Overlay welding of NiSiB mixes with tungsten carbides
Metal-matrix composite coatings consisting of a nickel based metal matrix and tungsten carbides are commonly used for hardfacing of components requiring resistance to abrasive wear. The nickel based matrix works as a binder providing toughness while the tungsten carbides provide wear resistance. The properties of metal matrix composite coatings depend on the volume fraction of carbides in the clad but also on the shape, particle size and microstructure of the carbide particles, the chemistry of the matrix material and the process parameters selected. In this paper, the properties of laser cladded and PTA welded nickel based coatings with different amounts of tungsten carbides are investigated.