Oxidation behaviour of carbon short fibre reinforced C/SiC composites

Oxidation Kinetics and Its Impact on the Strength of Carbon Short Fiber Reinforced C/SiC Ceramics

“…Under normal pressure, SiC slowly forms a passivating SiO 2 layer at relative high temperature between approx. 800-1000 8C according to the following equation, which is called passivating oxidation: [20][21][22]26,33] SiC ðSÞ þ 2O 2ðGÞ ! SiO 2ðSÞ þ CO 2ðGÞ Due to this silica formation and the thermal expansion for the crack clothing, the system needs more energy to initiate the oxidation reaction of carbon in the high temperature range above 800 8C.…”

“…[24,25] While for the latter a good number of studies already exist, only a few studies are published discussing the relevance between the fiber orientation/length and oxidation/mechanical properties. [26][27][28] For short fiber reinforced C/SiC composites the carbon reactivity increases as the temperature increases. It is suggested, that oxidation takes place along fibers which have direct contact with the surface and spreads along the fiber network.…”

“…Here the role of micro cracks for continuous fiber reinforced C/SiC composite is negligible. [26] The main objective of the paper is to determine the oxidation impact on carbon short fiber reinforced C/SiC ceramics with different fiber length and fiber orientation. The weight loss of the composites was monitored over time as in thermogravimetric analysis (TGA) experiments and mechanical properties assessed.…”

Numerical modeling of oxidized C/SiC microcomposite in air oxidizing environments below 800 °C: Microstructure and mechanical behavior

“…Many typically C/SiC components in aerospace engineering, e.g., combustor liners for gas turbine engines, would be constantly loaded in high temperature oxidizing environments over hundreds even thousands of hours [1,2]. However, the susceptibility of the carbon fibers and interphases to oxidation [3][4][5] has hindered the long-term reusable applications in high temperature oxidizing environments. Since the as-fabricated micro-cracks in the SiC matrix act as oxygen transport paths, the exposed carbon interphases and fibers are susceptible to the oxidation, which leads to strength reduction and component failure.…”

Fabrication and mechanical properties of carbon short fiber reinforced barium aluminosilicate glass–ceramic matrix composites

“…Another advantage of the use of short fibers instead of conventionally used long fibers is that the short fibers allow the development of an inner oxidation protection, i.e. the inner short fibers can be protected by the matrix [12]. However, fabrication and properties of short fibers-reinforced BAS composites have not been reported.…”