Formation of Intermetallic Phases in Functional Coatings Prepared by Cold Gas-Dynamic Spraying

Processes of intermetallic phase formation in functional coatings prepared by cold gas-dynamic spraying of Ni – Al, Ni – Ti – Al, Ti – Al, and Ni – Ti powder mixtures are studied. On heating of the coatings containing Al, the main phase transformations proceed in the range of 450 – 750°C, and phase formation processes in the coatings based on the Ni – Al and Ni – Ti – Al systems develop in a similar manner. Transformations do not develop in Ni – Ti coatings in the temperature range studied. Phase transformations in the coatings are identified.