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Characterization of the Reaction Products That Develop in the Processing of Al2O3/BaZrO3Laminated Composites

Authors
Journal
Materials Characterization
1044-5803
Publisher
Elsevier
Publication Date
Volume
40
Identifiers
DOI: 10.1016/s1044-5803(98)00011-4
Disciplines
  • Chemistry

Abstract

Abstract The absence of a chemical reaction at an interface is conventionally thought to be an important criterion in producing a tough ceramic matrix composite (CMC). As a result of this criterion, interphases in CMCs were chosen on the basis of their chemical reactivity. A weak interface results in crack deflection, crack bridging, and, in fiber-reinforced ceramics, fiber pullout, resulting in an increased fracture toughness. In this paper, we present microstructural observations on alumina (Al 2O 3)–barium zirconate (BaZrO 3) laminated composites wherein the reaction products that develop during processing resulted in sharp interfaces and appear to be weak enough to deflect cracks. These in situ reaction products in Al 2O 3–BaZrO 3 laminated composites were characterized with the use of a scanning electron microscope, an electron microprobe, and a transmission electron microscope. The phases that develop, ZrO 2, BaO·Al 2O 3, and BaO·6 Al 2O 3, produced sharp interfaces and are arranged in a sequence that could be predicted by using information from the phase diagram.

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