NiAl coatings on carbon steel by self-propagating high-temperature synthesis assisted with concentrated solar energy: mass influence on adherence and porosity

NiAl have been produced by a self-propagating high-temperature synthesis (SHS). The power source that ignite the SHS reaction is concentrated solar energy. NiAl coatings are obtained in few seconds and the processes are economic and environment friendly. Three different NiAl mass are tested: 0.3; 0.6 y 1.7 g. Coating porosity and adherence to substrate depends on the NiAl mass. Pores are large in samples with 1.7 g while the other specimens have small pores. Coating adherence is better when the amount of reactive powder is larger.