Room temperature impact-induced deposition of pure SiC coating layer by vacuum kinetic spraying

This study successfully manufactured a thick, pure SiC coating layer with a thickness of 83.3 μm using vacuum kinetic spray process and investigated the unique impact-induced deposition behavior at room temperature. The simulated result of SiC particle collides with the metallic matrix, or predeposited SiC layer confirmed that particle shock pressure could increase up to the maximum pressure of 27.2 GPa. Moreover, the particles were predicted to fracture to submicrometer size after plastic deformation and those characteristics also matched microstructural observations made with a transmission electron microscope. The SiC coating layer formed an unexpected microstructure composed of bent lattices, fractured submicrometer-sized particles, and amorphous layers. Correlating the microstructure and simulation results suggested that a pure SiC coating layer could be formed using mechanical anchoring and amorphous bonding at room temperature.