Multilayer coating with self-sealing properties for carbon–carbon composites

Long-term oxidation behavior of carbon/carbon composites with a SiC/B4C–B2O3–SiO2–Al2O3 coating at low and medium temperatures

“…However, C/C composites are prone to oxidize above 400°C in an environment containing oxygen [1][2][3][4]. This limits their applications in oxygen-containing atmospheres at temperatures above the initial oxidation temperature.…”

“…At high temperatures from 1300 to 1630°C, multi-composition coatings with silicon-containing ceramics such as molybdenum disilicide (MoSi 2 ), chromium disilicide (CrSi 2 ), silicate (Y x SiO y ) (or yttrium oxide (Y 2 O 3 )), mullite (3Al 2 O 3 Á2SiO 2 ) and silicon carbide (SiC) are the most promising candidates for protecting C/C composites for long time in an static oxidation environment [2,[5][6][7][8][9][10][11]. A MoSi 2 /SiC coating, fabricated by Huang et al [5] through a hydrothermal electrophoretic deposition technique, can protect C/C composites from oxidation at 1773 K for 346 h with a weight loss of 2.49 mg cm À2 and at 1903 K for 88 h with a weight loss of 5.68 mg cm À2 .…”

Microstructure and oxidation protection of borosilicate glass coating prepared by pulse arc discharge deposition for C/C composites

“…In addition, the glass coating can retain the integrality of the coating during its exposure to an oxygen containing atmosphere at high temperature [10]. The traditional technologies for preparing outer coatings, such as a slurry method [11] and pack cementation [12] usually result in the generation of thermal stress and even microcracks in the coatings during the heat treatment. Finally, the coatings prepared by hydrothermal electrophoretic deposition [13] are loose and may weaken the oxidation resistance.…”

Oxidation behavior of silicon carbide based biomorphic ceramics prepared by chemical vapor infiltration and reaction technique

“…However, the difficulty in developing effective SiC oxidation protective layers comes from the mismatch of the coefficient of thermal expansion (CTE) between SiC and SiO 2 , which leads to crack formation and even debonding under severe oxidation conditions. Some authors tried to solve this problem applying functionally graded coatings [12] or multi-layer coatings [13]. Our approach, studied in this work was to introduce a second phase such as Si 3 N 4 in addition to SiC to form SiC-Si 3 N 4 composites in order to improve the oxidation resistance minimizing the thermal mismatch with SiO 2 www.elsevier.com/locate/ceramint layer formed after oxidation.…”