Molybdenum-on-chromium dual coating on steel

Unique corrosion and wear resistant identification tags via LISI™ laser marking

“…CrB 2 was not detected, which suggests that this precursor compound melted completely during laser processing. The chromium rich borides Cr 2 B and CrB form during solidification, as suggested by Rajput et al in reference [27]. The XRD analysis does not show the presence of iron borides or chromium carbides, which is again in agreement with the findings of Rajput and co-workers [27].…”

“…The formation of undesirable defects, such as pores, or unwanted compounds, like brittle intermetallics, must be avoided. For instance, the powder mix used on a plain carbon steel surface will normally contain the following basic ingredients: Cr and Ni for corrosion resistance and carbides or borides for erosion and abrasion resistance [27]. When hard phase compounds such as carbides and borides are used, the LISI™ layer may present a cermet type microstructure of unmelted ceramic particles in a metallic matrix, as observed in cases where LISI™ processing was used to surface coat steel [28] and aluminum alloys [29,30].…”

Microstructure, Microhardness, Corrosion Resistance and Chemical Composition of Mo, B and Mo-B Coatings Produced Using Laser Processing

“…In [ 20 ] Cr-CrB 2 and Mo-MoB coatings were produced by plasma spraying and laser alloying. The authors found that Mo-based coating provides low friction coefficient, but unfortunately has a low microhardness.…”

“…Plasma sprayed coatings are porous and have low adhesion. Therefore, in this study [ 20 ], additional laser modification was used. Cr-CrB 2 and Mo-MoB coatings were applied on AISI 4130 steel by plasma spraying, and next remelted by laser beam.…”

Surface coatings obtaining by self-propagating high-temperature synthesis using concentrated solar irradiation

“…A layer of material of predetermined compositions is coated on the surface of the substrate to obtain a protective film which has good adhesion to the substrate surface. In some technologies a laser is used as an effective energy source for the preparation of coatings [3][4][5][6][7]. The Laser induced surface improve ment (LISI) technology is developed where a laser source is used to create an alloy layer on the surface of a material.…”