Browsing by Keyword "Thermal tests"
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Item Joining of ceramic matrix composites to high temperature ceramics for thermal protection systems(2016-02-01) Jiménez, C.; Mergia, K.; Lagos, M.A.; Yialouris, P.; Agote, Iñigo; Liedtke, V.; Messoloras, S.; Panayiotatos, Y.; Padovano, E.; Badini, C.; Wilhelmi, C.; Bárcena, Jorge; EXTREMATThe current work reports a novel approach for the integration of external protective SIC multilayers with ceramic matrix composite (C-f/SiC) with the view of application in aerospace heat protection systems. The integration method is based on diffusion brazing bonding. As a joining agent the MAX-Phase Ti3SiC2, produced by self-propagating high temperature synthesis, has been employed. The pressure applied during the joining process and its effect on the microstructure of the integrated structure is discussed. Microstructural analysis of the resulting joints is conducted using scanning electron microscopy coupled with energy dispersive spectroscopy and X-ray diffraction measurements. Analysis of the joints showed that the bonds are uniform, dense, with few crack vertical to the interface which are not detrimental for the performance of the joints. Ground re-entry tests showed that the joints survive 5 re-entry cycles at 1391 and 1794 degrees C without any detectable damage. (C) 2015 Elsevier Ltd. All rights reserved.Item The thermal control of Tribolab: a materials experiment on board the International Space Station(Nova Science Publishers, Inc., 2018) Garmendia, Iñaki; Anglada, EvaTribolab is a materials tribology experiment that was flown on board the International Space Station (ISS) from February 2008 to September 2009. The main objective of the experiment was the study of the behaviour of new solid lubricants (specifically, molybdenum disulphide MoS2 alloyed with tungsten carbide WC) under real space conditions. The thermal control of the instrument (techniques needed to ensure that the temperature range of the experiment components are adequate in all the mission possible scenarios), mainly based on passive thermal control with some active components, is explained in detail in this chapter. Two computational models devised for the design, as well as the different mission scenarios, foreseen temperatures and thermal flows, are also detailed. The verification and on earth qualification tests are also described, as well as the real thermal behaviour of the experiment when on board the International Space Station. Post-flight examination of Tribolab was also possible, as the experiment returned to ground on the Space Shuttle.