Notch sensitivity of fatigue life in a Sylramic TM/SiC composite at elevated temperature

Creep of Hi-Nicalon S Ceramic Fiber Tows at 800 deg C in Air and in Silicic Acid-Saturated Steam

“…Indeed, as of 2001, CMCs were being evaluated for use in various parts of hypersonic aircraft including leading edges, nose sections, inlet cowlings, and nozzles [15]. Use in engines can result in increased fuel efficiency and the elimination of cooling systems [12,18]. Other applications are listed in Table 1.…”

“…Oxidation embrittlement is a particular problem [18,29,41,42] in which oxygen reacts with the fibers and matrix of a CMC, causing them to form strong bonds and defeating the crack-deflecting properties intended. Oxidation embrittlement tends to occur at intermediate temperatures (600-900…”

Creep behavior in interlaminar shear of a Hi-NicalonTM/ SiC-B4C composite at 1200∘C in air and in steam

“…Since their constituents are intrinsically oxidation-prone, oxidation embrittlement is the most significant problem hindering SiC/SiC composites [5]. Typically the embrittlement occurs once oxygen enters through the matrix cracks and reacts with the fibers and the fiber coatings [6][7][8].…”

Tension–compression fatigue of a SiC/SiC ceramic matrix composite at 1200°C in air and in steam

“…Because their constituents are intrinsically oxidation-prone, the most significant problem hindering SiC/SiC composites is oxidation embrittlement [5]. Typically the embrittlement occurs once oxygen enters through the matrix cracks and reacts with the fibers and the fiber coatings [6][7][8].…”

“…The degradation of fibers and fiber coatings is generally accelerated in the presence of moisture [9]. Composite degradation may be further accelerated by cyclic loading, where the reaction gases are expelled from matrix cracks during unloading and oxidizing atmosphere is drawn into the composite through the matrix cracks during reloading [5]. The issue of improving the oxidation resistance of the SiC/SiC composites has been addressed through the design of innovative multilayered interphases [10][11][12] and of self-healing multilayered matrices [10,[12][13][14][15][16].…”