scholarly journals Abrasive wear resistance of selected woods

2017 ◽  
Vol 63 (No. 2) ◽  
pp. 91-97
Author(s):  
Brožek Milan
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Sweet Cherry ◽  
Sour Cherry ◽  
Wear Intensity ◽  
Horse Chestnut ◽  
Silver Fir ◽  
Abrasive Particles ◽  
Volume Weight ◽  
Pin On Disk

In this contribution, the results of the wear resistance study of 10 sorts of wood (apple, aspen, beech, hornbeam, horse-chestnut, London plane, mahogany, silver fir, sour cherry and sweet cherry) are published. The laboratory tests were carried out using the pin-on-disk machine when the abrasive clothes of three different grits (240, 120 and 60) were used. The wear intensity was assessed by the volume, weight and length losses of the tested samples. From the results of the carried out tests it follows that the wear resistance of different woods is different. It was proved that the wear resistance of different woods depends on the abrasive particles size, too. Also the technical-economical evaluation was part of the carried out tests. It was univocally proved that at the intensive abrasive wear using the abrasive cloth the best results were shown by hard woods, e.g. apple, beech or mahogany. Soft woods, e.g. horse-chestnut, silver fir or sweet cherry, are cheap, but their wear is bigger compared to hard woods.

Investigation of the Wear Behavior of AA6082 Against Different Counterparts

2021 ◽  
Author(s):  
Safiye İpek Ayvaz ◽  
Mehmet Ayvaz
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Specific Wear Rate ◽  
Pin On Disk ◽  
Disk Method ◽  
Sliding Distance ◽  
Oxidation Wear

In this study, the effect of different counterparts on the wear resistance of AA6082 aluminum alloy was investigated. In tests using pin-on-disk method, 6 mm diameter Al2O3, 100Cr6 and WC-6Co balls were used as counterparts. The tests were carried out using 500 m sliding distance and 5N load. The lowest specific wear rate was measured as 7.58x10-4 mm3/Nm in WC-6Co / AA6082 couple, and the highest value was measured as 9.71x10-4 mm3/Nm in 100Cr6/AA6082 couple. In the Al2O3/AA6082 couple, the specific wear rate of the AA6082-T6 sample was determined as 8.23x10-4 mm3/Nm.While it was observed that the dominant wear type in the 100Cr6/AA6082 pair was abrasive wear, oxidation wear and oxide tribofilm were detected in the WC-6Co/AA6082 and Al2O3/AA6082 couple besides the abrasive wear.

The Effect of Processes Parameters on the Abrasive Wear Resistance of Boronized AISI 1050 Steel

2016 ◽  
Author(s):  
Mete Han Boztepe ◽  
Melih Bayramoglu
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Mesh Size ◽  
High Hardness ◽  
High Strength ◽  
Constant Load ◽  
Abrasive Wear Resistance ◽  
Wear Testing ◽  
Wear Properties ◽  
Pin On Disk

Boronizing is one of the thermochemical surface treatment processes which is extensively used to obtain excellent mechanical properties such as high strength, very high hardness, good toughness and fracture toughness. In this study, AISI 1050 steel specimens have been subjected to pack boronizing process by using Ekabor 2 powder within the stainless steel seal container. The experiments were carried out at temperatures of 800 °C, 850 °C and 900 °C for 3, 6 and 9 hours to investigate the effect of these parameters on the wear resistance of boronized specimens. Pin-on-Disk wear testing is used to characterize wear properties of boronized specimens. Wear tests were performed at dry conditions under constant load of 30 N by using 220 mesh size Al2O3 abrasive paper. Different rotating speeds of the pin-on disk were selected as 300, 600, 900, 1200, 1500 revolutions for each of the test specimens. After the abrasive tests, weight losses of the specimens were measured to determine the abrasive wear resistance of boronized specimens. The results were also compared with unboronized and conventional hardened AISI 1050 steel specimens respectively.

