AbstractSputtered MoS2 coatings have been mostly used as a solid lubricant. In this investigation, MoSx/Ni composite coatings with Ni contents varying from 0 to 22 % were deposited onto steel substrate using a DC magnetron sputter process. The MoS2/Ni ratio in the coatings was controlled by sputtering the composite targets. The composition, microstructure, and mechanical properties of the...

Total joint replacements are one of the most commonly performed orthopaedic procedures worldwide, with over 700,000 surgeries performed annually in the US to treat arthritic conditions of the hip and knee. One of the major complications of total joint replacement is implant wear and osteolysis, a process that involves continuous shedding of micronand submicron-sized particles from implant compo...

In this study, the effects of passes number and cooling during friction stir processing (FSP) on the microstructure and properties of AZ31 magnesium alloy has been investigated. The process was carried out at tool rotational speed, transverse speed and tool tilt angle of 1100 rpm, 52 mm/min, and 3°, respectively. Cooling was performed by water. The microstructure of FSPed samples was explored b...

The use of Fe-Al intermetallic compound coatings has been investigated in order to improve the tribological behaviour of carbon tool steel. The coatings were formed by a pack cementation process and subsequently diffusion annealing at 900˚C in an argon controlled atmosphere. The optimum diffusion time was selected on the basis of optimum thickness and tribological behaviour. The microstructure...

Dimensional Discrepancies Overrolling of Debris Corrosion Other Fatigue Absrrucr-The development of an in-line, full flow oil debris sensor for aircraft engine condition assessment is described. First used on the F22 fighter, this sensor is the only “ all-metals” debris detector in production. The sensor is based on an inductive measurement technique which enables the system to detect, count an...

High-entropy alloys (HEAs) are promising structural materials due to their excellent comprehensive performances. The use of mechanically alloyed powders to deposit HEA coatings through atmospheric plasma spraying (APS) is an effective approach that can broaden the application areas of the HEAs. In this paper, a ductility-brittleness AlCoCrFeNiSi system was chosen as an object of study, and the ...

mo40 low-alloy steels are mostly used to produce industrial components such as crane wheels whichare exposed to abrasive wear. however, during working conditions, their wear resistance is reduced aftera while due to its low hardness. with increasing abrasive wear, the dimensions of components decreaseand they need to be repaired for surface modification. in this regard, hard overlay coatings ar...

Sliding wear of nanocrystalline Ni-W alloys with grain sizes from 3 to 45 nm, a range which spans the transition in deformation mechanisms from intrato intergranular, is studied through pin-on-disk wear testing. The extreme conditions produced during sliding wear are found to result in structural evolution and a deviation from Archard scaling for the finest grain sizes; in the finest nanocrysta...

The Ni-based coatings with different content of spherical tungsten carbide were deposited by plasma transfer arc welding (PTAW) method on 304 austenitic stainless steel sheets in this study. The microstructure and wear property of spherical tungsten carbide particle reinforced composite coatings were investigated by means of optical microscope, scanning electron microscope (SEM), X-ray diffract...