An Effect of Fillers on the Structure and Abrasive Wear of Polyurethane Urea

2021 ◽  
Vol 1031 ◽  
pp. 80-87
Author(s):  
Valeriy Senichev ◽  
Eduard Pogorel’tsev ◽  
Aleksey Slobodinyuk ◽  
Dmitriy Kiselkov ◽  
Marina Makarova
Keyword(s):  
Molecular Weight ◽  
Abrasive Wear ◽  
Molybdenum Disulfide ◽  
Concentration Dependence ◽  
Polymer Material ◽  
Wear Mechanism ◽  
Filler Content ◽  
Calcium Stearate ◽  
Frictional Properties ◽  
Extreme Character

The introduction of small amounts of calcium stearate and molybdenum disulfide into polyurethane ureas based on a oligoether of polyoxytetramethylenediol with a molecular weight M~1000 does not lead to a significant change in the abrasive wear mechanism of the polymer material. The concentration dependence of the wear degree on the filler content has an extreme character, which is associated with the different direction of the filler effect on the cohesive and frictional properties of the studied material.

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

Effect of CeO2 addition on microstructure and tribological characteristics of laser cladded Cu10Al–MoS2 coating under oil lubrication

2021 ◽  
pp. 146442072110309
Author(s):  
Shao Lifan ◽  
Ge Yuan ◽  
Kong Dejun
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Mass Fraction ◽  
Friction Reduction ◽  
Depth Of Field ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Fatigue Wear ◽  
Wear Rates ◽  
Mass Fractions

In order to improve the friction and wear properties of Cu10Al–MoS2 coating, the addition of CeO2 is one of the present research hot spots. In this work, Cu10Al–MoS2 coatings with different CeO2 mass fractions were successfully fabricated on Q235 steel using a laser cladding. The microstructure and phase compositions of obtained coatings were analyzed using an ultra-depth of field microscope and X-ray diffraction, respectively. The friction-wear test was carried out under oil lubrication using a ball-on-disk wear tester, and the effects of CeO2 mass fraction on the microstructure, hardness, and friction-wear properties were studied, and the wear mechanism was also discussed. The results show that the laser cladded Cu10Al–MoS2 coatings with the different CeO2 mass fractions were mainly composed of Cu9Al4, Cu, AlFe3, Ni, MoS2, and CeO2 phases. The Vickers-hardness (HV) of Cu10Al–8MoS2–3CeO2, Cu10Al–8MoS2–6CeO2, and Cu10Al–8MoS2–9CeO2 coatings was 418, 445, and 457 HV0.3, respectively, which indicates an increase in hardness with the increase of CeO2 mass fraction. The average coefficients of friction (COF) and wear rates decrease with the increase of CeO2 mass fraction, presenting the outstanding friction reduction and wear resistance performances. The wear mechanism of Cu10Al–MoS2 coatings is changed from abrasive wear with slight fatigue wear to abrasive wear with the increase of CeO2 mass fraction.

Elastomeric Properties of Butyl Rubber

1959 ◽  
Vol 32 (5) ◽  
pp. 1475-1586 ◽  
Author(s):  
D. J. Buckley
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polymer Material ◽  
Basic Knowledge ◽  
Ample Evidence ◽  
Order And Disorder ◽  
Technological Information ◽  
New Material ◽  
Fruitful Research ◽  
Made In

Abstract On first thought, the properties controlling the behavior of high molecular weight substances would appear to be so overwhelmingly numerous as to defy consolidation and simplification. However, upon analysis, it can be seen clearly that they all reduce to areas of consideration which make up a relatively small group. For elastomers, such a grouping might be as follows. Size Shape Order and Disorder Composition Crosslinked Network Response to Deformation Degradative Reactions This reviewer does not intend to imply that each area can be considered mutually exclusive of any of the others. There is ample evidence of considerable interaction between these areas. Moreover, it is not intended to imply that the approach to elastomeric problems is utterly simple. The complexity within any one of the areas mentioned is well known from the literature on polymers. However, it is suggested that a grouping or classification such as given here can assure a greater clarity of concept and objectivity of analysis and experiment in approaching otherwise obtuse and complicated polymer problems. As each new polymer material comes under research scrutiny in this sense, the general “laws” governing polymer behavior are clarified and extended. This is a result of the fact that each new material usually provides features which invite and encourage research, particularly where uncertainty exists. The ease of butyl type polymers will be reviewed in this sense with two purposes in mind: (1) to define and correlate the knowledge derived from butyl research which has contributed to a better understanding of the principles of polymers, and (2) to suggest (often by inference) areas where potentially fruitful research in the same direction is still possible. This review will consider butyl polymers beyond the polymerization stage. Except where necessary to develop the proposed objectives, the chemistry of polymerization will not be considered. A number of references are recommended to the reader interested in the polymerization aspects. No attempt will be made in this review to consider butyl end uses or the compounding and technological information associated therewith. Some exception to this restriction will be made when the particular property under consideration warrants it. Rather, this review will attempt to show how a development of the basic knowledge of polymer behavior can be put to use in the solution of technological problems.

