Effects of Temperature Induced Thermal Expansion and Oxidation on the Charpy Impact Property of C/C Composites
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第3期
论文作者：米应映 燕青芝 LI Xianhui HONG Ming CAO Meiqi ZHANG Xiaoxin
文章页码：473 - 477
摘 要：C/C composites are the emerging materials of choice for aero-engine hot-end components that will bear impact loading in thermal-oxidizing environments. For the components run for extended periods, the safe operation of components depends on how to evaluate damages under a dynamic load. In this study, Charpy impact tests at a temperature range of 25 to 1 200 ℃ were carried out on C/C composites to verify the effects of temperature induced thermal expansion and oxidation on their impact performance. Below 800 ℃, oxidation was negligible and composites expanding played a leading role, resulting in the remarkable increase in fi ber/matrix interface strength and impact energy. However, when the temperature was above 800 ℃, the release of CO or CO2 due to oxidation resulted in a lower impact energy.
米应映，燕青芝，LI Xianhui，HONG Ming，CAO Meiqi，ZHANG Xiaoxin
Institute of Nuclear and New Energy Systems Materials, University of Science and Technology Beijing
摘 要：C/C composites are the emerging materials of choice for aero-engine hot-end components that will bear impact loading in thermal-oxidizing environments. For the components run for extended periods, the safe operation of components depends on how to evaluate damages under a dynamic load. In this study, Charpy impact tests at a temperature range of 25 to 1 200 ℃ were carried out on C/C composites to verify the effects of temperature induced thermal expansion and oxidation on their impact performance. Below 800 ℃, oxidation was negligible and composites expanding played a leading role, resulting in the remarkable increase in fi ber/matrix interface strength and impact energy. However, when the temperature was above 800 ℃, the release of CO or CO2 due to oxidation resulted in a lower impact energy.
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