Tribological modification of high-density polyethylene by using carbon soot from diesel combustion

2016 ◽  
Vol 68 (5) ◽  
pp. 603-610 ◽  
Author(s):  
X.A. Cao ◽  
G.Q. Shao ◽  
K.H. Hu
Keyword(s):  
Abrasive Wear ◽  
Amorphous Carbon ◽  
Tribological Properties ◽  
High Density Polyethylene ◽  
Friction Pair ◽  
High Density ◽  
Exhaust Emission ◽  
Content Type ◽  
Transmission Electron ◽  
Carbon Soot

Purpose The purpose of this paper is to explore the tribological properties of high-density polyethylene (HDPE) modified by carbon soot from the combustion of No. 0 diesel. Design/methodology/approach Carbon soot is characterized using X-ray diffraction, transmission electron microscopy and scanning electronic microscopy. The tribological properties of HDPE samples with carbon soot are investigated on a materials surface tester with a ball-on-disk friction pair. Findings The collected carbon soot mainly comprises amorphous carbon nanoparticles of 50-100 nm in diameter. The main wear behaviours of pure HDPE include abrasive wear and plastic deformation. After adding carbon soot nanoparticles to HDPE, HDPE wear decreases. The appropriate carbon soot content is 8 per cent in HDPE under the selected testing conditions. Compared with other HDPE samples, HDPE with 8 per cent carbon soot has higher melting temperature, lower abrasive wear and better wear resistance. The lubrication of HDPE with carbon soot is due to the formation of a transferring film composed of HDPE, amorphous carbon and graphite carbon. Originality/value The paper reveals the HDPE modification and lubrication mechanisms by using carbon soot from the combustion of diesel. Related research can perhaps provide a potential approach for the treatment of carbon soot exhaust emission.

Shear strength and temperature distribution model of friction spot lap joint of high density polyethylene with aluminum alloy 7075

2019 ◽  
Vol 10 (4) ◽  
pp. 469-483 ◽  
Author(s):  
Isam Tareq Abdullah ◽  
Sabah Khammass Hussein
Keyword(s):  
Shear Strength ◽  
Temperature Distribution ◽  
High Density Polyethylene ◽  
Contact Region ◽  
High Density ◽  
Distribution Model ◽  
Lap Joint ◽  
Content Type ◽  
Rotating Speed ◽  
Model Of Friction

Purpose The purpose of this paper is to join a sheet of the AA7075 with the high-density polyethylene (HDPE) by a lap joint using friction spot processing and investigate the temperature distribution of joint during this process using the finite element method (FEM). Design/methodology/approach A semi-conical hole was manufactured in the AA7075 specimen and a lap joint configuration was prepared with the HDPE specimen. A rotating tool was used to generate the required heat to melt the polymer by the friction with the AA7075 specimen. The applied tool force moved the molten polymer through the hole. Four parameters were used: lower diameter of hole, rotating speed, plunging depth and time. The results of shear test were analyzed using the Taguchi method. A FEM was presented to estimate the temperature distribution of joint during the process. Findings All specimens failed by shearing the polymer at the lap joint region without dislocation. The specimens of the smallest diameter exhibited the highest shear strength at the lap joint. The maximum ranges of temperature were recorded at the contact region between the rotating tool and the AA7075 specimen. The tool plunging depth recorded the highest effect on the generated heat compared with the rotating speed and plunging time. Originality/value For the first time, the AA7075 sheet was joined with the HDPE sheet by friction spot processing. The temperature distribution of this joint was simulated using the FEM.

Experimental study on the influence of friction pair material hardness on the tribological behaviors of water lubricated thrust bearings

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xingxin Liang ◽  
Zhiyong Yang
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Friction Pair ◽  
Aluminum Bronze ◽  
Heavy Load ◽  
Content Type ◽  
Thrust Bearings ◽  
Tribological Behaviors ◽  
Polymer Bearing

Purpose This paper aims to confirm that increasing the hardness of thrust collars can improve the load carrying capacity (LCC) and wear resistance of water lubricated thrust bearings (WTBs) made of polymers paired with non-polymeric thrust collars, and to design a WTB with high LCC and durability for a shaftless pump-jet propulsor of an autonomous underwater vehicle. Six kinds of WTBs were manufactured by matching aluminum bronze, stainless steel and silicon nitride with two different polymer bearing materials. Their tribological behaviors were tested and compared. Design/methodology/approach The tribological behaviors of the WTBs made with different materials were investigated experimentally on a specially designed test rig. Findings Aluminum bronze is not suitable for crafting thrust collars of heavy load WTBs due to severe abrasive wear. Two body abrasive wear first occurred between the thrust collar and the polymer bearing. Next, aluminum bronze wear particles were produced. The particles acted between the two materials and formed three body abrasive wear. Stainless steel/polymer bearings showed better wear resistance while Si3N4/polymer bearings were the best. Improving the hardness of thrust collars is significant to the LCC and service life of WTBs. Originality/value The wear mechanism of WTBs under heavy load conditions was revealed. Improving the hardness of the thrust collar was confirmed to be a preferable method to improve the wear resistance and LCC of WTBs. The results of this study may provide an important reference for the selection of water lubricated materials and the design of heavy load WTBs.

