| Issue |
J. Phys. IV France
Volume 09, Number PR8, September 1999
Proceedings of the Twelfth European Conference on Chemical Vapour Deposition
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| Page(s) | Pr8-1049 - Pr8-1056 | |
| DOI | https://doi.org/10.1051/jp4:19998131 | |
J. Phys. IV France 09 (1999) Pr8-1049-Pr8-1056
DOI: 10.1051/jp4:19998131
CVD-produced ZrO2- and C/ZrO2-fiber coatings for mullite/mullite composites
K. Nubian1, B. Saruhan2, H. Schneider2 and G. Wahl11 Technische Universität Braunschweig, Institut für Oberflächentechnik, 38108 Braunschweig, Germany
2 German Aerospace Center, Institute of Material Research, 51147 Köln, Germany
Abstract
The outstanding thermal-mechanical properties make mullite fiber/mullite matrix composites a favorite candidate for high temperature applications, e.g. in turbines. In order to realize crack deflection and fiber pull-out, a coating of the mullite fibers is necessary to obtain a weak bonding between fibers and matrix. ZrO2 coatings were produced by a CVD-process using Zr(acac)4 as precursor. The substrates were Nextel 720 fiber fabrics, which were in some experiments precoated with carbon. The diffusion into the fiber bundle was described. Composites were fabricated by infiltration of coated fibers with a pre-mullite slurry and hot-pressing at < 1300°C. Experiments have shown that C/ZrO2 double layers yield favorable thermo-mechanical properties, while porous ZrO2 single layers did not.
© EDP Sciences 1999