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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Microstructure and interface fracture
of  LPPS Ni/Fe and Cu/Ni sprayed
 materials
LI Dong-fei(李东飞),SHAO Bei-ling(邵贝羚),
LIU An-sheng(刘安生), AN Sheng(安  生),ZHU Qi-fang(朱其芳)

General Research Institute for Non-Ferrous Metals,
Beijing 100088, China

Abstract:The interfaces of two materials, Ni/Fe and Cu/Ni, deposited by low pressure plasma spraying method, were studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with energy dispersive X-ray spectroscopy (EDS). The adhesion between coatings and substrates was measured with the aid of Knoop interfacial indentation testing method. The results show that the interfacial microstructures have strong influence on the mechanical properties. Cu/Ni interface is weak link with NiO amorphous phase. Ni/Fe interfacial layer consists primarily of Fe and Ni oxide crystalline phases, containing dispersive (Fe, Ni) spotlike intermetallic compound phase in nanometer dimension, and the interfacial interdiffusion was detected. The micro-mechanism of interfacial fracture was discussed.

 

Key words: microstructures; interfacial bonding strength; low-pressure plasma spraying; amorphous phase

ISSN 1672-7029
CN 43-1423/U

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