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The Reactivity of Ti 2 AlC and Ti 3 SiC 2 with SiC Fibers and Powders up to Temperatures of 1550°C
Author(s) -
Spencer Charles B.,
Córdoba Jose M.,
Obando Nicholas H.,
Radovic Miladin,
Odén Magnus,
Hultman Lars,
Barsoum Michel W.
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04332.x
Subject(s) - materials science , transmission electron microscopy , scanning electron microscope , composite material , hot pressing , max phases , differential thermal analysis , reactivity (psychology) , diffraction , hot isostatic pressing , microstructure , carbide , nanotechnology , optics , pathology , physics , medicine , alternative medicine
The reactivities of commercially available Ti 2 AlC or Ti 3 SiC 2 powders with uncoated SiC fibers or SiC powders were evaluated in this paper. When Ti 2 AlC–SiC samples were hot pressed or hot isostatically pressed at temperatures up to 1500°C, fully dense composites were obtained. The latter were characterized by X‐ray diffraction and electron‐dispersive spectroscopy in a scanning and transmission electron microscope. Differential thermal analysis up to 1550°C was also carried out. In all cases, SiC reacted with the Ti 2 AlC powder resulting in the formation of Ti 3 (Al 1− x Si x )C 2 TiC and Al 1+ x Ti 1− x , where x ranges from 0 to 1. In the limit x =1, pure Al forms. Conversely, Ti 3 SiC 2 samples, reinforced with uncoated SiC fibers or powders, can be hot pressed in vacuum at temperatures as high as 1500°C to produce fully dense composites with no apparent reaction between the matrix and fibers. Based on these results, Ti 3 SiC 2 can, but Ti 2 AlC cannot, be reinforced with SiC. Such reinforcements will be needed if the MAX phases are to be used as structural materials at very high temperatures.