Study of Abrasive Wear Mechanism through Nano Machining

2011 ◽  
Vol 462-463 ◽  
pp. 931-936 ◽  
Author(s):  
Sumaiya Islam ◽  
Raafat N. Ibrahim ◽  
Raj Das
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Bulk Material ◽  
Elastic Recovery ◽  
In Situ Observation ◽  
Nano Scale ◽  
Nickel Coatings ◽  
Machining Operations ◽  
Tip Radius

The objective of this paper is to understand the abrasive wear mechanism for producing a nano scale groove on a bulk material through nano machining. A nano indenter equipped with a nano scratching attachment was used for nano machining operation and in situ observation of the machined surfaces. Two different tools (Berkovich and Conical) with the same tip radius (100nm) but different edge geometries were used to machine both Copper and Nickel coatings. It was found that the percentage of elastic recovery was lower for Cu than Ni during this nano machining operations. Hence, the deformation mechanism in nano machining operation was identified as elasto-plastic in nature as opposed to the well established completely plastic mode of conventional machining operations. The pile up volume due to plastic deformation was utilized to distinguish between the ploughing and cutting modes of abrasive wear mechanisms. The results reveal that the ploughing mechanism was dominant for Cu and the cutting mechanism was dominant for Ni machining. Moreover, both mechanisms ploughing and cutting were the dominant modes of abrasive wear using the Berkovich tip compared to the Conical tip for producing a nano scale groove through nano machining.

Effect of polymer molecular weight and addition of calcium stearate on response of MG63 osteoblast-like cells to UHMWPE particles

2001 ◽  
Vol 19 (2) ◽  
pp. 179-186 ◽  
Author(s):  
D. D. Dean ◽  
C. H. Lohmann ◽  
V. L. Sylvia ◽  
G. Köster ◽  
Y. Liu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Calcium Stearate ◽  
Polymer Molecular Weight

Influence of Neodymium on Wear Resistance of Hypereutectic Al-Si Alloy

2015 ◽  
Vol 1095 ◽  
pp. 135-139
Author(s):  
Wei Xi Shi ◽  
Cheng Wu Du ◽  
Gui Mao Li ◽  
Zhi Ming Liu
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Primary Silicon ◽  
Oxidative Wear ◽  
Initial Sample ◽  
Unmodified Alloy ◽  
Resistance Tests

The morphology of eutectic and primary silicon phases was analyzed by OM and SEM. OM and SEM results show that pure Nd can significantly refine both eutectic and primary silicon of hypereutectic Al-20%Si alloy. Morphology of primary silicon is transformed from star-shaped and irregular morphology to fine polyhedral and grain size of primary silicon is refined from 80~120 μm to 20~50 μm. Friction and wear resistance tests show that friction coefficient of Al-20%Si alloy reduces after Nd modification. Wear resistance of Al-20%Si alloy after modification is significantly improved as compared to the initial sample. The dominant wear mechanism for 0.3% Nd modified alloy is abrasive wear, adhesive wear and oxidative wear mechanism, but wear mechanism for unmodified alloy is abrasive wear and adhesive wear mechanism.

scholarly journals The Effect of Adding Calcium Stearate on Wear-resistance of Ultra-high Molecular Weight Polyethylene

2015 ◽  
Vol 113 ◽  
pp. 490-498 ◽  
Author(s):  
С.V. Panin ◽  
L.A. Kornienko ◽  
T. Nguyen Suan ◽  
L.R. Ivanova ◽  
M.A. Poltaranin
Keyword(s):  
Molecular Weight ◽  
Wear Resistance ◽  
High Molecular Weight ◽  
Calcium Stearate ◽  
Ultra High Molecular Weight
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