The object of this work was the deposition of a Ta-Hf-C thin film with a gold interlayer on stainless steel, via the physical vapor deposition (PVD) technique, in order to evaluate the properties of different systems subjected to micro-abrasive wear phenomena generated by alumina particles in Ringer's solution. The surface characterization was performed using a scanning electron microscope (SEM...

PVD diamond-like-carbon (DLC) coatings are finding increasing industrial acceptance in automotive, aerospace and medical applications due to their reduced friction and low wear coefficient. Very recently, High Power Impulse Magnetron Sputter (HIPIMS) sources have been shown to produce fluxes with very high metal ion fractions similar to those produced by arc evaporation sources, without showing...

The lubrication effect of solid-based materials has been recognized for centuries, but their use as lubricants dates back to only about 50 years. Solid are used in applications where parts operate under severe operating conditions such extreme temperatures and very high vacuum. replace liquid based operation environmental that beyond the capability a liquid-based lubricant or vacuum, cryogenic ...

In the present study, CrN, TiN and (Ti, Cr)N coatings were deposited on D6 tool steel substrates. Physical and mechanical properties of coatings such as microstructure, thickness, phase composition, and hardness were evaluated. Phase compositions were studies by X-ray diffraction method. Mechanical properties were determined by nano-indentation technique. The friction and wear behaviour of the ...

Wavelet Transform was applied to Acoustic Emission (AE) signals from Scratch Tests (ST) on stainless steel samples with Cr and Ti nitride surface coatings obtained by PVD. The implementetion of the signal processing method was aimed at characterizing the coating failure stages and evaluating the quality of and the differences between both type of coatings. In previous work we had identified dif...

Sol-Gel coatings are a good choice for protection and bioactivation of metals used as dentistry and standard surgical implant materials. These films should both prevent degradation of the substrates by wear or corrosion, and bioactivate the material for inducing the formation of a hydroxyapatite (HA) rich layer onto the material surface, thereby permitting a natural bonding to living tissues. T...

Plasma spray-physical vapor deposition (PS-PVD) is an emerging technology for the of uniform and large area coatings. As characteristics plasma jet are difficult to measure in whole chamber, computational fluid dynamics (CFD) simulations could predict temperature, velocity pressure fields. However, as PS-PVD generally operated at pressures below 500 Pa, a question rises about validity CFD predi...

PURPOSE To determine prevalence and associations of incomplete posterior vitreous detachment (PVD). METHODS The population-based cross-sectional Beijing Eye Study 2011 included 3468 individuals with a mean age of 64.6±9.8 years (range: 50-93 years). A detailed ophthalmic examination was performed including spectral-domain optical coherence tomography (SD-OCT). Incomplete PVD was differentiate...

The development of innovative ceramic tiles looks for materials with improved mechanical and tribological properties as well a higher corrosion resistance (high relative humidity, daily watering, household chemical cleaners). In addition, greater durability leads to lower environmental impact. Along their functionality recyclability, should also provide aesthetic properties. Ceramic can be trea...

OBJECTIVE To determine the role of hyperglycemia in prospective analyses of peripheral vascular disease (PVD) in type 2 diabetes, taking into account other potential risk factors. RESEARCH DESIGN AND METHODS Potential risk factors for the development of PVD were examined in 3,834 of 5,102 individuals enrolled in the U.K. Prospective Diabetes Study (UKPDS) without PVD at diagnosis of diabetes,...