One of the most common alloys used in powder welding is Ni-B-Si (Nickel-Boron-Silicon), a self-fluxing alloy
. The presence of silicon and boron imparts efficient fluidity during the operation, and also helps in reducing the melting points of the powder welding cycle, which further allows powder welding operation at low temperatures.
As the coarsest cermet particles have larger sizes than the coarsest self-fluxing alloy ones, the loss of the cermet particles must be higher.
Addition of cermet particles to the FeCrSiB self-fluxing alloy allows to diminish its spallation and to decrease abrasive wear of the coating.
Sliding wear behaviour of laser clad coatings based upon a nickel-based self-fluxing alloy co-deposited with conventional and nanostructured tungsten carbide-cobalt hardmetals.
Wear resistant thermal sprayed composite coatings based on iron self-fluxing alloy and recycled cermet powders.
For HVOFS MMC coatings, Ni-based self-fluxing alloys (NiCrSiB) were found to be an optimal choice as the matrix material .
Composite coatings, produced by HVOF spraying on the basis of iron self-fluxing alloy powders with WC-Co reinforcement (ranging from 25 up to 50 vol%) were studied .
For comparison, the nickel self-fluxing alloy based coatings were studied and advantages of Fe-based coatings, reinforced by WC-Co hardmetal, were demonstrated considering the formation of structure with optimal properties (Fig.
Table 2 shows the chemical composition of the self-fluxing alloy powders of the powder composites.
Nickel- and iron-based self-fluxing alloy powder compositions, containing 25 wt% of hardmetal particles, were used.
NiCrSiB self-fluxing alloy forms a Ni-based matrix with WC hard particles (WC-Co hardmetal particles are practically dissolved in the Ni-based matrix).
Wide use of thermally sprayed coatings gives evidence of the cost-effectiveness of self-fluxing alloys containing tungsten carbide (WC) particles, applied by the spray and fusion methods (flame, plasma and laser fusion).