the reflection losses due to having multiple reflective surfaces? 4) Can a large flexible mirror really focus the light sufficiently well to allow the solar photon thruster concept to work? It is found that any solar photon thruster will have a significantly inferior performance to a similarly sized flat solar sail. The maximum reflectivity of the surfaces typically used by solar sails and solar photon thrusters is determined; it is also found that the thermal issues of concentrating sunlight to a small focus are difficult but manageable and that using a large flexible metallized plastic surface as the main light-collecting surface, although suitable for a normal solar sail, is an extreme challenge for the solar photon thruster concept. NomenclatureA c , A s = area of collector and area of secondary, respectively, m 2 a = absorptivity B= non-Lambertian coefficients e = emissivity L = length, m M = mass, kg P in;d = power incident on the director, W P r = radiation pressure, N∕m 2 p = momentum, kg · m∕s S = spectral irradiance, W∕m 2 · μ s = specularity, unitless T = temperature, K W = solar irradiance, W∕m 2 ε r = reflective efficiency ρ c , ρ d = reflectivity σ = Stefan-Boltzmann constant, W∕m 2 · K 4 σ r = radial stress, N∕m 2

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Section: G Specularitymentioning

confidence: 85%

Critical Look at the Solar Photon Thruster Concept

Fieseler

Anderson

Cable

2015

Journal of Spacecraft and Rockets

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“…Peters et al demonstrated good results of tailoring of thin‐film/lacquer coatings for space applications where highly specular surfaces are needed. These coatings can be applied to both rough and smooth substrates.…”

Section: Recent Advancesmentioning

confidence: 99%

Coatings and Thin Films for Spacecraft Thermo‐Optical and Related Functional Applications

Hołyńska

Tighe

Semprimoschnig

2018

Adv Materials Inter

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An overview of coatings and thin films for spacecraft applications is provided, focusing on coatings for thermal control and optical applications. An outline of the requirements imposed by the harsh conditions in space is given. Space applications of coatings are listed and their qualification is described, including testing in the ESA laboratories at ESTEC. Coatings degradation in space and environmental testing, including degradation due to vacuum, thermal cycling, radiation, atomic oxygen, space debris, and outgassing effects, is covered in detail. Recent advances in the field and perspectives for future development are also reviewed based on the published literature.

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“…Traditional conductive coatings, such as metals and indium tin oxides, are sputtered or deposited as thin films onto flexible substrates such as polyimide for spacecraft applications 28–33 . Conductive metals such as copper, silver, and aluminum are used in spacecrafts, and their conductivity degrades when exposed to AO in LEO 34,35 .…”

Section: Introductionmentioning

confidence: 99%

Polyhedral oligomeric silsesquioxane polyimide nanocomposites for color filters and flexible conductive films

Qian

Zhou²,

Liu³

et al. 2020

J of Applied Polymer Sci

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Color filters and conductive films are widely used in spacecraft, while the lack of lightweight, flexibility, and atomic oxygen (AO) durability confine their potential applications in low earth orbit. In this study, a clear poly(amic acid) with an empirical 20 wt% polyhedral oligomeric silsesquioxane (POSS) solid content is designed for transparency and AO durability. Red, green, blue, and yellow dyes are reinforced with small amounts of 1–5 wt% in POSS polyimides for color filters. A silver nanowire network film is infiltrated onto the POSS polyimide for conductive film. Erosion depth upon hyperthermal AO exposure, surface morphology, surface chemistry, optical transparency, and conductivity have been systematically investigated. The erosion yields of all 20 wt% POSS polyimides decrease by an order of magnitude when subjected to 2.32 ± 0.05 and 2.39 ± 0.06 × 1020 atoms cm−2 AO fluences, as passivating SiOx networks are formed on film surface. The small‐amount dye additives into polyimides do not introduce obvious changes in AO durability and surface chemistry. The silver nanowire infiltrated POSS polyimide film shows a 65.7% transmittance at 550 nm and a sheet resistance of 8.50 ± 0.36 Ohm square−1. This study reveals promising attempts of POSS‐polyimide‐based color filters and flexible conductive films for potential space applications.

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Tailoring Thin-Film/Lacquer Coatings for Space Applications

Cited by 12 publications

References 1 publication

Critical Look at the Solar Photon Thruster Concept

Critical Look at the Solar Photon Thruster Concept

Coatings and Thin Films for Spacecraft Thermo‐Optical and Related Functional Applications

Polyhedral oligomeric silsesquioxane polyimide nanocomposites for color filters and flexible conductive films

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