CrN/NbN
Novel HIPIMS deposited nanostructured CrN/NbN coatings for environmental protection of steam turbine components
... growth extending from the base layer into the multilayer coating is also visible as grains of similar contrast are seen extending upward all the way to the top of the coating along the growth direction. These coating ...
37
Substrate finishing and niobium content effects on the high temperature corrosion resistance in steam atmosphere of CrN/NbN superlattice coatings deposited by PVD HIPIMS
... In Fig. 4, two representative cross-sections of the high Nb-CrN/NbN coatings but different substrate surface finishing are compared. PVD coating techniques is a line of sight process i.e. in order to coat a ...
15
CrN/NbN coatings deposited by HIPIMS : a preliminary study of erosion-corrosion performance
... Combined erosion-corrosion presents a serious issue for engineering components exposed to corrosive slurries. For example pump impellers, valves and nozzles which encounter corrosive solutions with suspended hard ...
17
CrN/NbN coatings deposited by HIPIMS: A preliminary study of erosion corrosion performance
... In previous studies [4], the nanoscale CrN/NbN multilayer coatings exhibited typical 'brittle' type erosion behaviour [18] with maximum mass loss for particles impacting at 90°. Hence in this study the ...
21
Deposition of nanoscale multilayer CrN/NbN physical vapor deposition coatings by high power impulse magnetron sputtering
... study, CrN/NbN coatings were synthesised in a sequence of three steps – pre-treatment, base layer deposition, and bulk coating deposition comprising of nanoscale multilayer ...of CrN was deposited ...
26
Performance of HIPIMS deposited CrN/NbN nanostructured coatings exposed to 650°C in pure steam environment
... P92 bare and coated samples were oxidised at 650 °C in 100% steam atmosphere up to 2000 h, in order to simulate the future operation conditions of steam turbines employed in power plants. The oxidation kinetics was ...
30
Analytical studies of corrosion and wear resistant CrN/NbN superlattice PVD coatings
... defects CrN/NbN nano-scale multilayer coatings even depo sited at low temperatures of 250 °C are able to enhance corrosion resistance of the coatings, as determined by a potentiodynamic polarisation ...
189
Enhancing the tribological properties of CrN/NbN nanoscale multilayer PVD coatings
... Figure 26 Basic wear mechanisms are a) adhesive, b) abrasive, c) fatigue and d) chemical wear............................................................................................................. - 43 - Figure 27 ...
212
Growth defects in CrN/NbN coatings deposited by HIPIMS/UBM techniques
... The aim of this study was to investigate the effect of surface defect density on the coatings deposited by two different physical vapour deposition approaches. One set of CrN/NbN coatings were produced ...
214
Effect of substrate bias voltage on defect generation and their influence on corrosion and tribological properties of HIPIMS deposited CrN/NbN coatings
... towards CrN/NbN multilayer coatings produced by physical vapour deposition (PVD) is growing rapidly due to their advanced barrier properties against corrosion and wear ...deposit CrN/NbN ...
37
Effect of chamber pressure on defect generation and their influence on corrosion and tribological properties of HIPIMS deposited CrN/NbN Coatings
... the CrN/NbN superlattice coatings are shown in ...nanoscale CrN/NbN coatings were of a single phase fcc ...for CrN coatings when the nitrogen percentage was varied ...
27
Long term behaviour of Nb and Cr nitrides nanostructured coatings under steam at 650°C Mechanistic considerations
... under the coating, contains principally Fe (29.0-32.0 at. %) and Cr (8.0-12.0 at. %) as well as other elements present in the substrate such as W and Mn, but in very small amounts (not shown in the element map). Likely, ...
25
Development of superlattice CrNNbN coatings for joint replacements deposited by High Power Impulse Magnetron Sputtering
... It is believed that the fatigue strength increase after coating deposition by HIPIMS can be attributed to two effects. The first effect is the increased compressive stress levels in the substrate surface due to the metal ...
26
Sputtered NbN Films on MS with Cr and EN Interlayer
... coatings, NbN was used as one layer ...and CrN/NbN [15] have been investigated for use as hard, wear resistant and corrosion protective ...resistance. NbN coatings with interlayer, however, ...
9
TRIBOLOGICAL BEHAVIORS OF PLASMA NITRIDED AISI 316 LN TYPE STAINLESS STEEL IN AIR AND HIGH VACUUM ATMOSPHERE AT ROOM TEMPERATURE.
... between CrN against CrN either purely or ...since CrN/CrN contacts avoid the strong adhesion between the contact ...of CrN coating peeled off from the pin contact surface ...the ...
10
Reliable spectrum sharing management for cognitive radio networks
... bands. CRN utilization of residual spectrum bands of Primary (licensed) Networks (PNs) must avoid harmful interference to the users of PNs and other overlapping ...proposes CRN Admission Control (CRNAC) ...
10
Corrosion of CrN Coated Steels in Liquid Pb Bi
... the CrN coating layer can be calculated using data of material properties on the simple assumption that only the thin CrN layer is stressed ...for CrN, 316SS and F82H, respectively. Young modulus of ...
7
Measurement of Radon Gas Concentrations in Tap Water Samples for Thi Qar Governorate Using Nuclear Track Detector (CR 39)
... Sample location, radon gas concentration CRn, mean of CRn, annual effective dose AED, radon exhalation rate RER and dissolved radon concentration in tap water Cd, for tap water samples i[r] ...
8
Study of Attacks and their Defence Methods in CRN : A Survey
... Defence Mechanism: Simplest mechanism [20] is to use threshold values for the radio parameters and if the parameters do not satisfy the thresholds the interaction is halted. Its limitation is that it depends on fixed ...
20