Synthesis and tribological properties of nanogrease

2018 ◽  
Vol 70 (3) ◽  
pp. 512-518 ◽  
Author(s):  
Alaa Mohamed ◽  
Mohamed Hamdy ◽  
Mohamed Bayoumi ◽  
Tarek Osman
Keyword(s):  
Electron Microscopy ◽  
Tribological Properties ◽  
Power Efficiency ◽  
New Technologies ◽  
Mechanical Equipment ◽  
Content Type ◽  
Base Oil ◽  
X Ray ◽  
Transmission Electron ◽  
Steel Balls

Purpose To enhance the tribological properties of nanogrease, one of the new technologies was used to synthesize a nanogrease having carbon nanotubes (CNTs) nanoparticles (NPs) with different concentrations. The microstructures of the synthesized NPs were characterized and evaluated by x-ray diffraction spectroscopy (XRD) and transmission electron microscopy (TEM). Tribological properties of the nanogrease were evaluated using a four-ball tester. The worn surface of four steel balls was investigated by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX). Design/methodology/approach Grease was dissolved in chloroform (10 Wt.%), at 25 °C for 1 h. In parallel, functionalized CNTs with different volume concentrations (0.5, 1, 2 and 3 Wt.%) were dispersed in N, N-dimethylformamide. The mixture was stirred for 15 min and then sonicated (40 kHz, 150 W) for 30 min. After that, the mixture was added to the grease solution and magnetically stirred for 15 min and then sonicated for 2 h. Findings The results suggested that CNTs can enhance the antiwear and friction properties of nanogrease at 0.5 Wt.% CNTs to about 57 and 48 per cent, respectively. In addition, the weld load of the base oil containing 0.5 Wt.% CNTs was improved by 17 per cent compared with base grease. Originality/value This work describes the inexpensive and simple fabrication of nanogrease for improving the properties of lubricants, which improve power efficiency and extend lifetimes of mechanical equipment.

Effect of MWCNTs/Talc powder nanoparticles on the tribological and thermal conductivity performance of calcium grease

2019 ◽  
Vol 72 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Ahmed Mobasher ◽  
Alaa Khalil ◽  
Medhat Khashaba ◽  
Tarek Osman
Keyword(s):  
Thermal Conductivity ◽  
Tribological Properties ◽  
Power Efficiency ◽  
Friction Reduction ◽  
Wear Testing ◽  
Mechanical Equipment ◽  
Content Type ◽  
Transmission Electron ◽  
Nano Additives ◽  
Pin On Disk

Purpose The purpose of this paper is to evaluate the influence of nanoparticles as an additive on the tribological properties of calcium grease. Design/methodology/approach The nano additives in this research are with different concentration of multi carbon nanotubes (MWCNTs) and Talc powder (1, 2, 3, 3 and 5 per cent). The ratio of MWCNTs to Talc powder is 1:1. The tribological properties of hyper MWCNTs/Talc powder to calcium grease were evaluated using a pin-on-disk wear testing. The results show that the nano additives MWCNTs/Talc to calcium grease exhibit good performance in anti-wear and friction reduction. The action mechanism was estimated through analysis of the worm surface with x-ray diffraction and transmission electron microscope. Findings The result indicates that boundary film mainly composed of MWCNT and Talc powder, and other organic compound was formed on the worm surface during the friction test. In addition, the wear rate and coefficient of friction of nanogreases have shown excellent improvement about 80.62 and 63.44 per cent, respectively, at 4 Wt.% of MWCNTs/Talc powder. Moreover, the thermal conductivity of nanogrease increased about 51.72 per cent. Originality/value This study describes the inexpensive and simple fabrication of nanogrease for improving properties of lubricants, which improve power efficiency and extend lifetimes of mechanical equipment.

