TY - JOUR
T1 - High strength retention and improved oxidation resistance of C/C composites by utilizing a layered SiC ceramic coating
AU - Li, Tao
AU - Zhang, Yulei
AU - Fu, Yanqin
AU - Sun, Jia
AU - Zhang, Jian
N1 - Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.
PY - 2021/5/15
Y1 - 2021/5/15
N2 - Silicon carbide (SiC) ceramic coating prepared by pack cementation (PC) can provide effective oxidation protection for carbon/carbon (C/C) composites at high temperatures. However, the reaction between free silicon and C/C substrates would cause the serious damage to mechanical properties of C/C composites. In current work, a carbon transition coating (CTC) was pre-prepared on C/C composites by slurry-carbonization before the preparation of SiC coating to eliminate the negative effect of siliconization. For comparison, SiC coating on C/C composites without CTC was also prepared. Due to the retardation effect of CTC on siliconization erosion, the flexural strength of SiC coated C/C composites with CTC maintained ~76.35 % compared with the raw C/C substrates, whereas the strength retention rate of SiC coated specimens without CTC was only ~36.92 %. Furthermore, the existence of CTC can densify the microstructure of as-prepared SiC coating by sufficiently reacting with free silicon during PC. Therefore, the SiC coated C/C composites with CTC possessed better oxidation resistances both under thermal cycling condition (between room temperature and 1500 °C) and in a water-vapor environment at 1500 °C.
AB - Silicon carbide (SiC) ceramic coating prepared by pack cementation (PC) can provide effective oxidation protection for carbon/carbon (C/C) composites at high temperatures. However, the reaction between free silicon and C/C substrates would cause the serious damage to mechanical properties of C/C composites. In current work, a carbon transition coating (CTC) was pre-prepared on C/C composites by slurry-carbonization before the preparation of SiC coating to eliminate the negative effect of siliconization. For comparison, SiC coating on C/C composites without CTC was also prepared. Due to the retardation effect of CTC on siliconization erosion, the flexural strength of SiC coated C/C composites with CTC maintained ~76.35 % compared with the raw C/C substrates, whereas the strength retention rate of SiC coated specimens without CTC was only ~36.92 %. Furthermore, the existence of CTC can densify the microstructure of as-prepared SiC coating by sufficiently reacting with free silicon during PC. Therefore, the SiC coated C/C composites with CTC possessed better oxidation resistances both under thermal cycling condition (between room temperature and 1500 °C) and in a water-vapor environment at 1500 °C.
KW - Carbon transition coating
KW - Mechanical property
KW - Oxidation resistance
KW - Silicon carbide coating
KW - Siliconization
UR - http://www.scopus.com/inward/record.url?scp=85099826075&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2021.01.208
DO - 10.1016/j.ceramint.2021.01.208
M3 - 文章
AN - SCOPUS:85099826075
SN - 0272-8842
VL - 47
SP - 13500
EP - 13509
JO - Ceramics International
JF - Ceramics International
IS - 10
ER -