Bamboo like SiC Nanowires Grown in a Dual-Temperature Zone Reaction System Enhance the Oxidation and Thermal Shock Resis
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Bamboo like SiC Nanowires Grown in a Dual‑Temperature Zone Reaction System Enhance the Oxidation and Thermal Shock Resistance of SiC Coatings Binbin Li1 · Xingbang Wang1 · Bangxiao Mao1 · Tao He1 · Haiquan Huang1 · Xiaosen Yuan1 Received: 9 July 2020 / Accepted: 6 November 2020 © Springer Nature B.V. 2020
Abstract The life of high temperature coating mainly depends on its oxidation resistance and bonding strength with the substrate. S iCnws / SiC coatings were prepared by a self-made two temperature reaction system and chemical vapor deposition method. The oxidation resistance of the composite coating at 900 ℃ and 1500 ℃ and the thermal shock resistance at 1500 ℃ were studied. The fracture toughness and bonding strength of the composite coating were increased by 53.8% and 9.8 times, respectively, due to the stable mechanical linkage effect between the bamboo like SiC nanowires with special nodes and SiC. Due to the iCnws / SiC coating healing effect of glass phase S iO2, the weight loss rate of bamboo like S sample after oxidation at 900 ℃ for 30 h is about 5.28%, and that after isothermal oxidation at 1500 ℃ for 60 h is only 0.74%. In addition, bamboo like SiCnws can effectively alleviate the thermal expansion coefficient mismatch between SiC coating and substrate. After 25 thermal shock cycles, the final oxidation weight loss rate of composite coating is only 2.03%. Keywords Bamboo like SiC nanowires · Two temperature zone reaction · SiC coating · Oxidation resistance · Thermal shock resistance
1 Introduction With the development of aviation and aerospace industry, the surface temperature of high-performance engine, high-temperature heat exchanger and rocket nozzle will reach more than 1300 ℃, far exceeding the service temperature of traditional metal and polymer matrix composites [1–6]. Carbon/carbon (C/C) composites exhibit prominent properties (e.g., high specific strength, low density and ablation resistance), which are widely used in aerospace [7–10]. Due to long service time, C / C composites will be exposed to high * Binbin Li [email protected] 1
International Laboratory for Insulation and Energy Efficiency Materials, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, PR China
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Applied Composite Materials
temperature oxidation atmosphere for a long time, which will inevitably lead to failure due to oxidation. So far, the application of protective coating system has been proved to be an effective method to protect C / C composites from oxidation at high temperature [11–13]. SiC coating has become one of the most widely used high temperature oxidation protection coatings due to its high hardness, good corrosion resistance and good chemical stability. However, due to the mismatch of thermal expansion coefficient between SiC coating and C / C substrate under high temperature and stress, cracks are inevitable [14]. These cracks will cause more oxidation of the material matrix. In addition, once the composite
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