Interfacial reaction between zirconium alloy and graphite mold/yttrium oxide ceramic mold

Zirconium alloys are active in the molten state and tend to react with the mold during casting. The casting technology of zirconium is not yet well established; especially in selecting the mold materials, which are difficult to determine. In the present work, the interfacial reactions between zircon...

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Bibliographic Details
Published in:China foundry 2014-03, Vol.11 (2), p.85-90
Main Authors: Xie, Huasheng, Liu, Hongyu, Zhao, Jun, Liu, Shibing, Shi, Kun
Format: Article
Language:English
Subjects:
Ceramic molds
Electric arc furnaces
Graphite
graphite mold
Interface reactions
Molds
reaction layer
Yttrium oxide
yttrium oxide ceramic mold
Zirconium
zirconium alloy
Zirconium base alloys
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Summary:Zirconium alloys are active in the molten state and tend to react with the mold during casting. The casting technology of zirconium is not yet well established; especially in selecting the mold materials, which are difficult to determine. In the present work, the interfacial reactions between zirconium casting and casting mold were studied. The zirconium alloy was melted in a vacuum arc skull furnace and then cast into the graphite mold and ceramic mold, respectively. The zirconium casting samples were characterized using SEM, EDS and XRD with an emphasis on the chemical diffusion of elements. A reaction layer was observed at the casting surface. Chemical analysis shows that chemical elements C, O and Y from the mold are diffused into the molten zirconium, and new phases, such as ZrC, Zr30, YO1.335 and Y6ZrO11, are formed at the surface. In addition, an end product of zirconium valve cast in a yttria mold has a compact structure and good surface quality.
ISSN:1672-6421
2365-9459