Wetting And Interfacial Interaction In Ticrc-Ni System

Wetting and interfacial interaction between the titanium-chromium carbide and molten nickel were investigated by sessile drop technique in vacuum environment at a temperature of 1500 degrees C. Molten nickel shows excellent wetting of TiCrC, forming the contact angle theta = 8 degrees. The interfacial interaction in the TiCrC-Ni system involves the dissolution and infiltration of the ceramic substrate along grain boundaries with Ni to a depth of 400600 mu m. The diffusion of Ti, Cr, and C from the ceramic substrate into molten nickel leads to a change in the chemical composition of the drop. Upon cooling, the recrystallization of titanium and chromium carbides occurs with the formation of new phases TiCx-Cr, Cr3C2-Ti and Cr7C3-Ni-Ti in the drop and the interaction zone. Thus, the TiCrC ceramics can be successfully used to develop the cermets in combination with Ni as a matrix or binder. However, in the manufacture of composite materials TiCrC-Ni, it is necessary to take into account the interaction between TiCrC and Ni with a subsequent change in their chemical composition.