Effect of Experimental Parameters on Wear Response of Thermally Sprayed Carbide Based Coatings

ABSTRACTThe present work has been carried out in order to investigate the sliding wear performance of a Ni-Cr based alloy, containing boron, carbon, silicon and iron, deposited onto a SAE 1045 steel substrate. The coatings were thermally sprayed by means of a High Velocity Oxy-Fuel system and post heat-treated for one hour at 760°C in an argon atmosphere. The relative sliding performance was evaluated under unlubricated dry conditions at different applied normal loads and sliding velocities, in order to analyze the influence of these parameters on the wear response. Test results are discussed and interpreted on the basis of both microstructural evaluations and mechanical properties measurements. The surface morphology and topography of the wear scars have been studied through of a Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques. The results have shown an improved wear resistance of the coated steel samples as compared to the uncoated ones.

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Examination of the lubricant storing and releasing ability of thermally sprayed surfaces

International Review of Applied Sciences and Engineering ◽

10.1556/irase.2.2011.2.4 ◽

2011 ◽

Vol 2 (2) ◽

pp. 101-105

Author(s):

L. Fazekas ◽

Z. S. Tiba ◽

G. Kalácska

Keyword(s):

Free Energy ◽

Surface Energy ◽

Surface Free Energy ◽

Essential Role ◽

Index Number ◽

Adhesion Ability ◽

Thermally Sprayed ◽

Proper Operation

Abstract The lubricant storing and releasing ability of the thermally sprayed surfaces plays an essential role in the proper operation of the components. In the case of porous sprayed surfaces the lubricant storing and releasing ability depends mainly on porosity and the surface energy (adhesion susceptibility). The adhesion ability can also be expressed indirectly with an index number that is by determining the surface free energy.

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The use of insoluble matter of Moroccan oil shale for removal of dyes from aqueous solution

10.31221/osf.io/x4v9p ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Methylene Blue ◽

Oil Shale ◽

Heating Temperature ◽

Blue Dye ◽

Adsorption Capacities ◽

Experimental Parameters ◽

Initial Ph ◽

New Material ◽

Activating Agent ◽

Moderate Cost

The study aims to use an adsorbent natural based of Moroccan oil shale of Timahdit area (Y layer) in a physical-chemical adsorption process for treating industrial discharges colorful. The used adsorbent is the insoluble party of the sub-critical extraction of decarbonized oil shale of Timahdit. The tests performed on the methylene blue (MB), showed a strong elimination in the first 10 minutes. The influences of various experimental parameters were studied: mass ratio of adsorbent, time and temperature of thermal treatment, contact time, pH of MB and heating temperature of solution on the parameters of material were studied. The experimental results have shown that the adsorption of methylene blue dye by the adsorbent is more than 90% at initial pH a range 6-7 at room temperature for 30 minutes. The process is simple and the adsorbent produced is a new material with interesting adsorption capacities of moderate cost which does not require an activating agent and can be used as industrial adsorbent for the decontamination of effluents containing organic pollutants.

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