Tensile and creep performance of a novel mullite fiber at high temperatures |
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| Affiliation: | 1. Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, 28359 Bremen, Germany;2. Institute of Textile Chemistry and Chemical Fibers, Körschtalstraße 26, 73770 Denkendorf, Germany;3. MAPEX – Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany;1. Department of Mechanical Engineering, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, TX 78539, United States;2. Department of Chemistry, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, TX 78539, United States;1. Unidade Acadêmica de Engenharia de Materiais, Universidade Federal de Campina Grande, Avenida Aprígio Veloso 882, Campina Grande 58109-970, PB, Brazil;2. Departamento de Engenharia de Materiais, Universidade Federal da Paraíba, Cidade Universitária, João Pessoa 58059-900, PB, Brazil;1. School of Materials Science and Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing 210094, China;2. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, N.W., Atlanta, GA 30332-0245, USA |
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| Abstract: | The novel fiber CeraFib75 with a composition near to pure mullite was analyzed with respect to its potential for high-temperature applications. This mullite fiber free of glass phase was aimed to overcome the strength of commercial oxide fibers at high-temperatures. Tensile tests at room and high temperatures ranging from 900 to 1400 °C and creep tests were performed. Nextel?720, another crystalline mullite-alumina fiber, was tested as a reference. Microstructure and crystal phase analysis of the new fiber revealed mullite grains with traces of γ- and α-alumina in-between; it contains occasionally defects causing a reduced strength at room-temperature. Remarkably, at temperatures beyond 1200 °C, CeraFib75 presented a higher tensile strength than Nextel?720. During tensile tests at 1400 °C, an extended region of inelastic deformation was observed for CeraFib fibers only, which was related to a grain boundary sliding mechanism. Creep rates were of the same order of magnitude for both fibers. |
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| Keywords: | A Ceramic fiber B Mechanical properties B High-temperature properties B Inelastic deformation |
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