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Phase Evaluation in Al2O3 Fiber-Reinforced Ti2AlC During Sintering in the 1300°C-1500°C Temperature Range.
- Source :
- Journal of the American Ceramic Society; Oct2011, Vol. 94 Issue 10, p3327-3334, 8p, 1 Color Photograph, 1 Black and White Photograph, 1 Diagram, 4 Charts, 5 Graphs
- Publication Year :
- 2011
-
Abstract
- In this article, the reactivity of Ti<subscript>2</subscript>AlC powders, with 3 and 10 μm alumina, Al<subscript>2</subscript>O<subscript>3</subscript>, fibers during pressure-assisted sintering is explored. Samples were fabricated by hot-isostatic-pressing ( HIPed) or hot-pressing ( HPed), and characterized by X-ray diffraction, differential thermal analysis, and electron microscopy-both scanning and transmission-equipped with energy dispersive X-ray spectroscopes. Samples prepared at 1300°C were fully dense, with no apparent reaction between fiber and matrix. In samples HPed to 1500°C, even pure Ti<subscript>2</subscript>AlC powders dissociated to Ti<subscript>3</subscript>AlC<subscript>2</subscript> according to: 2 Ti<subscript>2</subscript>AlC = Ti<subscript>3</subscript>AlC<subscript>2</subscript> + TiAl<subscript> x</subscript> ( l) + (1- x) Al ( l/ v), with x < 1. More severe Al loss results in the formation of TiC<subscript> y</subscript>. The presence of the Al<subscript>2</subscript>O<subscript>3</subscript> fibers delayed densification enough to allow most of the Al and some of the Ti to escape into the vacuum of the hot press or react with the encapsulating glass during HIPing a resulting in a more intensive dissociation of the Ti<subscript>2</subscript>AlC. Although, in principle Ti<subscript>2</subscript>AlC can be reinforced with Al<subscript>2</subscript>O<subscript>3</subscript> fibers, the processing/use temperature will have to be kept below 1500°C, as, at that temperature the fibers, used here, sinter together. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 94
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 66284037
- Full Text :
- https://doi.org/10.1111/j.1551-2916.2011.04612.x