NEW ADVANCED DESIGN OF CARBON/CARBON COMPOSITES FOR HYPERSONIC SYSTEMS.
Hypersonic flight presents a difficult challenge for control design. High velocity causes the aircraft to be very sensitive to changes in the flight condition. For example, at an altitude of 34 km and a Mach number of 15 a 1-deg increase in angle of attack produces a normal acceleration of 3.5 m/s2, a load factor of about l/3g. This is a critical aspect for structures. Thermal loads are also protagonists as one of the critical areas for structures. Carbon/Carbon (C/C) composites, which withstand temperatures in excess of 2000℃ without major deformation, are by far the most suitable materials for these applications. Moreover, C/C composites with high thermal conductivity are important for first wall components for nuclear fusion reactors, hypersonic aircraft, missiles and spacecraft, thermal radiator panels and electronic heat sinks. The thermal conductivity at temperatures major of 1000℃ increases with the heat treatment temperature, particularly above 2800℃, as more graphitic carbon is associated with a higher thermal conductivity. However, there is one major drawback, which is its susceptibility to oxidation above 500℃ which becomes progressively more severe as the temperature rises. The rate of oxidation is limited only by the diffusion rate of oxygen through the surrounding gas to the carbon surface. Another drawback is that the properties are dependent on the manufacturing methods used. Although the general production technology is known, the combination of processes to achieve specially tailored properties remains the expertise of particular manufacturers. For these reasons much research has to be done, in order to optimize each stage of production of these composites. Here are reported the main results of SASLab research on C/C composites production.
Carbon fiber Phenolic resin pyrolysis CVD SiC coating
Marta Albano Fara Cioeta Plinio Coluzzi Mario Marchetti
SASLab, DIAEE (Dipartimento di Ingegneria Astronautica Elettrica ed Energetica), Sapienza Universita SASLab, DIAEE (Dipartimento di Ingegneria Astronautica Elettrica ed Energetica), Sapienza Universita
国际会议
上海
英文
74-84
2011-11-21（万方平台首次上网日期，不代表论文的发表时间）