Chromium diffusion coatings

Abstract

pounds are formed within the diffusion layer, they may produce diffusion barriers or create brittle effects. Chromising has been practised as a highMost modern diffusion coatings are basically descendtemperature thermochemical diffusion coating process, primarily on steels but also on nickel and ants of traditional carburising and nitriding processes, cobalt based superalloys, for many years. The which have been used for at least 200 years, originally large accumulation of data in the literature relating as an art rather than a science. The origin of diffusion to both theory and industrial usage is reviewed.bonding can probably be found in ancient Egypt, Thermodynamic and kinetic approaches are relating to gold cladding on copper substrates. Conconsidered together with the coating thickness and sidering that metallic chromium became available structure required for high temperature protective only in 1789, all chromising operations are necessarily applications.IMR/311 more recent developments.

Evidence for a Cr metastable phase as a tracer in DLI-MOCVD chromium hard coatings usable in high temperature environment

“…Their drawback comes from the high working temperatures using traditional halides precursors. For instance, Cr metal coatings are deposited by pack cementation above 1300 K [11][12][13]. However, by using metalorganic compounds (MOCVD), the deposition temperature is significantly decreased, for instance below 773 K for Cr-based coatings depending on the precursor [14,15], and even at 523 K using reactive tetra-alkylchromium complexes [16].…”

Oxidation Resistance of a Cr0.50Al0.50N Coating Prepared by Magnetron Sputtering on Alloy K38G

“…With increasing operating temperatures of aircraft and marine turbine engines, various high-performance coatings have been developed, such as diffusion coatings [1,2], MCrAlY overlay coatings [3,4], modified diffusion coatings [5][6][7][8][9] and thermal-barrier coatings [10][11][12][13][14]. Overlay coatings were recently developed by Nicholls et al [15][16][17] to protect superalloys from various forms of hightemperature corrosion.…”

An Investigation of Tribological Properties of CN and TiCN Coatings

“…Alloy coatings and/or compound layers, which are produced when one element diffuses into the surface of a second element, can have excellent resistance to high-temperature oxidation and aqueous corrosion. [3] Wear resistance is the main application of engineered surface coatings. Wear tests can be conducted to rank the wear resistance of coatings to optimize coating selection or development for specific applications.…”