Master of Science (MS)
Materials Science and Engineering
First Advisor's Name
First Advisor's Committee Title
Second Advisor's Name
Third Advisor's Name
William Kinzy Jones
Tantalum Carbide, graphene, graphene nanoplatelets, spark plasma sintering, nanocomposites, ceramic matrix composites, ultra high temperature ceramics, high temperature oxidation, fracture toughness
Date of Defense
Hypersonic aerospace vehicles are severely limited by the lack of adequate high temperature materials that can withstand the harsh hypersonic environment. Tantalum carbide (TaC), with a melting point of 3880°C, is an ultrahigh temperature ceramic (UHTC) with potential applications such as scramjet engines, leading edges, and zero erosion nozzles. However, consolidation of TaC to a dense structure and its low fracture toughness are major challenges that make it currently unviable for hypersonic applications. In this study, Graphene NanoPlatelets (GNP) reinforced TaC composites are synthesized by spark plasma sintering (SPS) at extreme conditions of 1850˚C and 80-100 MPa. The addition of GNP improves densification and enhances fracture toughness of TaC by up to ~100% through mechanisms such as GNP bending, sliding, pull-out, grain wrapping, crack bridging, and crack deflection. Also, TaC-GNP composites display improved oxidation behavior over TaC when exposed to a high temperature plasma flow exceeding 2500 ˚C.
Nieto, Andy, "Graphene NanoPlatelets Reinforced Tantalum Carbide consolidated by Spark Plasma Sintering" (2013). FIU Electronic Theses and Dissertations. 840.
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