Role of Micro- and Nanofillers in Abrasive Wear of Composites Based on Ultra-High Molecular Weight Polyethylene

2014 ◽  
Vol 1040 ◽  
pp. 148-154 ◽  
Author(s):  
Sergey Panin ◽  
Lyudmila А. Kornienko ◽  
Nguyen Xuan Thuc ◽  
Larisa R. Ivanova ◽  
Sergey V. Shilko
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Sliding Friction ◽  
Abrasive Wear Resistance ◽  
Dry Sliding ◽  
Cu Nanoparticles ◽  
Abrasive Particles ◽  
Ultra High Molecular Weight ◽  
Fixed Abrasive

The abrasive wear of pure UHMWPE as well as one filled with nanoand microparticles (fibers) were investigated. It was found that abrasive wear resistance of microcomposites (containing AlO(OH) and Al2O3microparticles) can grow up by 16-18 times in comparison with pure UHMWPE depending on the strength and size of the filler as well as abrasive grit. Nanofillers (AlO(OH) and carbon nanofibers (CNF) as well as SiO2and Cu nanoparticles) as opposed to microfillers can improve abrasive wear resistance of UHMWPE in a significantly less degree (up to 50 %). Abrasive wear resistance of nanocomposites weakly depends on the type of filler and is defined by the polymeric matrix (permolecular) and counter-face abrasive grit. The comparative analysis of the wear mechanisms of UHMWPE based micro-and nanocomposites under abrasive wear (fixed abrasive particles) and dry sliding friction is carried out.

ANALYTICAL ASSESSMENT OF WEAR OF THE WORKING SURFACE OF SCREW DEVICES WITH COMPOSITE COATING

2021 ◽  
Vol 2 (143) ◽  
pp. 151-160
Author(s):  
Sergey Yu. Zhachkin ◽  
◽  
Nikita A. Pen’kov ◽  
Oleg A. Sidorkin ◽  
Roman N. Zadorozhniy ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Contact Surface ◽  
Operating Conditions ◽  
Research Purpose ◽  
Screw Conveyor ◽  
Linear Wear ◽  
Abrasive Particles ◽  
Processed Material ◽  
Agricultural Materials

Equipment for the production and transportation of bulk agricultural materials operates under extremely difficult operating conditions, is exposed to abrasive particles of the processed material. Such working conditions lead to changes in operational properties, deterioration of the technical condition of the equipment and the occurrence of malfunctions, which are expressed in changes in the original shapes, sizes, weight, structure of the material and mechanical properties. (Research purpose) The research purpose is to predict the performance of composite coatings using a mathematical apparatus that adequately describes the process of abrasive wear of the contact surface of the grain conveyor auger when working with abrasive particles of the processed material. (Materials and methods) As a sample for modeling the process of surface wear, authors chose a screw conveyor, the working screw surface of which is treated with plasma spraying in order to increase its wear resistance. The screw works in an abrasive environment, without touching by the contact surface with other bodies. External abrasive wear is characterized by the presence of scratches or cavities oriented in the direction of sliding. The article presents the model of abrasive wear of the grain conveyor screw and numerical methods of its calculation. (Results and discussion) The article describes a method for assessing the wear resistance of restored shafts by determining the wear intensity of the surface of the part and the energy intensity of linear wear for parts with non-stationary geometry. The article presents a method for calculating the shape and contact area of composite particles with the recovered surface. The obtained expression is valid when ensuring the deviation of the screw speed during the test from the nominal one, not exceeding 10 percent of the set value, the error of applying the load on the screw does not exceed 5 percent. (Conclusions) As a result of the study, the article presents the dependence of the intensity of abrasive wear as a function of the geometry of the surface to be restored and the density of the applied material.

scholarly journals Effect of carbide size in hardfacing on abrasive wear

2009 ◽  
Vol 55 (No. 4) ◽  
pp. 149-158 ◽  
Author(s):  
R. Chotěborský ◽  
P. Hrabě ◽  
M. Müller ◽  
R. Válek ◽  
J. Savková ◽  
...  
Keyword(s):  
Abrasive Wear ◽  
Abrasive Wear Resistance ◽  
Abrasive Particles ◽  
X Ray ◽  
Carbide Phases ◽  
Carbide Size ◽  
The Matrix ◽  
Pin On Disk ◽  
Carbide Particles ◽  
Measured Hardness

