Thermoreactive deposition/diffusion coating of chromium carbide by contact-free method

Tribological properties of CrN coatings deposited by nitro-chromizing treatment on AISI D2 steel

“…is deposited on the surface by a thermo-chemical process. These elements react with carbon, nitrogen and boron atom contained the substrate [11][12][13]. It has previously neither been reported in the literature (except our previous study [2]) how TRD CrN coating deposition, nor which coating parameters influence the resistance to wear by TRD method.…”

Influence of the thermo-chemical conditions on the carbo-chromization process of α-Fe matrices obtained by powder sintering technique

“…The treatment temperature and time were of 880 • C for 4 h and 980 • C for 12 h which resulted in samples with a low and high carburization depth. The carburized samples were further chromized in solid environment, using a mixture of ferrochromium powder (as chromium source), ammonium chloride powder (as activator) and alumina powder (introduced in the composition mixture to prevent the sintering of ferrochromium particles and their bonding to the sample surface) [9,10]. The mixture used for chromization had different proportions of ferrochromium (76 and 25%) and alumina (21 and 72%), while the NH 4 Cl (3%) remained constant.…”

“…Due to the limited diffusivity of chromium at low temperatures, the conventional chromization processes are usually carried out at temperatures around 1000 • C during 6-10 h [7,8]. Studies have revealed that the layers obtained by carburization followed by chromization consisted mostly of carbides with the following crystallographic structures: M 23 C 6 , M 7 C 3 , and M 3 C 2 [4,5,7,9]. However, the Fe-Cr-C layer properties depend strongly upon the process and the parameters (such as temperature, time, and atmosphere) of the thermochemical treatment.…”

Production of Chromium Boride Layers on Carbon Steel with Conversion Treatment: Chromium Deposition + Diffusion Annealing

“…The TRD coatings need very long treatment times at high temperatures. There are very common industrial methods that can be combined anyway to produce chromium boride coatings [7][8][9].…”