scholarly journals CORRELATION OF BEARING FRICTION ASSEMBLIES WITH ABRASIVE WEAR OF THEIR TRIBO-COUPLING

2016 ◽  
Vol 2016 (2) ◽  
pp. 36-40 ◽  
Author(s):  
Сергей Шец ◽  
Sergey Shets ◽  
Владимир Сакало ◽  
Vladimir Sakalo ◽  
Анатолий Суслов ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Rolling Motion ◽  
Shaft Seal ◽  
Resistance Increase ◽  
Environment Temperature ◽  
Bearing Assembly ◽  
Friction Assemblies ◽  
Bearing Friction

To ensure wear resistance of all tribo-couplings of a bearing assembly at the expense of the abrasive wear decrease it is necessary the solution of problems connected with the impermeability of their movable joints. In this case by the impermeability we imply a process of sealed “wall” formation which is able to separate reliably volumes with different environments at considerable changes of external factors of environment: temperature, dustiness, aggressiveness and others. The contact of two hard surfaces of tribo-coupling of the “shaft-seal” type forms a system of cavities, capillaries of an arbitrary shape and contact patches. Under the action of pressure difference on separate capillaries arise leaks. The depressurization of bearing friction assemblies (leak moment) results in the decrease of wear rate of tribo-coupling of “shaf-tseal” type, but a wear rate of other tribocouplings such as “ringsolid of rolling motion”, for frictionless bearings or “shaft-bushing” for friction bearings increases because of abrasive penetration into a contact area. The penetration of quartz particles (pollutions) through a sealing into a bearing assembly results in the increase of a constant of friction and initiation of abrasive wear in tribocouplings of “ringsolid of rolling motion” and “shaftbushing” types. The wear rate of “ringsolid of rolling motion” and “shaftbushing” couplings depends on the abrasive concentration in lubricant and a leak at the outlet from the bearing assembly. For the wear resistance increase in tribo-couplings of bearing assemblies it is necessary not only to increase the hardness of contact surfaces, ensure optimum roughness, select materials in tribo-couplings, but also to ensure the impermeability and lubricant keeping in a friction area.

Increasing in wear resistance of excavating machine elements

2020 ◽  
pp. 306-308
Author(s):  
V.S. Bochkov
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Thermomechanical Treatment ◽  
Cold Work ◽  
Hadfield Steel ◽  
Outer Side ◽  
Viii And Ix ◽  
Machine Elements ◽  
The Impact

The relevance of the search for solutions to increase the wear resistance of bucket teeth of excavating machine type front shovel is analyzed. The reasons for the wear of the teeth are considered. It is determined that when excavating machines work for rocks of VIII and IX categories, impact-abrasive wear of the inner side of the teeth and abrasive external wear occurs. It is proved that the cold-work hardening of Hadfield steel (the teeth material), which occurs during the excavating machine teeth work in the rocks of VIII and IX categories, reduces the impact-abrasive wear rate on the inner side of the teeth and does not affect the abrasive wear of the outer. The methods for thermomechanical treatment of the outer side of the excavating machine tooth is proposed. It can increase the wear resistance of Hadfield steel (110G13L) up to 1.7 times and lead to the self-sharpening effect of the tooth due to equalization of the wear rate of the outer and inner parts of the tooth. The efficiency factor of thermomechanical treatment to reduce the of abrasive wear rate of Hadfield steel is experimentally proved.

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.

scholarly journals Effect of WC Grain Size and Abrasive Type on the Wear Performance of HVOF-Sprayed WC-20Cr3C2-7Ni Coatings

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 660
Author(s):  
Qun Wang ◽  
Yingpeng Zhang ◽  
Xiang Ding ◽  
Shaoyi Wang ◽  
Chidambaram Seshadri Ramachandran
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Test ◽  
Binder Phase ◽  
Repeated Impact ◽  
Wear Performance ◽  
The Matrix ◽  
Three Body

In order to investigate the effect of WC grain size on coatings’ properties and abrasive wear performance, a few WC-20Cr3C2-7Ni coatings with three different WC grain sizes were deposited by the high-velocity oxy-fuel (HVOF) thermal spray process. The phase compositions, microstructures, and mechanical properties of the coatings were investigated. Furthermore, the two- and three-body abrasive wear performances of the three coatings were tested by using SiC and SiO2 abrasives, respectively. The results show that all the three coatings were composed of WC, Cr3C2, and the Ni binder as well as the (W,Cr)2C phase. The abrasive wear resistance of the WC-20Cr3C2-7Ni coating monotonously increased with increasing WC grain size when the SiC abrasive was used in the two- and three-body abrasive wear tests. However, the wear resistance trend was reversed when the SiO2 abrasive was used in the three-body abrasive wear test. The specific wear rate of the WC-20Cr3C2-7Ni coating exposed to the SiC abrasive under the two-body abrasive wear test was the largest. The wear resistance of the coatings was more significantly affected by the hardness of the abrasive particles than the size of carbides present within the coating. The high hardness of SiC can cut both the carbide and the binder phase of the WC-based cermet coatings, resulting in a high wear rate, whereas the low hardness of SiO2 cuts and/or scratches the binder initially, and then it dislodges the carbides from the matrix. The dislodged carbides which were subsequently pulled out from the matrix by the repeated impact of the SiO2 abrasives result in a milder wear rate.

