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- W48789737 abstract "Three types of ceramic composite were exposed to flue gases of a hazardous waste incinerator to assess their corrosion behavior. One composite consisted of continuously wound filaments of Al{sub 2}0{sub 3}-23 wt % ZrO{sub 2} in an alumina matrix. This composite was tested, both uncoated and coated, with zirconia on the outer surface. The second composite type consisted of the same fiber but in a zirconia matrix The third composite consisted of an alumina matrix strengthened with silicon carbide particles. Tubes of these materials were exposed in the waste incinerator at about 900{degrees}C for times up to six months. Two principal results of exposure were revealed by optical microscopy and electron microprobe examinations: flue gas constituents either penetrated the uncoated alumina matrix of the filament-wound composite, apparently through porosity in the matrix, or deposited on the surfaces of the other composite types where reaction and bonding occurred. Neither event caused significant microstructural degradation although thereaction in the composite with a zirconia matrix suggests that degradation could be a problem under more severe conditions. Apparently, the concentration of penetrating species was too small to form a significant amount of new compounds that could cause degradation within the alumina matrix of themore » filament-wound composite, and the temperature was too low for the deposits on the surface of the other two types of composites to react significantly with the materials during the longest exposure of 6 months. The zirconia coating on the alumina matrix composite was not adherent enough to permit an assessment of its effect.« less" @default.
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- W48789737 date "1993-01-01" @default.
- W48789737 modified "2023-09-27" @default.
- W48789737 title "High-temperature corrosion of ceramic-ceramic composites in a waste incinerator environment" @default.
- W48789737 hasPublicationYear "1993" @default.
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