Microstructure evolution and bonding mechanisms of silica sol bonded coating at elevated temperatures |
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| Affiliation: | 1. School of Materials Science and Engineering, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, PR China;2. College of Chemistry and Chemical Engineering, Cangzhou Normal University, Cangzhou 061001, PR China;3. College of Science, Civil Aviation University of China, Tianjin 300300, PR China;1. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi’an 710049, China;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava 45, Slovakia;4. State Key Laboratory of High Performance Ceramics and Super Fine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Federal University of Sao Carlos, Graduate Program in Materials Science and Engineering, Rod. Washington Luiz km 235, São Carlos, SP, 13656-905, Brazil;2. CNRS, CEMHTI UPR3079, University Orléans, F-45071, Orléans, France;1. National Key laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, PR China;2. China Academy of Launch Vehicle Technology, Beijing 100000, PR China |
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| Abstract: | High emissivity coating plays a critical role in thermal protective system, which can radiate a large amount of aero-convective heat. Silica sol bonded MoSi2-SiC-Al2O3 (S-MSA) coating was proved to be promising for mullite fibrous insulation. However, the bonding mechanisms of the coating at elevated temperatures are not clear. In this work, the S-MSA coatings were heat-treated at temperatures from 600 °C to 1500 °C to reveal the bonding mechanisms at elevated temperatures. The S-MSA coatings go through a relatively stable stage (600 °C–1000 °C), a crystallization stage (1100 °C–1200 °C), and a densification stage (1300 °C–1500 °C) at ever increasing temperatures. Results show that both the contact damage resistance and the bonding strength of the calcined coatings exhibit a decrease followed by an increase at elevated calcination temperatures, with the inflection point at 1200 °C, corresponding to the transition temperature of the bonding mechanisms from 600 °C to 1500 °C. |
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| Keywords: | Coating Sol-gel processes Microstructure Mechanical properties Bonding mechanisms |
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