Abstract
Mullite-based fiber-reinforced composites are favorite candidates for the application in combustion chambers of gas turbines. The application requires damage tolerance, temperature and oxidation-resistance at high temperatures (>1200°C) over long terms. In order to realize crack deflection and fiber pull-out, an interphase coating of the mullite fibers (Nextel 720) is necessary to obtain a weak bonding between fibers and matrix. Two systems of interphases produced by CVD were described. The first system is a carbon/metal-oxide double layer (C/ZrO 2 , C/Al 2 O 3 ). Properties of the resulting composites after heat-treatment (1300°C, 1000 h) under cyclic and continuous heating conditions were described. The second system is the codeposition of La 2 O 3 and Al 2 O 3 on the fibers. After heat-treatment at 1300°C lanthanum hexaluminate (LaAl 11 O 18 ) with a magneto plumbite structure containing sliding planes should be formed.
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