Ceramic-matrix composites are powerful, difficult, environmentally good, gentle in weight, and feature the facility to resist excessive working temperatures. those features lead them to plausible candidate fabrics for prime temperature structural functions. Twenty 3 are integrated during this quantity describing the most recent advancements within the components of ceramic fibers, processing and fabrication, oxide and non-oxide composites, carbon-carbon composites, geopolymer composites, mechanical habit, corrosion and environmental results, characterization, fiber-matrix interface, layout of composites, and thermal/environmental barrier coatings.Content:
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Additional info for Advances in Ceramic Matrix Composites IX, Volume 153
Each mosaic grain consists of several alumina rich mullite grains which are slightly mutually misoriented and encloses spherical and elongated particles of a-alumina of respectively 50nm in diameter and lOOnm in length . The elongated particles show some preferential alignment with respect to the fiber axis and their long facets correspond to the basal plane of a-alumina. Fig. 16 : Nextel 720 fiber a) as received , b)after creep at T=1400°C, cr=80MPa, tR=14h, £R=52%. Fiber axis arrowhead. After heat treatment, from 1300°C, the microstructure evolves towards facetted mullite (3Al203:2Si02) grains deprived of intragranular alumina particles together 22 Advances in Ceramic Matrix Composites IX with larger a-alumina particles which become intergranular42'43.
Further investigations, including Na/LiCl corrosion tests, will be necessary to assess the specific action of alkali species on high temperature corrosion mechanisms. ACKNOWLEDGEMENTS The authors wish to thank De. Baron for developing the SCM-based peak fitting software. Dr G. Gouadec is acknowledged for many fruitful discussions. REFERENCES 'Ph. Mazerolles, "Nanocomposites in mullite-Zr02 and Mullite-Ti02 systems synthesized through alkoxide hydrolysis gel routes", J. Mater. Sei. 26 3503-10 (1991).
M. S. Yu. I. A. K. Strukova, " Microstructure and Properties of AI2O3AI5Y3O12 Fibers Produced by an Internal Crystallization Route," Composite Science and Technology, 59 1763-1772 (1999). l. Chani, A. Yoshikawa, Y. Kuwano, K Hasegawa and T. Fukuda, "Growth of Y3AlsOi2-Nd Fiber Crystals by Micro-pulling Down Technique", Journal of Crystal Growth, 204 155-162 (1999). l. Chani, A. Yoshikawa, Y. Kuwano, K Inaba, K. Omoto and T. Fukuda, "Preparation and Characterization of Yb:Y3Al50i2 Fiber Crystals, " Materials Research Bulletin, 35 1615-1624 (2000).
Advances in Ceramic Matrix Composites IX, Volume 153