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�������պ����ѧѧ�� 2011, Vol. 37 Issue (1) :119-122    DOI:
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Ԭ�ȷ�, ¬����*
�й�ʯ�ʹ�ѧ(����) ���繤��ѧԺ, ���� 102249
Preparation of Al-Co codeposition coating on surface of Ni-based alloy
Yuan Bifei, Lu Guiwu*
Faculty of Mechanical and Electronic Engineering, China University of Petroleum-Beijing, Beijing 102249, China

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Abstract�� A novel Ni-Al-Co coating was developed through pack cementation for protection of superalloys. Surface and cross-sectional observations of the coated specimens were preformed on a scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). X-ray diffraction (XRD) was used in order to detect the phases formed. The results show that the developed Ni-Al-Co coating, which is mainly composed of AlNi, AlCo and Al-Cr intermetallics, shows monolayer structure. The contents of Al and Co are obviously higher than that in the substrate. Furthermore, an interdiffusion layer has been developed between the Ni-Al-Co coating and the substrate. The interdiffusion layer shows good adherence on the substrate because no cracks and spalling was detected at the interface between the interdiffusion layer and the substrate. The formation of the interdiffusion layer may be induced by the precipitation of the elements of Cr,W,Mo,Ti during the pack cementation.
Keywords�� Ni-based alloy   pack cementation   Al-Co codeposition   protective coating   interdiffusion layer     
Received 2009-12-28;
About author: Ԭ�ȷ�(1974-),��,������������,��ʿ��,yuanbifei@hotmail.com.
Ԭ�ȷ�, ¬����.�����Ͻ����Al-Co����Ϳ���Ʊ�[J]  �������պ����ѧѧ��, 2011,V37(1): 119-122
Yuan Bifei, Lu Guiwu.Preparation of Al-Co codeposition coating on surface of Ni-based alloy[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(1): 119-122
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