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

Uses of Concentrated Solar Energy in Materials Science

“…The heat released (combined with that of the solar beam) melts the compound obtained, resulting in a dense non-sinterized material. This process was optimised by Sierra and others (Sierra & Vázquez, 2005), where the adherence of the coating to the substrate was improved through the electrodeposition of a nickel layer prior to the treatment. The study carried out with the Fresnel lens of the ETSII-UCLM used elemental Ni and Al powders and resulted in adherent NiAl coatings over cast iron.…”

Dry sliding wear behaviour of nickel aluminides coatings produced by self-propagating high-temperature synthesis

“…Simultaneously to this reaction a visible combustion wave is produced showing how the reactive conversion into the final product takes place [11][12][13][14]. High concentrated solar radiation achieved at the focus of the Fresnel lens installed at CENIM [15] is high enough for producing NiAl coatings on carbon steel pieces from a nickel and aluminium mixture by SHS [16][17][18]. The combination of SHS and concentrated solar radiation results in a simple, fast, low cost and environment friendly process for the production of NiAl and other intermetallic coatings.…”

The evaluation of NiAl- and TiAl-based intermetallic coatings produced on the AISI 1010 steel by an electric current-activated sintering method

“…It is possible that the diffusion of iron into the coating formed a metallurgical bond between the coating layer and the substrate. Sierra and Vazquez [7] have reported that Fe diffuses to the interface in NiAl coatings produced by a self-propagating high-temperature synthesis (SHS) implemented on a steel substrate. In the present study, TiAl-coated samples, iron atoms diffuse to the coating layer from the matrix, and Al atoms diffuse to the steel substrate matrix from the powder mixture.…”

“…If NiAl and TiAl coatings on carbon steel are obtained, the oxidation and corrosion resistance, as well as the substrate, will be improved. Currently, the coatings can be obtained with techniques such as Physical Vapour deposition (PVD) [5,6], the self-propagating high temperature method [7], the mechanical alloying method [8], and the high velocity oxygen-fuel (HVOF) thermal spraying [1].…”