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000051697 084__ $$2WoS$$aMaterials Science, Coatings & Films
000051697 1001_ $$0P:(DE-Juel1)VDB23896$$aLatzel, S.$$b0$$uFZJ
000051697 245__ $$aNew environmental barrier coating system on carbon-fiber reinforced silicon carbide composites
000051697 260__ $$aBoston, Mass.$$bSpringer$$c2005
000051697 300__ $$a268 - 272
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000051697 440_0 $$012482$$aJournal of Thermal Spray Technology$$v14$$x1059-9630$$y2
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000051697 520__ $$aCarbon-fiber-reinforced silicon carbide composites (C/SiC) are promising materials for high-temperature, light weight structural components. However, a protective coating and environmental barrier coating (EBC) are necessary to prevent the oxidation of the carbon and the reaction of the formed silica scale with water vapor. Current EBC systems use multiple layers, each serving unique requirements. However, any mismatch in the coefficients of thermal expansion (CTE) creates internal stresses and might lead to crack formation. In this case, oxygen and water vapor penetrate through the EBC, reducing the lifetime of the component. Mullite (Al6Si2O13) is used in many known EBC systems on silicon-based ceramics either as an EBC itself or as a bondcoat. Due to its low CTE and its sufficient thermal cycling behavior, mullite was chosen in this investigation as a first layer. As mullite suffers loss of SiO2 when exposed to water vapor at high temperatures, an additional protective top coat is needed to complete the EBC system. Different oxides were evaluated to serve as top coat, especially high-temperature oxides with low coefficients of thermal expansion (LCTE). An EBC containing mullite as bondcoat and the LCTE oxide La2Hf2O7 as a top coat is proposed. Both layers were applied via atmospheric plasma spraying. In this paper, results of the influence of processing conditions on the microstructure of single mullite and LCTE oxide layers as well as mullite/LCTE oxide systems are presented. Special emphasis was directed toward the crystallinity of the mullite layer and, in the top layer, toward low porosity and reduced crack density.
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000051697 650_7 $$2WoSType$$aJ
000051697 65320 $$2Author$$aatmospheric plasma spraying
000051697 65320 $$2Author$$aC/SiC
000051697 65320 $$2Author$$aceramic oxide coating
000051697 65320 $$2Author$$acoefficient of thermal expansion
000051697 65320 $$2Author$$aenvironmental barrier coating
000051697 65320 $$2Author$$amullite
000051697 65320 $$2Author$$apyrochlore oxide
000051697 7001_ $$0P:(DE-Juel1)129670$$aVaßen, R.$$b1$$uFZJ
000051697 7001_ $$0P:(DE-Juel1)129666$$aStöver, D.$$b2$$uFZJ
000051697 773__ $$0PERI:(DE-600)2047715-6$$a10.1361/10599630523854$$gVol. 14, p. 268 - 272$$p268 - 272$$q14<268 - 272$$tJournal of thermal spray technology$$v14$$x1059-9630$$y2005
000051697 8567_ $$uhttp://dx.doi.org/10.1361/10599630523854
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000051697 9141_ $$aNachtrag$$y2005
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