Abstract: Ceramic/metal brazed assemblies are widely used in mechanical and electronic engineering, energy and chemical industry, aerospace and biomedical fields to make their respective advantages complementary to each other. However, the differences in interatomic bonds and thermal expansion coefficients between ceramics and metals make them hard to be jointed together reliably because of the poor wettability of ceramics and thermal residual stress produced during the brazing process in the ceramic/metal joints. This article overviews the research progress on the reactive wetting of the liquid metals on ceramics and the methods of redu-cing the residual stress levels in the joints. The interfacial reaction products, interfacial structure, reaction thermodynamics, reactive wetting and spreading dynamics models of active brazing alloy/ceramic systems are introduced. The stress relief methods of composite fillers and adding interlayer are summarized. The fundamental issues of reactive wetting and the disadvantages of current stress relief methods are discussed.
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2017, Vol. 31 
