Investigation of the microstructure of Ni and B_4C ceramic-metal mixtures obtained by cold spray coating and followed by laser cladding

摘要

In the present work, a combined method is considered for the production of a metal-matrix composite coating based on Ni and B_4C. The coating is created by consistently applied methods: cold spray and laser cladding. Main focus of this work aimed to microstructure of coatings, element content and morphology of laser tracks. At this stage, the authors focused on the interaction of the laser unit with the substance without affecting the layer-growing technology products. It is shown that coating has deformed particles of nickel and the significantly decreased content of ceramic particles B_4C after cold spray. After laser cladding there are no boundaries between nickel and dramatically changes in ceramic particles.