Relation between Microstructure and Tribological Properties of High Density Polyethylene Hybrid Composites Filled with Untreated Glass Spheres, Talc and Calcium Carbonate

2013 ◽  
Vol 592-593 ◽  
pp. 655-659
Author(s):  
Münir Taşdemir
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
High Density Polyethylene ◽  
Elasticity Modulus ◽  
Filler Content ◽  
Hybrid Composites ◽  
High Density ◽  
Structure And Properties ◽  
Glass Spheres ◽  
High Level

In the present work, high density polyethylene based composites filled with glass spheres, talc and calcite particles were prepared. Fillers contents in the HDPE were 5, 10, 15, and 20 wt%. The mechanical, morphological and tribological properties of the polymer composites were investigated. Substantial improvements in the some mechanical properties were obtained by the addition of filler. For example, the results showed that the elasticity modulus of composites improved with increasing the filler content. The addition of fillers to the HDPE changed significantly the friction coefficient and wear rate of the composites. HDPE filled with a high level content of fillers showed higher wear rate than pure HDPE under dry sliding. The structure and properties of the composites are characterized using a scanning electron microscopy (SEM).

Tribological Properties of MoS2 with Different Morphologies in High-Density Polyethylene

2012 ◽  
Vol 47 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Kun Hong Hu ◽  
Xian Guo Hu ◽  
Jin Wang ◽  
Yu Fu Xu ◽  
Cheng Liang Han
Keyword(s):  
Tribological Properties ◽  
High Density Polyethylene ◽  
High Density

scholarly journals High-Density Polyethylene Composites Filled with Nanosilica Containing Immobilized Nanosilver or Nanocopper: Thermal, Mechanical, and Bactericidal Properties and Morphology and Interphase Characterization

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Regina Jeziórska ◽  
Maria Zielecka ◽  
Beata Gutarowska ◽  
Zofia Żakowska
Keyword(s):  
High Density Polyethylene ◽  
Interfacial Adhesion ◽  
Crystallization Behavior ◽  
High Density ◽  
Melt Blending ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Bactericidal Properties ◽  
Excellent Activity ◽  
Thermal Stability Of

Silica containing immobilized nanosilver (Ag-SiO2) or nanocopper (Cu-SiO2) was used as a filler for high-density polyethylene (HDPE). The HDPE/Ag-SiO2and HDPE/Cu-SiO2composites were prepared by melt blending and injection molding. The microstructure of the composites was examined using transmission electron microscopy (TEM). The crystallization behavior and thermal properties were studied using differential scanning calorimetry (DSC) and thermogravimetry (TGA). The mechanical properties were characterized by tensile, flexural, and impact tests as well as dynamic mechanical thermal analysis (DMTA). The ability of silica to give antimicrobial activity to HDPE was also investigated and discussed. The TEM images indicate that Ag-SiO2show lower degree of agglomeration than Cu-SiO2nanoparticles. The crystallization temperature increased, whereas crystallinity decreased in the composites. The thermal stability of the composites was significantly better compared to HDPE. Improved stiffness indicating very good interfacial adhesion was observed. Excellent activity against different kinds of bacteria was found.

Effect of the bionic morphologies on bio-tribological properties of surface-modified layers on Ti6Al4V with Ni+/N+ implantation

2018 ◽  
Vol 70 (2) ◽  
pp. 325-330 ◽  
Author(s):  
Yuan Wang
Keyword(s):  
Tribological Properties ◽  
Design Methodology ◽  
Friction Pair ◽  
Artificial Saliva ◽  
Ti6al4v Alloy ◽  
Implantation Technique ◽  
Content Type ◽  
X Ray ◽  
Tribological Tests ◽  
Surface Modified

Purpose The main purpose of this study is to enhance bio-tribological properties of Ti6Al4V and the surface-modified layers of Ni+/N+-implanted Ti6Al4V alloy, bionic texturing was done on Ti6Al4V surface. Design/methodology/approach The phase compositions and nano-hardness of the surface-modified layers of the samples have been analyzed by X-ray diffractometer and Nano Indenter, respectively. This paper has conducted bio-tribological tests under artificial saliva, sodium hyalurate and sodium hyalurate +γ-globulin by micro tribology multifunction tribometer, with ZrO2 ball/modified layer as the friction pair. S-3000N scanning electron microscope has been used to analyze the morphology of the surface-modified layers and scratches of the ones after the bio-tribological tests. Findings The results show that the surface-modified layers were mainly composed of Ti2Ni and Ti2N. Moreover, bionic texturing can obviously increase the contents of Ti2Ni and Ti2N that were formed on the surface of Ni+/N+-implanted Ti6Al4V alloy, and enhance the nano-hardness of the surface-modified layers. It could also reduce the friction coefficients of the surface-modified layers, and render the modified layers more wear-resistant. Originality/value The surface bio-tribological properties of Ti6Al4V have been enhanced by ion implantation technique and bionic texturing in this paper; this provided a new method for the research of related fields.

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