Abrasive wear of high alloyed overlay materials with high contents of carbide phases of M<sub>7</sub>C<sub>3</sub> depends on the sizes of the carbide particles and on their distribution in an overlay. This work is focused on the study of the carbide particles size effect on abrasive wear. The size of carbide particles of M<sub>7</sub>C<sub>3</sub> type, their distribution (part) in the matrix and their effect on abrasive wear were measured. Hardness in single layers, as well as microhardness of the matrix and of carbide particles, were also measured. The abrasive wear resistance was measured using the pin-on-disk machine with bonded abrasive particles. For the study of the chemical composition, the scanning electron microscopy with energy dispersive X-ray analysis (EDX) was used.

Wear Resistance of Experimental Hard Alloys Grades with Co-Mo-Ti Binders upon Conditions of Friction without Lubricant on Stainless Steel

2021 ◽  
Vol 1037 ◽  
pp. 522-527
Author(s):  
Evgeny V. Fominov ◽  
Maxim S. Egorov ◽  
Denis V. Moiseev ◽  
E. Dieudonne ◽  
Constantine G. Shuchev
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Normal Load ◽  
Wear Intensity ◽  
Partial Substitution ◽  
Hard Alloys ◽  
Adhesive Interaction ◽  
Volume Wear ◽  
Shielding Properties ◽  
Pin On Disk

The results of studies of wear resistance and tribological properties of experimental single carbide hard alloys grades with modified Co-Mo-Ti binders upon conditions of friction without lubricant on stainless steel are presented. All the data obtained were compared with similar parameters for the basic alloy VK8 (Co-Mo), on the basis of which the experimental grades were developed. Tribological tests were performed on tribometer which implemented a scheme of friction "pin on disk" at constant sliding speed and normal load values with artificially heated tribo contact zone. Studies have found that partial substitution of cobalt in a binder by Mo and Ti has led to a decrease in average friction rates. It was established that the greatest wear resistance and the best tribological characteristics were obtained for specimens of experimental grade 2.22 (5,65%Co+1,8%Mo+0,6%Ti). The process of friction for this pin material was characterized by the formation of secondary structures with high shielding properties, reducing of the adhesive interaction of materials, low volume wear intensity, minimal friction coefficient, as well as the least roughness of friction tracks on the counter body (disk). An increase in the proportion of molybdenum in the binder of more than 5% reduced the wear resistance of the experimental grades in comparison with the basic alloy VK8.

Wear Behavior of Plasma Sprayed Ni-WC Composite Coatings

2007 ◽  
Vol 336-338 ◽  
pp. 1731-1733
Author(s):  
Chong Gao Bao ◽  
Yi Min Gao ◽  
Jian Dong Xing ◽  
Guo Shang Zhang
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Abrasive Wear ◽  
Composite Coating ◽  
Wear Behavior ◽  
Pull Out ◽  
The Matrix ◽  
Three Body ◽  
Pin On Disk ◽  
Plasma Sprayed

Seal materials often lose their effectiveness due to the wear of surface under the combined effect of environment and load. In this research, a metallurgical bonding composite coating reinforced with nickel -coated tungsten carbide (Ni -WC) particles was produced on 40Cr carbon steel substrate by plasma sprayed. The bond strength of the coating/substrate interface and the tensile strength of the coating itself reached 260–330 and 100–132MPa, respectively. Effects of Ni and WC contents on the wear behavior of the coating have been systematically investigated at two different wear conditions, namely the high stress pin-on-disk abrasion and three-body abrasive wear. The results show that the higher the Ni content in the coating, the lower the hardness and wear resistance. In stress pin-on-disk abrasive wear, the mass percent of Ni in the coating having the lowest wear amount was 40%, and which was 60% in three-body abrasion. In view of the above, the WC reinforcement of the composite coating plays an important role in protecting the matrix from being worn-out, whereas in the abrasive wear, the wear mechanism is mainly controlled by the scratching and micro-cutting of the matrix followed by the pull out of WC particles due to the scratching action of abrasives. The wear resistance of the 40Cr carbon steel composite coating (Ni -WC) is better than that of the flame overlaid coating.

