TY - JOUR
T1 - ZrB2-SiC coating to protect carbon/carbon composites against ablation
AU - Zou, Xu
AU - Fu, Qiangang
AU - Liu, Lei
AU - Li, Hejun
AU - Wang, Yongjie
AU - Yao, Xiyuan
AU - He, Zibo
PY - 2013/7/15
Y1 - 2013/7/15
N2 - To improve the ablation resistance of carbon/carbon (C/C) composites, a ZrB2-SiC coating was prepared by pack-cementation. The phase composition, microstructure and element distribution of the coating were analyzed using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The coated sample exhibits a dense structure and has an outstanding ablation property. During exposure to the oxyacetylene flame at about 2000K for 40s, the coated sample had a linear ablation rate of 4.4×10-3mm/s and a mass ablation rate of 6.2×10-5g/s. Compared with the uncoated C/C composites, the linear and mass ablation rate decreased by 49% and 97%, respectively. During the oxyacetylene torch test, a silica-scale glass was generated on the surface of the coating, and the embed ZrO2 could provide pinning effect to avoid cracking and spalling of the silica-scale glass. After the ablation test, some silica nanowires (SiONWs) were found in the ablation edge region of the sample. The growth mechanism of SiONWs consists of oxide-assisted growth (OAG) and vapor-liquid-solid (VLS) formation.
AB - To improve the ablation resistance of carbon/carbon (C/C) composites, a ZrB2-SiC coating was prepared by pack-cementation. The phase composition, microstructure and element distribution of the coating were analyzed using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The coated sample exhibits a dense structure and has an outstanding ablation property. During exposure to the oxyacetylene flame at about 2000K for 40s, the coated sample had a linear ablation rate of 4.4×10-3mm/s and a mass ablation rate of 6.2×10-5g/s. Compared with the uncoated C/C composites, the linear and mass ablation rate decreased by 49% and 97%, respectively. During the oxyacetylene torch test, a silica-scale glass was generated on the surface of the coating, and the embed ZrO2 could provide pinning effect to avoid cracking and spalling of the silica-scale glass. After the ablation test, some silica nanowires (SiONWs) were found in the ablation edge region of the sample. The growth mechanism of SiONWs consists of oxide-assisted growth (OAG) and vapor-liquid-solid (VLS) formation.
KW - Ablation
KW - Carbon/carbon composites
KW - Coating
KW - Nanowires
UR - http://www.scopus.com/inward/record.url?scp=84878018276&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2013.03.027
DO - 10.1016/j.surfcoat.2013.03.027
M3 - 文章
AN - SCOPUS:84878018276
SN - 0257-8972
VL - 226
SP - 17
EP - 21
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -