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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

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Bonding of Al2O3ceramic and Nb using transient
liquid phase brazing
YU Zhi-shui(于治水), LIANG Chao(梁 超), LI Rui-feng(李瑞峰),
WU Ming-fang(吴铭方), QI Kai(祁 凯)

Department of Materials Science and Engineering, East China Shipbuilding Institute, Zhenjiang 212003, China

Abstract:The brazing of Al2O3to Nb was achieved by the method of transient liquid phase (TLP) bonding. Ti foil and Ni-5V alloy foil were used as interlayers for the bonding. The base materials were brazed at 1 423 1 573 K for 1 120 min. The results show that the shear strength of the joint first increases and then decreases with increasing holding time and brazing temperature. The joint interface microstructure and elements distribution were investigated. It can be concluded that a composite structure, in which the base metals are solid solution Nb(V) and Nb(Ti) reinforced by Ni2Ti, is formed when the brazing temperature is 1 473 K and holding time 15 min, and a satisfactory joint strength can be achieved. The interaction of Ti foil and Ni-5V foil leads to the formation of liquid eutectic phase with low melting point, at the same time the combination of Ti come from the interlayer with O atoms from Al2O3results in the bonding of Al2O3 and Nb.

 

Key words: Al2O3ceramic; Nb; transient liquid phase bonding

ISSN 1672-7029
CN 43-1423/U

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