Oxidation behavior of graphene nanoplatelet reinforced tantalum carbide composites in high temperature plasma flow |
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| Affiliation: | 1. Plasma Forming Laboratory, Nanomechanics and Nanotribology Laboratory, Mechanical and Materials Engineering, 10555 West Flagler Street, EC 3464, Florida International University, Miami, FL 33174, USA;2. AMPAC and Nanoscience Technology Center, 4000 Central Fl Boulevard, University of Central Florida, Orlando, FL 33816, USA;1. Key Laboratory for liquid-solid Structural Evolution & Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, PR China;2. Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250061, PR China;1. Plasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, United States;2. Clarkson Aerospace Corporation, Houston, TX, 77004, United States;1. Materials Science and Engineering, Indian Institute of Technology Patna, Bihta-Kanpa Road, Bihta, Patna, Bihar, 801 103, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600 036, India;3. Centre for Nanoscience and Technology, Madanjeet School of Green Energy Technologies, Pondicherry University, Puducherry, 605014, India |
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| Abstract: | Graphene nanoplatelets (GNP) reinforced tantalum carbide (TaC) composites are exposed to a high temperature plasma flow in order to evaluate the effects of GNP on the oxidation behavior of TaC at conditions approaching those of hypersonic flight environments. The addition of GNP is found to suppress the formation of the oxide layer by up to 60%. The high thermal conductivity of GNPs dissipates heat throughout the sample thereby reducing thermal gradients and reducing the intensity of heating at the surface exposed to plasma. In addition, GNPs enhance oxidation resistance by providing toughening which suppresses crack formation and bursting that accelerates oxidation. Scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HR-TEM) reveal that GNPs have the ability to survive the intense high temperature of the plasma. GNPs are believed to seal oxide grain boundaries and hinder the further influx of oxygen. GNPs also provide nano sized carbon needed to induce the localized reduction of Ta2O5 to TaC. Micro computed X-ray tomography (MicroCT) validates that the above mechanisms protect the underlying unoxidized material from the structural damage caused by thermal shocks and high shear forces, by reducing thermal gradients and providing toughness. |
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