ABRASIVE WEAR BEHAVIOR OF WC REINFORCED Ni-BASED COMPOSITE COATING SPRAYED AND FUSED BY OXY-ACETYLENE FLAME

2009 ◽  
Vol 16 (03) ◽  
pp. 475-485 ◽  
Author(s):  
QUN WANG ◽  
ZHENHUA CHEN ◽  
ZHANG XIONG DING ◽  
DING CHEN
Keyword(s):  
Electron Microscopy ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Composite Coating ◽  
Wear Behavior ◽  
Homogeneous Microstructure ◽  
Abrasive Particles ◽  
X Ray ◽  
The Matrix ◽  
Abrasive Wear Behavior

Microstructure of WC reinforced Ni -based self-fluxing alloy composite coating sprayed and fused by oxy-acetylene flame was investigated by scanning electron microscopy and energy dispersive X-ray Spectrometry, X-ray diffraction, and transmission electron microscopy. The wear performance of the coating was studied by a MLS-225 wet sand rubber wheel abrasive wear tester at various loads and sizes of abrasive particles. Also, the wear resistance of the coating was compared with uncoated ASTM1020 steel. The results indicated that the coating is bonded metallurgically to the substrate and has a homogeneous microstructure composed of both coarse WC and fine carbide and boride grains such as Cr 7 C 3, Cr 23 C 6, and Ni 2 B which disperse uniformly in the matrix of γ- Ni solid solution and Ni 3 B . The worn mass loss of the coating and ASTM1020 steel both increased with the load and size of abrasive particles, also, the coating has exhibited excellent abrasive wear resistance compared with ASTM1020 steel.

scholarly journals Influence of Chromium Concentration on the Abrasive Wear of Ni-Cr-B-Si Coatings Applied by Supersonic Flame Jet (HVOF)

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 915
Author(s):  
Mara Kandeva ◽  
Zhetcho Kalitchin ◽  
Yana Stoyanova
Keyword(s):  
Wear Resistance ◽  
Thermal Treatment ◽  
Composite Coatings ◽  
Research Work ◽  
High Hardness ◽  
Wear Intensity ◽  
Chromium Concentration ◽  
Preliminary Thermal Treatment ◽  
Cr Concentration ◽  
Pin On Disk

This research work studies the characteristics of wear and wear resistance of composite powder coatings, deposited by supersonic flame jet (HVOF), which contain composite mixtures Ni-Cr-B-Si having different chromium concentrations—9.9%, 13.2%, 14%, 16%, and 20%, at one and the same size of the particles and the same content of the remaining elements. The coating of 20% Cr does not contain B and Si. Out of each powder composite, coatings have been prepared without any preliminary thermal treatment of the substrate and with preliminary thermal treatment of the substrate up to 650 °C. The coatings have been tested under identical conditions of dry friction over a surface of solid, firmly-attached, abrasive particles using tribological testing device “Pin-on-disk”. Results have been obtained and the dependences of the hardness, mass wear, intensity of the wearing process, and absolute and relative wear resistance on the Cr concentration under identical conditions of friction. It has been found out that for all the coatings the preliminary thermal treatment of the substrate leads to a decrease in the wear intensity. Upon increasing Cr concentration the wear intensity diminishes and it reaches minimal values at 16% Cr. In the case of coatings having 20% Cr concentration, the wear intensity is increased, which is due to the absence of the components B and Si in the composite mixture, whereupon no inter-metallic structures are formed having high hardness and wear resistance. The obtained results have no analogues in the current literature and they have not been published by the authors.

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