Evaluation of porous ZrO2-SiO2 and monazite coatings using Nextel 720-fiber-reinforced blackglas minicomposites

A procedure was developed to fabricate oxide-fiber-reinforced minicomposites with a dense matrix and evaluate two oxidation-resistant interface coatings, porous oxide (zirconiasilica mixture) and monazite. The coatings were evaluated using Nextel 720-fiber-reinforced Blackglas-matrix minicomposites....

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2001-07, Vol.84 (7), p.1526-1532
Main Authors: PARTHASARATHY, Triplicane A, BOAKYE, Emmanuel E, KELLER, Kristin A, HAY, Randall S
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary:A procedure was developed to fabricate oxide-fiber-reinforced minicomposites with a dense matrix and evaluate two oxidation-resistant interface coatings, porous oxide (zirconiasilica mixture) and monazite. The coatings were evaluated using Nextel 720-fiber-reinforced Blackglas-matrix minicomposites. Boron nitride (BN) coated and uncoated fibers were used as controls for comparison. The evaluation was based on ultimate failure strengths, fractography, and fiber pushin tests. All the composites that used fiber coatings had ultimate strengths significantly better than the control that used uncoated fibers. In addition, porous-oxide-coated fibers were found to be similar to BN-coated fibers in strength, fractography, and fiber pushin behavior. Monazite-coated fibers resulted in similar ultimate strengths but showed no appreciable fiber pullout. Fiber pushin tests showed that monazite debonds readily but frictional resistance is higher than for BN or porous oxide fiber coatings. (Author)
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2001.tb00872.x