TY - GEN
T1 - Microstructure of Si-Al diffusive coatings on an advanced Nb silicide based ultrahigh temperature alloy
AU - Guo, Xiping
AU - Tian, Xiaodong
AU - Guan, Ping
PY - 2009
Y1 - 2009
N2 - Al modified silicide coatings have been prepared by Si-Al co-deposition pack cementation processes on an Nb silicide based alloy. The Si-Al co-deposition was conducted at 1000, 1050, 1100 and 1150°C for 8 hours respectively. The coatings had a multiple layer structure at all co-deposition temperatures, but different phase constituents formed in the outer layers of the coatings at different co-deposition temperatures. However, all the inner layers of the coatings were discontinuous and composed of (Nb,Ti)Al3 and (Cr,Al)2(Nb,Ti) phases. The coating prepared by Si-Al co-deposition at 1050°C were composed of an Nb3Si5Al2, (Nb,X)Si2 and (Nb5Ti)Al3 outer layer (where X represents Ti, Hf and Cr elements), a (Nb,X)5Si3 intermediate layer and the inner layer. The coating obtained by co-depositing Si and Al at 1000°C possessed an outer layer composed of (Nb,Ti)Al3 with small amount of (Nb,X)5Si3 and the inner layer. Both coatings prepared at 1100 and 1150°C possessed a (Nb,X)Si2 outer layer, a (Nb,X)5Si3 intermediate layer and the inner layer.
AB - Al modified silicide coatings have been prepared by Si-Al co-deposition pack cementation processes on an Nb silicide based alloy. The Si-Al co-deposition was conducted at 1000, 1050, 1100 and 1150°C for 8 hours respectively. The coatings had a multiple layer structure at all co-deposition temperatures, but different phase constituents formed in the outer layers of the coatings at different co-deposition temperatures. However, all the inner layers of the coatings were discontinuous and composed of (Nb,Ti)Al3 and (Cr,Al)2(Nb,Ti) phases. The coating prepared by Si-Al co-deposition at 1050°C were composed of an Nb3Si5Al2, (Nb,X)Si2 and (Nb5Ti)Al3 outer layer (where X represents Ti, Hf and Cr elements), a (Nb,X)5Si3 intermediate layer and the inner layer. The coating obtained by co-depositing Si and Al at 1000°C possessed an outer layer composed of (Nb,Ti)Al3 with small amount of (Nb,X)5Si3 and the inner layer. Both coatings prepared at 1100 and 1150°C possessed a (Nb,X)Si2 outer layer, a (Nb,X)5Si3 intermediate layer and the inner layer.
KW - Al-modified silicide coating
KW - Nb silicide based alloy
KW - Pack cementation process
KW - Si-Al co-deposition
UR - https://www.scopus.com/pages/publications/77950811976
M3 - 会议稿件
AN - SCOPUS:77950811976
SN - 9781615674237
T3 - The Minerals, Metals and Materials Society - 3rd International Conference on Processing Materials for Properties 2008, PMP III
SP - 1154
EP - 1160
BT - The Minerals, Metals and Materials Society - 3rd International Conference on Processing Materials for Properties 2008, PMP III
T2 - 3rd International Conference on Processing Materials for Properties 2008, PMP III
Y2 - 7 December 2008 through 10 December 2008
ER -