INTERFACE REACTION BETWEEN CERAMIC MOULDS AND Ti46Al1B AS--CAST VALVES

Acta Metall Sin

2009, Vol. 45

Issue (3): 369-373 DOI:

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INTERFACE REACTION BETWEEN CERAMIC MOULDS AND Ti46Al1B AS--CAST VALVES

MA Yingche; WANG Weidong; CHEN Bo; GAO Ming; LIU Kui; LI Yiyi

Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016

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MA Yingche WANG Weidong CHEN Bo GAO Ming LIU Kui LI Yiyi. INTERFACE REACTION BETWEEN CERAMIC MOULDS AND Ti46Al1B AS--CAST VALVES. Acta Metall Sin, 2009, 45(3): 369-373.

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Abstract

Al₂O₃ and Y₂O₃ were used as surface materials of shell mould to centrifugal--cast Ti46Al1B (atomic fraction, %) valves, the interface reaction between shell and alloy and its mechanism were analyzed by SEM and XRD, and oxygen increment in the castings was measured by gas analysis. The results show that the reaction layer thicknesses of Y₂O₃ and Al₂O₃ shells are about 90 and 170 μm, respectively, indicating Y₂O₃ shell has better thermodynamic stability and smaller increment of oxygen in casting than Al₂O₃ shell, which is accordant with thermodynamic calculation. So the Y₂O₃ mould is fitter for casting Ti46Al1B valves than Al₂O₃ mould.

Key words: TiAl alloy centrifugal casting interface reaction reaction layer thermodynamics

Received: 21 August 2008

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	MA Ying-Che
	CHEN Bei
	YU Wei-Dong
	GAO Meng
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	LI Yi-Yi

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I3/369

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