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Thesis
Fiber-reinforced Ti₃SiC₂ and Ti₂AlC mAX phase composites
Master of Science (M.S.), Drexel University
Jun 2010
DOI:
https://doi.org/10.17918/etd-3302
Abstract
It was proposed that reinforcing commercially available MAX phase powders would enhance their high temperature mechanical properties in general, and their creep resistance in particular. Three reaction pairs were studied; Ti₂AlC:Al2O3, Ti₂AlC:SiC and Ti₃SiC₂:TiC:SiC. Composites were hot-pressed and hot-isostatic pressed to temperatures as high as 1500 °C. At 1300 °C dense Ti₂AlC-alumina composites were fabricated wherein the fibers did not appear to sinter together. At 1500 °C, the alumina fibers agglomerated and sintered together and presumably lost their structural integrity. At these same temperatures, the SiC fibers reacted with the Ti₂AlC matrix, losing their integrity as well. It was also shown, through the use of differential scanning calorimetry and x-ray diffraction that Ti₂AlC is only kinetically stable at 1500 °C and when the activity of Al in the processing environment is small, Al is lost while Ti3AlC2 and Ti-aluminides are formed. With the Ti₃SiC₂:TiC:SiC combination, however, processed at 1500 °C, no evidence for a reaction was found. The SiC/Ti₃SiC₂ interface remained sharp and reaction free. These samples were fully dense. Preliminary results have shown that ~ 6 vol. % SiC fibers, decreased the creep tensile strain rates at 1100 °C, and increased the times to failure. Based on this work, we conclude that when continuous SiC fibers are incorporated in Ti₃SiC₂, an increase in the latter's high temperature creep response will occur and is thus a viable method of extending the life of Ti₃SiC₂-based materials in high temperature load bearing applications.
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Details
- Title
- Fiber-reinforced Ti₃SiC₂ and Ti₂AlC mAX phase composites
- Creators
- Charles B. Spencer - DU
- Contributors
- Michel W. Barsoum (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 3302; 991014632543404721