Improvement of the tribological behaviour of PVD nanostratified TiN/CrN coatings — An explanation

Thermal and mechanical stability of wurtzite-ZrAlN/cubic-TiN and wurtzite-ZrAlN/cubic-ZrN multilayers

“…Multilayered structures incorporating hard coating materials can be designed to improve the thermal stability [21][22][23], mechanical properties [24,25] and wear behavior [26,27]. For example, when sandwiching ZrAlN and TiN during very high temperature (900 °C) growth conditions, the multilayer architecture allows for growth of c-AlN in a c-ZrN matrix in the ZrAlN sublayers where c-AlN further transforms to w-AlN when exposed to mechanical stress [28].…”

“…For example, when sandwiching ZrAlN and TiN during very high temperature (900 °C) growth conditions, the multilayer architecture allows for growth of c-AlN in a c-ZrN matrix in the ZrAlN sublayers where c-AlN further transforms to w-AlN when exposed to mechanical stress [28]. The transformation is associated with a volume expansion that promotes crack closure and yields an enhanced fracture toughness of the coatings [27,29].…”

An Updated Review of the Fatigue Behavior of Components Coated with Thin Hard Corrosion-Resistant Coatings

“…(7). At 1x10 7 cycles, TiN coated specimens presented a significant drop in the fatigue maximum axial stress of 50%, while the loss was contained for CrN and WC:H DLC samples, with a 16.6% and a 5.5% reduction respectively. Coating maximum deposition temperatures were similar for the three processes (about 450 °C), but the heat load steps were varied according to the different coating procedures.…”

“…Typical values of elastic modulus of TiN can actually fall within the range 300-400 GPa [7,14]. It was pointed out that, regardless of the presence of the notch, the subsurface tensile stresses balancing out the residual stress distribution could have contributed to produce a localized plasticization underneath after the application of the bending load.…”

“…New literature has been added, particularly regarding Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD) application fields and new experimental results, thus giving the reader an enhanced view of the possibilities and the issues related to the adoption of these surface treatments over different substrates. The most typical applications of thin hard coatings include protection of cutting tools, cold and hot stamping and extrusion dies [2][3][4], due to the improvement in surface performance granted by these coatings in terms of hardness, wear and corrosion resistance properties [5][6][7][8][9][10][11][12]. Thin hard coatings can have a positive influence on the fatigue and the corrosion fatigue behavior of mechanical components, especially for relatively hard steel substrates [13][14][15][16][17][18][19][20][21][22][23].…”