Study on distribution uniformity of hard phases in composite coating

Abstract

Five hard-phase aluminium-based composite coating types with volume fractions of 12.5%, 25%, 37.5%, and 50%, respectively, were used. The addition of a large hard phase enhanced the coating densification. An increase in hard-phase content in the coating distributes more uniformly, but when the hard-phase content is too high, the hard phase is more likely to agglomerate, which decreases the distribution uniformity. Therefore, all those with a 25% volume fraction had the best uniformity. The kinetic energy of the hard-phase particles affects the distribution uniformity by changing the deposition method. When the kinetic energy is small, particles cannot be deposited effectively (Al 2 O 3 -8). When the kinetic energy is large, the metal-based plastic flows to form a fracture belt, which reduces the distribution uniformity (WC-72). When the kinetic energy does not cause the deposition method to change, the uniformity of the hard-phase distribution is similar.

Effect of chromium–titanium on corrosion and erosion of HVOF coating

“…Second, it is also obvious to see a higher erosion wear rate with the increase in impact speed. An increase in impact speed results in a higher kinetic energy of the particles, which, in turn, leads to a fracture of coating materials [22]. Further, it can be seen that the erosion wear rate of Fe50Mo5C15Si10Cr10Ti10 is least followed by Fe60Mo5C15Si10Cr0Ti10, Fe60Mo5C15Si10Cr10Ti0, and SS 316L.…”