Fabrication and Mechanical Properties of In Situ Monazite-Coated Alumina Fiber-Reinforced Alumina/YAG Composites
Monazite(LaPO4)-coated alumina-fiber/alumina-YAG (Y3Al5O12) matrix composites were fabricated by in-situ coating of monazite followed by hot-pressing, and the effects of coating and sintering condition on mechanical properties of the composite were examined. Alumina powder and YAG powder (weight rat...
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Veröffentlicht in: | Key engineering materials 2007-01, Vol.352, p.213-218 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Monazite(LaPO4)-coated alumina-fiber/alumina-YAG (Y3Al5O12) matrix composites were
fabricated by in-situ coating of monazite followed by hot-pressing, and the effects of coating and
sintering condition on mechanical properties of the composite were examined. Alumina powder and
YAG powder (weight ratio, 95:5) were used as raw materials for green sheets, which was fabricated
by tape casting technique. Monazite was synthesized by the in-situ reaction of La(NO3) solution with
H3PO4 on the surface of fibers. After slurry infiltration into the coated fiber bundles, the fiber cloths
were laminated with the green sheets alternately, then they were heat-treated, finally sintered by
hot-pressing at various temperatures. The mechanical properties of the composites were changed by
the fabrication conditions. Non-brittleness of the composites reduced with the increase of sintering
temperature. The composites sintered at 1200oC showed the highest Weibull modulus and
pseudo-ductility. |
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ISSN: | 1013-9826 1662-9795 1662-9795 |
DOI: | 10.4028/www.scientific.net/KEM.352.213 |