Tungsten and tungsten-carbon PVD multilayered structures as erosion-resistant coatings

Deposition and some properties of nanocrystalline, nanocomposite and amorphous carbon-based coatings for tribological applications

“…4b), the number and the size of grains ␤-WC 1−x , phase also decreases, which is confirmed by weak of reflexes coming from (2 0 0) and (3 1 1) planes of that phase. Moreover, an increase in carbon content leads to the strong deformation of the nanograins, and consequently to the amorphization of the coating [15]. Along with a decrease in tungsten content the volume of the amorphous a-C:H matrix in W-C:H coatings increases, like in case of Ti-C:H coatings.…”

“…Doped DLC coatings for example Ti-C:H coatings, depending on chemical and phase composition, can show very high hardness and a very low friction coefficient as well [1,2,8]. High hardness and wear resistance is distinctive feature of W-C:H coatings [3,5,14,15], whereas Si-C:H coatings are marked by stability of the friction coefficient in a wide range of changes in humidity [16,17].…”

Elastic stress analysis of bi-layered isotropic coatings and substrate subjected to line scratch indentation

“…Hard sputterdeposited WC layer has been combined with pure tungsten layers in bi-layer and multilayer structures. Bi-layered coatings of this type up to 60 m thick, produced by magnetron sputtering and composed of hard WC and ductile W layers, were found to be very promising erosion-resistant coatings for compressor blades in gas turbine engines (Harry et al, 1999;Quesnel et al, 1993).…”

“…In this way, the total stress and displacement fields are obtained from superposing the results of normal and tangential forces, so we have (Quesnel et al, 1993): xx = n xx P + T t xx , yy = n yy P + T t yy , xy = n xy P + T t xy , u = u n P + Tu t , v= v n P + Tv t where P is the normal load, T the tangential load and n and t refer to the solution of normal and tangential load, respectively.…”

Investigation of the Wear Resistance Properties of Cr/CrN Multilayer Coatings against Sand Erosion

“…Use of multilayer ceramic-metallic coatings like Ti/TiN [10,11], W/WN [12], Ti/TiB 2 [13], and TiAlN-X (Ti, Al, Cu) [8] has been previously studied in literature. Erosion rater of multilayer coatings was found to be much lower than for single layer coatings [12,14].…”