TY - JOUR
T1 - Anti-ablation behavior of air plasma-sprayed Mo(Si, Al)2 coating
AU - Hou, Huidong
AU - Ning, Xianjin
AU - Wang, Quansheng
AU - Liu, Yanbo
AU - Liu, Ying
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/7/25
Y1 - 2015/7/25
N2 - The feedstock powder of Mo(Si, Al)2 (33.3Mo, 40.0Si, 26.7Al, at.%) with dominant C40 phase was prepared by self-propagating high-temperature synthesis and induction plasma spheroidization. Air plasma spraying was applied to deposit Mo(Si, Al)2 coating on the substrate of niobium alloy. The anti-ablation property of the coating was investigated under supersonic flame at 1400°C for 600s. The microstructure and ablation mechanism of coatings were studied. The results show that Mo(Si, Al)2 coating exhibited superior anti-ablation property without spallation and spattering during the whole exposure time. After ablation, an oxide scale of 5-7μm thick was formed on the well-preserved rigid surface of coating. Below the oxide scale, Mo(Si, Al)2 was replaced by a continuous Mo5Si3 layer due to the quick dissipation of aluminum. A large area of Mo(Si, Al)2 immediately beneath oxide scale is depleted in aluminum. The mixed oxide of silica, mullite and alumina is the key point to resist ablation of supersonic flame.
AB - The feedstock powder of Mo(Si, Al)2 (33.3Mo, 40.0Si, 26.7Al, at.%) with dominant C40 phase was prepared by self-propagating high-temperature synthesis and induction plasma spheroidization. Air plasma spraying was applied to deposit Mo(Si, Al)2 coating on the substrate of niobium alloy. The anti-ablation property of the coating was investigated under supersonic flame at 1400°C for 600s. The microstructure and ablation mechanism of coatings were studied. The results show that Mo(Si, Al)2 coating exhibited superior anti-ablation property without spallation and spattering during the whole exposure time. After ablation, an oxide scale of 5-7μm thick was formed on the well-preserved rigid surface of coating. Below the oxide scale, Mo(Si, Al)2 was replaced by a continuous Mo5Si3 layer due to the quick dissipation of aluminum. A large area of Mo(Si, Al)2 immediately beneath oxide scale is depleted in aluminum. The mixed oxide of silica, mullite and alumina is the key point to resist ablation of supersonic flame.
KW - Air plasma spraying
KW - Anti-ablation
KW - Induction plasma spheroidization
KW - Mixed oxide
KW - Mo(Si, Al)
UR - http://www.scopus.com/inward/record.url?scp=84929654279&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2015.04.036
DO - 10.1016/j.surfcoat.2015.04.036
M3 - Article
AN - SCOPUS:84929654279
SN - 0257-8972
VL - 274
SP - 60
EP - 67
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -