TWI Industrial Member Report Summary 612/1997
F J Blunt
Arc spraying with cored wires offers a cheap route to depositing hard coatings for wear resistance.
Few cored wires are available for arc spraying, and yet the arc spray process offers a very cost efficient method of applying coatings to rolls and other components subject to wear.
The cores are used primarily for the introduction of hard particles and alloying elements. These are incorporated in the coating during the spraying process either by mechanical mixing or by melting and alloying with the protective wire sheath. In this way it is possible to produce coatings with highly alloyed materials which would otherwise be difficult to spray due to their hardness and poor electrical conductivity, or coatings containing ceramic particles such as borides or carbides in a metal matrix.
In this work four cored wires, intended to produce hard coatings, were sourced. These were all based on an Fe-Cr wire, with cores containing any or all of C, Si, B, Mn, Ti and further Cr and Fe.
- To demonstrate the feasibility of using cored wire for arc spraying
- To determine the coating efficiency
- To determine the hardness and composition of the deposits