Wear Performance of Thermally Sprayed and Welded Coatings Using Conventional and Nanostructured Materials

摘要

Welding and thermal spray processes have been widely used to minimize losses caused by wear mechanisms. Hardfacing and sprayed deposits using conventional wire and powder materials open a wide range of possibilities to solve wear problems in engineering equipment. More recently, the option for new different technologies and consumables like nano structured powder materials and nano composite cored wires have expanded the possibilities of engineering. Cored wire technology allows the use of compositions that can't be drawn into wire form like carbides in metallic matrix and high-temperature materials, thus intensifying the use of low operating cost welding and spraying processes to demanding wear applications. The objective of this work was to study the mechanical characteristics and wear performance of coatings obtained by GMA welding, Wire Arc and HVOF spraying using some selected powder and wire materials. The wear resistance of the coatings was determinate using the dry sand rubber wheel test following the ASTM G65 standard.