scholarly journals Microstructure and Properties of AA6061/SiCp Composites Sintered under Ultra High-Pressure

2020 ◽  
Vol 10 (20) ◽  
pp. 7363
Author(s):  
Lei Xu ◽  
Erkuo Yang ◽  
Yasong Wang ◽  
Changyun Li ◽  
Zhiru Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Wear Property ◽  
Ultra High Pressure ◽  
High Pressure Sintering

Ultra high-pressure sintering (UHPS) was used to prepare AA6061/SiCp composites with different contents and the effect of sintering temperatures on microstructure and mechanical properties was investigated in this study. The results showed that a uniform distribution of nano-SiC particles (N-SiCp) is obtained by the UHPS method. With the increase in N-SiCp contents, the higher hardness and better wear resistance could be inspected. The interfacial reactions and Al4C3 phase appeared above 550 °C. The relative density of composites first increased and then decreased; with the temperature raising it reached 99.58% at 600 °C. The hardness and wear property showed the same trend with the hardness reaching 52 HRA and wear rate being 1.0 × 10−6 g/m at 600 °C. Besides, the wear mechanism of the composites is mainly composed of abrasive wear and adhesive wear.

Two-Body Dry Abrasive Wear Performance of High Velocity Oxygen Fuel Spray Process and Electrodeposited Cermet Coatings

2017 ◽  
Vol 888 ◽  
pp. 131-135 ◽  
Author(s):  
Nur Amira Mohd Rabani ◽  
Zakiah Kamdi
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Wear Rate ◽  
Abrasive Wear ◽  
High Velocity ◽  
Wear Test ◽  
High Velocity Oxygen Fuel ◽  
Electrodeposited Coatings ◽  
Electrodeposited Nickel ◽  
Oxygen Fuel

In order to protect parts against wear, the carbon steel used are commonly coated by cermet coatings to increase the wear resistance. In this paper, the coatings consist of tungsten carbide 17wt% cobalt (WC-17Co), tungsten carbide 9wt% nickel (WC-9Ni), electrodeposited nickel (electro Ni) and electrodeposited nickel-silicon carbide (electro Ni-SiC) coatings. All coatings are deposited onto AISI 1018 carbon steel by using two different methods which are high velocity oxygen fuel (HVOF) and co-electrodeposition method. Abrasive wear test were observed under two‑body dry abrasion conditions with pin-on-disc test arrangement. Based on the volume loss after the wear test, the wear rates were calculated by using Archard’s law. The wear tracks of the coatings were investigated by using scanning electron microscope (SEM) and atomic force microscopy (AFM). The hardness of each coating was measured by using Vickers microhardness. The results showed that HVOF coatings have lower wear rate compared to the electrodeposited coatings. WC-9Ni has the lowest wear rate which is 4.06×10-3 mm3/Nm much lower compared to electro Ni-SiC of 16.36×10-3 mm3/Nm. This result was expected as the hardness of WC-9Ni is 1625.37 HV higher than electrodeposited coatings which approximately 380.51 HV. In conclusion, the methods of coating deposited affect the wear resistance as well as the hardness of the coatings.

Tribological Properties of Ti3SnC2/Cu Composite

2014 ◽  
Vol 602-603 ◽  
pp. 519-522 ◽  
Author(s):  
Zai Ji Zhan ◽  
Dan Dan Zhang ◽  
Chang Hong Guo ◽  
Wei Chai
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Tribological Properties ◽  
Applied Load ◽  
Tribological Behavior ◽  
Oxidative Wear ◽  
The Matrix ◽  
Steel Balls

In this study, 5 wt. % Ti3SnC2/Cu composite was synthesized by hot pressed sintering, and its tribological properties against AISI52100 steel balls were investigated using a ball-on-disk wear tester. The effects of sliding speeds and applied loads on the tribological behavior of Ti3SnC2/Cu were studied. The results showed the wear rate of Ti3SnC2/Cu composite increased with the increase of applied load and decreased with increase of sliding speed. The main tribological mechanisms of Ti3SnC2/Cu were abrasive wear and slightly oxidative wear. The friction coefficient of Ti3SnC2/Cu composite was stable and much lower than that of Cu at the same conditions. The loads were effectively born by the Ti3SnC2particles and the wear resistance of the matrix was obviously improved.

