Selection of a PVD Black Coating for the Thermal Control of the Feedthroughs and Door Mechanisms in the SOLAR ORBITER Heat Shield

Date

2018-07-08

Journal Title

Journal ISSN

Volume Title

Publisher

48th International Conference on Environmental Systems

Abstract

The ESA Solar Orbiter is an interdisciplinary mission to the Sun. It consists of a single spacecraft which will orbit the Sun in a moderately elliptical orbit, using a suite of advanced Remote-Sensing and In-Situ instruments to perform a detailed observation of the Sun and surrounding space. SENER is contractor for the design and delivery of the FDMs subsystem (Feedthroughs, Door & Mechanisms), which consists on several through wall filters and six mechanism doors to protect the instruments in some operational conditions, all of them located in the Heat Shield of the satellite. The extreme environment which the FDMs will be subject to during the Mission, involves a challenge for the thermal design of the subsystem, mainly based on the passive thermal control, where the selected external surface finish plays a decisive role in the thermal behavior.

This paper briefly explains the trade-off performed for the selection of the coating of the FDMs during the initial phases of the project. This selection was tightly constrained by demanding requirements for operational temperatures (above 500ºC), cleanliness close to optical instruments, electrical resistivity and coating strength for AIT purposes. The finally selected coating is a special developed coating called ASTRO BLACK® based on the PVD technology. The coating has been submitted to a qualification test campaign whose results are also presented in the paper, together with the thermal analyses used for the design of the FDMs. Due to the good results achieved at analysis level, and during the tests performed throughout the project, SENER has considered the use of ASTRO BLACK® in other subsystems of the same mission which is responsible for, and also in other missions with highly demanding thermal environments.

Description

Cristina Borque, SENER INGENIERIA Y SISTEMAS
Isabel Soto, SENER INGENIERIA Y SISTEMAS
Jose Javier Viñals, SENER INGENIERIA Y SISTEMAS
ICES202: Satellite, Payload, and Instrument Thermal Control
The 48th International Conference on Environmental Systems was held in Albuquerque, New Mexico, USA on 08 July 2018 through 12 July 2018.

Keywords

PVD coating, High temperature, Mechanism, SENER, Astro Black, Solar orbiter, Feedthrough, Qualification Test Campaign, Correlation, Thermal Balance Test, Emissivity, Absorptance

Citation