Hot sodium sulphate corrosion of a Nicalon silicon carbide fibre-reinforced lithium aluminosilicate glass-ceramic matrix composite

Microstructural Study of the Hot Corrosion of a Calcium Aluminosilicate Glass‐Ceramic and a Si‐C‐O‐Fiber‐Reinforced Calcium Aluminosilicate Matrix Composite via Sodium Sulfate in Air and Argon at 900°C

“…Similar changes in the fiber/matrix interface microstructure have been reported in composites that have undergone hot corrosion and oxidation. 14,18 However, the interfacial layers are much wider than those which are observed during oxidation heat treatments in air; 14 this again suggests that the kinetics of the oxidation process have increased during the hot corrosion process.…”

“…Most of the work that has been reported in the literature involves microstructure and mechanical behavior [1][2][3][4][5][6][7][8][9] and thermomechanical performance, [10][11][12] although some limited attention has been given to the effects of environment on the performance of these composites. [13][14][15][16][17][18] Because these materials can possibly be used in naval gas-turbine engines, it is important to assess the combined effects of the aggressive environment of sea water and aviation fuel on the performance of these composites. ''Hot corrosion'' is an undesirable chemical process that can cause a drastic degradation of the mechanical properties of composites that contain Si-C-O fibers in glass-ceramic matrices; the term ''hot corrosion'' is often used to describe the process of corrosion that involves a condensed phase deposit such as alkali-metal salts and has been extensively studied for metals 19 and for some silicon-based ceramics.…”

“…Hot corrosion can modify the surface microstructure of the materials and can degrade the mechanical properties significantly. [16][17][18]25 Therefore, it is important to investigate the effects of hot corrosion on the microstructure of the composites that have been projected as potential candidates for naval gas-turbine applications. Preliminary studies show that monolithic CAS and its Si-C-O-fiber-reinforced composite (Si-C-O-CAS) both are unstable in marine environments and lose their attractive mechanical properties, because of adverse microstructural changes during the hot corrosion process.…”

Enhanced mechanical properties of carbon fibre/lithium aluminosilicate composites modified by SiB6 addition

“…Their flexural strength and fracture toughness are in the range of 100–250 MPa and 1–1.5 MPa m 1/2 , respectively [4-6]. To overcome this shortcoming, some reinforced additives and second phases are usually added into LAS-based composites for the purpose of increasing mechanical properties [711]. Compared with other reinforcements, carbon fibres (C f ) have demonstrated a wide range of properties, including high strength, low density and unique wear resistance.…”