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@ARTICLE{Latzel:51697,
      author       = {Latzel, S. and Vaßen, R. and Stöver, D.},
      title        = {{N}ew environmental barrier coating system on carbon-fiber
                      reinforced silicon carbide composites},
      journal      = {Journal of thermal spray technology},
      volume       = {14},
      issn         = {1059-9630},
      address      = {Boston, Mass.},
      publisher    = {Springer},
      reportid     = {PreJuSER-51697},
      pages        = {268 - 272},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Carbon-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.},
      keywords     = {J (WoSType)},
      cin          = {IWV-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)VDB5},
      pnm          = {Brennstoffzelle / Werkstoffsysteme für Kraftwerke},
      pid          = {G:(DE-Juel1)FUEK246 / G:(DE-Juel1)FUEK248},
      shelfmark    = {Materials Science, Coatings $\&$ Films},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000229564700047},
      doi          = {10.1361/10599630523854},
      url          = {https://juser.fz-juelich.de/record/51697},
}