Effects of yttrium on wettability and interactions between molten superalloy and SiO2-based ceramic core

Yun Zi, Jie Meng, Mingke Zou, Wei Xu, Jinguo Li, Ke Xu, Yizhou Zhou, Yutian Ding

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)7324-7335
Number of pages12
JournalCeramics International
Volume46
Issue number6
DOIs
Publication statusPublished - 2020

Keywords

  • High-temperature wettability
  • Interface reaction
  • Molten superalloy
  • SiO-based ceramic core
  • Yttrium

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