Three-Body Abrasive Wear Behavior of Basalt and Glass Fabric Reinforced Epoxy Composites

2011 ◽  
Vol 121-126 ◽  
pp. 534-538 ◽  
Author(s):  
C. Anand Chairman ◽  
S.P. Kumaresh Babu
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Basalt Fiber ◽  
Specific Wear Rate ◽  
Abrasive Wear Behavior ◽  
Three Body ◽  
Increasing Load

Three-body abrasive wear behavior of basalt–epoxy (B–E) and glass–epoxy (G–E) composites have been investigated using Dry sand rubber wheel abrasion resistance for various abrading distance, viz., 150, 300, 450 and 600m and different loads(22N and 32N) at 200 rpm. The weight loss and specific wear rate as a function of load and abrading distance were determined. The weight loss increases with increasing load and also with abrading distance while the specific wear rate decreases with increase in abrading distance and increases with the load. Better abrasion wear resistance was observed in B-E composite compared to G–E composite. Scanning Electron Microscope (SEM) is used to examine the abraded composite specimens and revealed that the more damage occur to glass fiber compared to basalt fiber. Also good interfacial adhesion was observed between epoxy and basalt fiber which leads to good abrasive wear resistance.

Nonlinear Wear Response of WC-Ni Cemented Carbides Irradiated by High-Intensity Pulsed Ion Beam

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
X. P. Zhu ◽  
F. G. Zhang ◽  
T. K. Song ◽  
M. K. Lei
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
High Intensity ◽  
Ion Beam ◽  
Surface Hardness ◽  
Specific Wear Rate ◽  
Cemented Carbides ◽  
Grain Fragmentation ◽  
Wear Response

Surface hardening on WC-Ni cemented carbides was achieved by high-intensity pulsed ion beam (HIPIB) irradiation, with formation of a binderless, densified, and “hilly” remelted top layer of a few μm in depth and a shock strengthened underlayer down to a hundred μm. The tribological behavior of the samples was studied under dry sliding against GCr15 bearing steel on a block-on-ring tribometer with 98 N and 0.47 m/s. The specific wear rate/wear resistance presented an exponential dependence on the surface hardness, in contrast to the commonly reported linear dependence of the specific wear rate or wear resistance on the hardness of WC based cemented carbides among both WC-Ni and WC-Co systems. The original samples underwent a severe abrasive wear due to the Ni binder micro-abrasion and WC grain fragmentation/pullout, whereas the irradiated samples began with a gradual abrasion of the binderless hard tops, followed by a mild abrasive wear accompanied by local adhesive wear. The wear resistance has been also compared with the reported data concerning the relative hardness of friction pairs in a value range of 2–7 on block-on-ring tribometer tests with the friction pairs of WC cemented carbides and steels in unlubricated condition. The nonlinear wear response is explained by the wear mechanism transition otherwise unobtainable in the case of the reported hardening by either lowering the binder content or refining the WC grains. It is revealed that the interfacial bonding enhancement of the WC/binder and the binder strengthening are pronounced for improving the wear resistance of the cemented carbides, by the effective suppressing of the WC grain fragmentation/pullout and binder micro-abrasion, even though they have limited contribution to the hardness enhancement.

Abrasive wear of polymer/steel gear drives

2008 ◽  
Vol 4 (1) ◽  
pp. 1-26
Author(s):  
Gábor Kalácska
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Material Selection ◽  
Solid Particles ◽  
Soil Types ◽  
General View ◽  
Modern Engineering ◽  
Clean Environment ◽  
Engineering Polymers ◽  
Plastic Gears

Research was performed on the friction, wear and efficiency of plastic gears made of modern engineering polymers and their composites both in a clean environment (adhesive sliding surfaces) and in an environment contaminated with solid particles and dust (abrasive), with no lubrication at all. The purpose is to give a general view about the results of abrasive wear tests including seven soil types as abrasive media. At the first stage of the research silicious sand was applied between the meshing gears and the wear of plastic and steel gears was evaluated and analyzed from the point of different material properties (elongation at break, hardness, yield stress, modulus of elasticity) and its combinations. The different correlations between the experienced wear and material features are also introduced. At the second stage of the project the abrasive sand was replaced with different physical soil types. The abrasive wear of gears is plotted in the function of soil types. The results highlight on the considerable role of physical soil types on abrasive wear resistance and the conclusions contain the detailed wear resistance. The results offer a new tribology database for the operation and maintenance of agricultural machines with the opportunity of a better material selection according to the dominant soil type. This can finally result longer lifetime and higher reliability of wearing plastic/steel parts.

BÖHLER K100

Alloy Digest ◽  
2020 ◽  
Vol 69 (3) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Abrasive Wear ◽  
Tool Steel ◽  
Cold Work ◽  
Abrasive Wear Resistance ◽  
High Carbon ◽  
High Chromium ◽  
Cold Work Tool Steel

Abstract Böhler K100 is a high-carbon, high-chromium (12%), alloy cold-work tool steel that is suitable for medium run tooling in applications where a very good abrasive wear resistance is needed but where demands on chipping resistance are small. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming and machining. Filing Code: TS-788. Producer or source: voestalpine Böhler Edelstahl GmbH & Co.

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