Effect of Erosive Particle Velocity on the Intensity of Polymeric Coating Wear

2010 ◽  
Vol 165 ◽  
pp. 91-96 ◽  
Author(s):  
Danuta Kotnarowska
Keyword(s):  
Experimental Investigation ◽  
Grain Size ◽  
Particle Velocity ◽  
Erosive Wear ◽  
Wear Intensity ◽  
Polymeric Coating ◽  
Degree Polynomial ◽  
Acrylic Coating ◽  
The Moment ◽  
Free Falling

The paper deals with experimental investigation of erosive wear of acrylic coating. The research was carried out on the erosive wear under the influence of alundum particles (grain size of 0.6 – 0.7 mm) striking the coatings at the angle of 45 degrees. It was established that intensity of the erosive wear (under the influence of free falling alundum particles) essentially depends on velocity of erosive particle at the moment of its impact against coating surface. For example, for the lowest velocity value (3.6 m/s) at the moment of impact, erosive wear intensity was equal to 0.4 mm/kg, while for the largest velocity value (5.3 m/s), the intensity doubled in magnitude. The characteristic of erosive wear intensity, depending on erosive particle velocity, was generated by using second-degree polynomial.

INFLUENCE OF CLIMATIC AGEING ON EROSIVE WEAR KINETICS OF POLYMER NANOCOATINGS

Tribologia ◽  
2018 ◽  
Vol 278 (2) ◽  
pp. 57-65 ◽  
Author(s):  
Danuta KOTNAROWSKA
Keyword(s):  
Grain Size ◽  
Silica Nanoparticles ◽  
Surface Topography ◽  
Erosive Wear ◽  
High Hardness ◽  
Wear Intensity ◽  
Alumina Nanoparticles ◽  
Polyurethane Coatings ◽  
20 Nm ◽  
Kinetics Of

The paper presents the results of erosive resistance investigation carried out on three-layer epoxy-polyurethane coating systems of different polyurethane top coat composition. Alumina nanoparticles with a grain size of 20 nm or silica nanoparticles with a grain size of 12 or 20 nm were applied for the top coat modification. Coating systems with top coats modified using silica nanoparticles with the grain size of 12 nm (nanocoatings) revealed the highest erosive resistance, whereas the lowest one was observed in the case of coating systems with unmodified top coats. Lower erosive wear intensity of nanocoatings follows on their relatively high hardness, as well as low surface roughness. Moreover, nanofillers contained in the top coat reduce the development of defects (pores, cracks) in its structure, increasing the erosive resistance of the coatings. Climatic ageing substantially influenced the formation of polyurethane coatings surface topography. Polyurethane coatings modified with nanofillers showed less change in their surface topography than did unmodified coatings. Therefore, the modification of polyurethane top coats with nanofillers decreases their surface susceptibility to destruction.

Experimental investigation on the moment-rotation performance of pultruded FRP web-flange junctions

2021 ◽  
pp. 109087
Author(s):  
Gisele G. Cintra ◽  
Daniel C.T. Cardoso ◽  
Janine D. Vieira ◽  
Thomas Keller
Keyword(s):  
Experimental Investigation ◽  
The Moment

The Use of Closely Spaced Vickers Indentations to Model Erosion of Polycrystalline α-Al2O3

2004 ◽  
Vol 843 ◽  
Author(s):  
Adolfo Franco Júnior ◽  
Steve G. Roberts
Keyword(s):  
Grain Size ◽  
Impact Velocity ◽  
Erosive Wear ◽  
Significant Loss ◽  
Crack Coalescence ◽  
Good Correspondence ◽  
Mean Grain Size ◽  
Static Indentation ◽  
Α Al2o3 ◽  
Wear Maps

ABSTRACTArrays of closely spaced quasi-static indentation were made on specimens of polycrystalline α-Al2O3, mean grain size G=1.2, 3.8 and 14.1 μm. The critical indentation spacing to produce crack coalescence between indentations, and thus significant loss of material from the surface, was determined. These data are compared to results for low-impact-velocity wet erosive wear on the same materials; a good correspondence is found. The indentation data can be used to produce “wear maps”, which provide a guideline for predicting the low-impact-velocity erosive wear resistance of brittle materials.

Experimental Investigation of Dust Amount from Free Falling Particle Stream Effected by Deflector Curvature of Dust Suppression

2013 ◽  
Vol 864-867 ◽  
pp. 1789-1792 ◽  
Author(s):  
Ze Qin Liu ◽  
Zhen Jing Wu ◽  
Ze Peng Feng
Keyword(s):  
Experimental Investigation ◽  
Dust Control ◽  
Emissions Reduction ◽  
Fugitive Dust ◽  
Bulk Materials ◽  
Dust Suppression ◽  
Suppression Effect ◽  
Particle Stream ◽  
Free Falling ◽  
The Relationship

