Microstructural characterization of ZrB2–SiC based UHTC tested in the MESOX plasma facility |
| |
| Authors: | Davide Alfano Luigi Scatteia Frederic Monteverde Eric Bêche Marianne Balat-Pichelin |
| |
| Affiliation: | 1. CIRA–Centro Italiano Ricerche Aerospaziali, Capua (CE) 81043, Italy;2. CNR-ISTEC, National Research Council, Institute of Science and Technology for Ceramics, Faenza 48018, Italy;3. PROMES-CNRS Laboratory, 7 rue du four solaire, Font-Romeu Odeillo 66120, France;1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Mining and Metallurgy Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;3. Ceramic Department, Materials and Energy Research Center (MERC), Karaj, Iran;4. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea;1. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran;3. Materials and Energy Research Center, Karaj, Iran;4. Department of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;5. Department of Materials Science and Engineering, Faculty of Engineering, Malayer University, Malayer, Iran;1. Science and Technology on Advanced Composites in Special Environments Laboratory, Harbin Institute of Technology, Harbin 150001, PR China;2. China Aerodynamic Research and Development Center, Mianyang 621000, PR China;3. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, PR China;4. College of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, PR China;1. Department of Materials Science and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran;2. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;3. Department of Materials Science and Engineering, Faculty of engineering, Yasouj university, Yasouj, Iran;1. CNR-ISTEC, National Research Council of Italy – Institute of Science and Technology for Ceramics, Via Granarolo 64, 48018, Faenza, Italy;2. IPMS, Frantsevich Institute for Problems of Materials Sciences, 3 Krzhizhanovskoho St., 03680, Kyev, Ukraine |
| |
| Abstract: | Microstructures were investigated for ZrB2–SiC and ZrB2–HfB2–SiC ultra high temperature ceramics that were subjected to a high temperature plasma environment. Both materials were tested in the MESOX facility to determine the recombination coefficient for atomic oxygen up to 1750 °C in subsonic air plasma flow. Surfaces were analyzed before and after testing to gain a deeper insight of the surface catalytic properties of these materials. Microstructural analyses highlighted oxidation induced surface modification. Oxide layers were composed of silica with trace amounts of boron oxide and zirconia if the maximum temperature was lower than about 1550 °C and zirconia for higher temperatures. The differences in the oxide layer composition may account for the different catalytic behavior. In particular, the presence of a borosilicate glass layer on the surface of ZrB2–SiC materials guarantees atomic oxygen recombination coefficients that are relatively lower than the coefficients measured when only zirconia is present. The oxidation processes of ZrB2–HfB2–SiC materials, associated with catalytic tests carried out up to 1550 °C, lead to the formation of hafnia as well as silica, and zirconia. The higher recombination coefficients measured in the case of ZrB2–HfB2–SiC materials can be correlated with the presence of hafnia which is probably characterized by higher catalytic activity compared to zirconia. In any case, the investigated materials demonstrate a low catalytic activity over the inspected temperature range with maximum values of recombination coefficients close to 0.1. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
