Interface Chemical Modification for Property Control of Oxide Reinforced Ceramic Matrix Composites
Final rept. 1 Mar 1995-30 Apr 1998
PENNSYLVANIA UNIV PHILADELPHIA BOARD OF TRUSTEES
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The Air Force requirements for high temperature structural materials include applications in aircraft afterburner and in propulsion systems. Ceramic matrix composites are candidate materials systems for several types of these applications. In the effort to develop composites for high temperature structural applications attention has turned towards oxide-oxide systems. The objective of this project is to systematically investigate the segregation behavior and high temperature stability of complex oxides. The project has an experimental and a theoretical component. The approach combines Auger electron spectroscopy AES, Rutherford backscattering spectrometry RBS and scanning probe microscopies STM, AFM, along with conventional transmission and scanning electron microscopies TEM,SEM to characterize surface and interface composition. The theoretical approach emphasizes a coherent model of segregation that connects statistical mechanics and first principles calculations. This work is in collaboration with the R. Kerans and the Ceramics Group at Wright Patterson Air Force Base.
- Ceramics, Refractories and Glass