This paper focuses on the study of the curvatures of deflector installed on the below receiving device to effect the dust amount from the free falling particle stream. The deflector curvature was artificially controlled to limit the fugitive dust direction which was generated by the collision between the free falling bulk materials and the receiving device. This method was used to improve efficiency of the dust control system to exhaust fugitive dust, and to achieve the targets of energy conservation and emissions reduction. The experimental method was adopted to explore the relationship between the deflector curvature and the producing dust quantity. The experimental results indicated that, the dust suppression effect containing deflector contained a certain radian was more remarkable, when the height of the free falling of bulk materials was constant. The producing dust quantity decreased slightly with the deflector curvature increasing, and then increased rapidly. When the deflector curvature was 0.045 cm-1 or 0.060cm-1, the minimum of producing dust quantity could be obtained, and the dust removal effect might be significant.

scholarly journals The influence of surface finishing of Paulownia Siebold et Zucc. on the mechanical properties of lacquered surface

2010 ◽  
pp. 7-23
Author(s):  
Milan Jaic ◽  
Jovan Dobic ◽  
Tanja Palija
Keyword(s):  
Mechanical Properties ◽  
Abrasion Resistance ◽  
Scratch Resistance ◽  
Surface Finishing ◽  
Coating Application ◽  
Acrylic Coating ◽  
Acrylic Coatings ◽  
Paulownia Fortunei ◽  
Free Falling ◽  
Paulownia Elongata

This paper presents the research of influence of sanding, staining and the use of polyurethane and acrylic coating on the adhesion, scratch resistance and abrasion resistance of the coating. Objective was to determine the most important mechanical properties of lacquered surfaces, considering the application of Paulownia elongata and Paulownia fortunei, by using different systems of surface finishing. Cross cut method was used for measurement of adhesion. More accurate view of coating adhesion was obtained by measuring the scratch resistance. Abrasion resistance was tested by the method of free falling of abrasive particles. The applied system of sanding had no effect on the examined mechanical properties. Stained samples lacquered with PU coating showed better adhesion to the non-stained samples. Impact of staining on scratch resistance is not established. Stained samples showed greater resistance to abrasion for both wood species. Samples lacquered with PU coating showed the higher values of mechanical properties compared with samples lacquered with UV acrylic coating. Application of PU coating for surface finishing of Paulownia elongata and Paulownia fortunei is more adequate than the application of UV acrylic coatings, from the point of scratch resistance and abrasion resistance.

Numerical Simulation of Particulate Jet Generated by Free Falling Particles

2003 ◽  
Author(s):  
Tomomi Uchiyama
Keyword(s):  
Numerical Simulation ◽  
Particle Velocity ◽  
Single Particle ◽  
Maximum Velocity ◽  
Vortex Method ◽  
Solid Particles ◽  
Airflow Rate ◽  
Two Dimensional ◽  
Free Falling ◽  
Free Turbulent Flow

This paper is concerned with the numerical simulation of the particulate jet generated by solid particles falling from a slit orifice into an unbounded quiescent air. A two-dimensional vortex method, proposed for the analysis of particle-laden free turbulent flow in prior papers, is employed for the simulation. The falling particles induce complicated airflow involving eddies with a wide variety of scales. The air takes its maximum velocity at the jet centerline. The particle velocity is higher than the free falling velocity of a single particle. The effects of the diameter and density of the particle on the flow are investigated. The entrained airflow rate is favorably compared with the value predicted by an analytical model.

scholarly journals An experimental investigation on the effect of grain size on oil-well sand production

2012 ◽  
Vol 9 (3) ◽  
pp. 343-353 ◽  
Author(s):  
Vahidoddin Fattahpour ◽  
Mahdi Moosavi ◽  
Mahdi Mehranpour
Keyword(s):  
Experimental Investigation ◽  
Grain Size ◽  
Oil Well ◽  
Sand Production

AN INVESTIGATION OF THE INFLUENCE OF CLIMATIC FACTORS ON THE EROSIVE WEAR KINETICS OF POLYMER COATINGS

Tribologia ◽  
2016 ◽  
Vol 268 (4) ◽  
pp. 115-125
Author(s):  
Danuta KOTNAROWSKA ◽  
Andrzej KOTNAROWSKI
Keyword(s):  
Grain Size ◽  
Climatic Factors ◽  
High Surface ◽  
Surface Hardness ◽  
Surface Profile ◽  
Erosive Wear ◽  
Epoxy Coatings ◽  
Mean Grain Size ◽  
Resistance Decrease ◽  
20 Nm

The paper presents investigation results concerning the influence of the modification with nanoparticles of silica (of mean grain size 12 nm or 20 nm) or aluminium trioxide (20 nm) of the structure of epoxy coatings on their resistance to climatic factors and the action of erosive particles. Epoxy coatings aged in natural climatic conditions showed an erosive resistance decrease with ageing. The erosive resistance decrease was accompanied by a hardness decrease as well as surface roughness increase. The highest resistance to erosive wear after 3 years of ageing revealed coatings modified with aluminium trioxide nanoparticles, while the lowest one showed coatings modified with silica nanoparticles of 12 nm mean grain size. Nanocoatings modified with aluminium trioxide nanoparticles also had the highest resistance to ageing; which was proven by the lowest increase of Ra and Rz surface profile parameter values with time, as well as by a high surface hardness, which was higher than hardness of new unmodified coatings.

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