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“Chemically Bonded Ceramic Matrix Composites: Densification and Conversion to Diffusion Bonding”

Published online by Cambridge University Press:  15 February 2011

Bradley R. Johnson,
Mehmet A. Gülgün and
Waltraud M. Kriven
Bradley R. Johnson
Affiliation:
University of Illinois, Department of Materials Science and Engineering, 105 S. Goodwin Ave, Urbana, IL 6180 1, USA
Mehmet A. Gülgün
Affiliation:
University of Illinois, Department of Materials Science and Engineering, 105 S. Goodwin Ave, Urbana, IL 6180 1, USA
Waltraud M. Kriven
Affiliation:
University of Illinois, Department of Materials Science and Engineering, 105 S. Goodwin Ave, Urbana, IL 6180 1, USA
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Abstract

Chemically bonded ceramics appear to be a promising alternative route for near-net shape fabrication of multi-phase ceramic matrix composites (CMC's). The hydraulic (and refractory) properties of fine mono-calcium aluminate (CaAl2O4) powders were used as the chemically bonding matrix phase, while calcia stabilized zirconia powders were the second phase material. Samples containing up to 70 wt% (55 vol%) zirconia have been successfully compacted and sintered.

Various processing techniques were evaluated. Processing was optimized based on material properties, dilatometry and simultaneous thermal analysis (DTA'TGA ). The physical characteristics of this novel CMC were characterized by hardness, density, and fracture toughness testing. Microstructures were evaluated by SEM and phase identification was verified using XRD.

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