TY - JOUR
T1 - Effects of yttrium on wettability and interactions between molten superalloy and SiO2-based ceramic core
AU - Zi, Yun
AU - Meng, Jie
AU - Zou, Mingke
AU - Xu, Wei
AU - Li, Jinguo
AU - Xu, Ke
AU - Zhou, Yizhou
AU - Ding, Yutian
PY - 2020
Y1 - 2020
N2 - In order to obtain high-quality superalloy castings, the wettability and interactions between superalloy melts with various Y contents and SiO2-based ceramic cores were investigated at 1823 K. The results indicated that the wettability and interface reactions were affected by the content of Y in the alloy. For the alloys with Y content less than 0.011 wt%, no Y-oxide was found at the interface, but HfO2, Al2O3 and ZrO2 phases were formed, and the wetting angle dropped slightly. However, different Y-oxides precipitated at the alloy-ceramic interface for the alloys with Y content more than 0.017 wt%, and the wetting angle dropped sharply. When the content of Y was 0.017 and 0.025 wt%, Al2O3, Y3Al2(AlO4)3, HfO2 and ZrO2 phases were formed at the interface. When the content of Y was 0.1 wt%, YAlO3, Y3Al5O12, Y4Al2O9, HfO2 and ZrO2 phases were formed. The formation of different reaction products was mainly caused by the change of Y activity (aY) in the alloy. The reaction between Y and SiO2 could improve the wettability of the system apparently.
AB - In order to obtain high-quality superalloy castings, the wettability and interactions between superalloy melts with various Y contents and SiO2-based ceramic cores were investigated at 1823 K. The results indicated that the wettability and interface reactions were affected by the content of Y in the alloy. For the alloys with Y content less than 0.011 wt%, no Y-oxide was found at the interface, but HfO2, Al2O3 and ZrO2 phases were formed, and the wetting angle dropped slightly. However, different Y-oxides precipitated at the alloy-ceramic interface for the alloys with Y content more than 0.017 wt%, and the wetting angle dropped sharply. When the content of Y was 0.017 and 0.025 wt%, Al2O3, Y3Al2(AlO4)3, HfO2 and ZrO2 phases were formed at the interface. When the content of Y was 0.1 wt%, YAlO3, Y3Al5O12, Y4Al2O9, HfO2 and ZrO2 phases were formed. The formation of different reaction products was mainly caused by the change of Y activity (aY) in the alloy. The reaction between Y and SiO2 could improve the wettability of the system apparently.
KW - High-temperature wettability
KW - Interface reaction
KW - Molten superalloy
KW - SiO-based ceramic core
KW - Yttrium
UR - http://www.scopus.com/inward/record.url?scp=85076224849&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.11.228
DO - 10.1016/j.ceramint.2019.11.228
M3 - Article
AN - SCOPUS:85076224849
SN - 0272-8842
VL - 46
SP - 7324
EP - 7335
JO - Ceramics International
JF - Ceramics International
IS - 6
ER -