Browsing by Keyword "Silicon carbide"
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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 Thermophysical and radiative properties of pressureless sintered SiC and ZrB2-SiC laminates(2018-09) Padovano, Elisa; Badini, Claudio; Mergia, Konstantina; Barcena, Jorge; EXTREMATThe evaluation of thermal and radiative properties of materials to be used as a hot part of thermal protection systems is a key issue for the design process of the HTC and UHTC components. Ceramic laminates with composition 100 vol%SiC and 80 vol%ZrB2-20 vol%SiC were prepared by the tape casting technique and pressureless sintered. Thermal properties such as the thermal expansion coefficient, specific heat, thermal diffusivity and conductivity were measured; in addition the total emissivity was evaluated. A comparison of the thermal behavior of these two kinds of laminates is made. Moreover their possible integration in a unique structure is discussed.