Evolution of contact surface characteristics and tribological properties of a copper-based sintered material during high-energy braking

Wear ◽  
2021 ◽  
pp. 204163
Author(s):  
Yelong Xiao ◽  
Yu Cheng ◽  
Haibin Zhou ◽  
Weihan Liang ◽  
Mingxue Shen ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Contact Surface ◽  
Sintered Material ◽  
Surface Characteristics ◽  
High Energy

scholarly journals The Use of Lasers in Dental Materials: A Review

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3370
Author(s):  
Emmanouil-George C. Tzanakakis ◽  
Evangelos Skoulas ◽  
Eudoxie Pepelassi ◽  
Petros Koidis ◽  
Ioannis G. Tzoutzas
Keyword(s):  
Energy Levels ◽  
Dental Materials ◽  
High Strength ◽  
Surface Characteristics ◽  
High Energy ◽  
Zirconia Ceramics ◽  
Material Management ◽  
Laboratory Procedures ◽  
Laser Devices ◽  
Exact Point

Lasers have been well integrated in clinical dentistry for the last two decades, providing clinical alternatives in the management of both soft and hard tissues with an expanding use in the field of dental materials. One of their main advantages is that they can deliver very low to very high concentrated power at an exact point on any substrate by all possible means. The aim of this review is to thoroughly analyze the use of lasers in the processing of dental materials and to enlighten the new trends in laser technology focused on dental material management. New approaches for the elaboration of dental materials that require high energy levels and delicate processing, such as metals, ceramics, and resins are provided, while time consuming laboratory procedures, such as cutting restorative materials, welding, and sintering are facilitated. In addition, surface characteristics of titanium alloys and high strength ceramics can be altered. Finally, the potential of lasers to increase the adhesion of zirconia ceramics to different substrates has been tested for all laser devices, including a new ultrafast generation of lasers.

Tribological Properties of Composite Materials Based on Titanium Prepared by High-Energy Action Methods

Metallurgist ◽  
2015 ◽  
Vol 59 (7-8) ◽  
pp. 640-644
Author(s):  
A. O. Krivenkov ◽  
S. N. Chugunov ◽  
D. B. Kryukov ◽  
A. N. Baranov ◽  
M. S. Gus’kov
Keyword(s):  
Composite Materials ◽  
Tribological Properties ◽  
High Energy ◽  
Action Methods

Evaluation of Tribological Properties of Organoclay Reinforced UHMWPE Nanocomposites

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Abdul Samad Mohammed ◽  
Annas bin Ali ◽  
Merah Nesar
Keyword(s):  
Tribological Properties ◽  
Large Scale ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
High Energy ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Uniform Dispersion ◽  
Ultrahigh Molecular Weight ◽  
Energy Ball

The current study is aimed to investigate the tribological properties of ultrahigh molecular weight polyethylene (UHMWPE) reinforced with organoclay Cloisite (C15A). Nanocomposites are prepared using a high energy ball milling process followed by hot pressing. Three different loadings of 0.5 wt.%, 1.5 wt.%, and 3 wt.% of C15A, respectively, are used as reinforcement. Results from the ball-on-disk wear tests showed that nanocomposites reinforced with 1.5 wt.% of C15A exhibited best wear resistance and lower coefficient of friction (COF), with C15A reducing the wear rate by 41% and the COF by 38%, when compared to the pristine UHMWPE. These improvements are attributed to the uniform dispersion of the nanosized clay platelets preventing large-scale material removal and formation of a thin tenacious, continuous transfer film on the counterface for C15A organoclay composites. X-ray diffraction (XRD), scanning electron microscopy (SEM), and optical profilometry are used to characterize the morphology of the nanocomposites and the wear tracks. SEM images of worn surfaces indicated more abrasive wear for the case of pristine UHMWPE as compared to organoclay composites.

scholarly journals Membrane Distillation for Wastewater Treatment: A Mini Review

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3480
Author(s):  
Zhongsen Yan ◽  
Yuling Jiang ◽  
Lingshan Liu ◽  
Zhongsheng Li ◽  
Xiaolei Chen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Waste Heat ◽  
Human Life ◽  
Textile Wastewater ◽  
Surface Characteristics ◽  
High Energy ◽  
Membrane Distillation ◽  
Water Treatment Process ◽  
Radioactive Wastewater

Water serves as an indispensable part of human life and production. On account of the overexploitation of traditional water sources, the demand for wastewater recycling is expanding rapidly. As a promising water treatment process, membrane distillation (MD) has been utilized in various wastewater treatments, such as desalination brine, textile wastewater, radioactive wastewater, and oily wastewater. This review summarized the investigation work applying MD in wastewater treatment, and the performance was comprehensively introduced. Moreover, the obstructions of industrialization, such as membrane fouling, membrane wetting, and high energy consumption, were discussed with the practical investigation. To cope with these problems, various strategies have been adopted to enhance MD performance, including coupling membrane processes and developing membranes with specific surface characteristics. In addition, the significance of nutrient recovery and waste heat utilization was indicated.

The influence of carbon additions on structure and properties of composites manufactured via powder metallurgy method

2015 ◽  
Vol 2015 (CICMT) ◽  
pp. 000125-000130
Author(s):  
Bartosz Hekner ◽  
Jerzy Myalski
Keyword(s):  
Carbon Nanotubes ◽  
Silicon Nitride ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Glassy Carbon ◽  
High Energy ◽  
Powder Metallurgy Method ◽  
Composite Powders ◽  
Carbon Particles ◽  
Carbon Additions

This paper presents an influence of reinforcement and additions types on tribological properties for composite materials produced for potential application in high loaded friction point. The influence of carbon nanotubes or amorphous form of carbon on tribological properties was subject of authors' interest. A technology of materials manufacturing based on preparation of composite powders using high energy ball milling, with subsequent hot pressing in the semi-liquid phase. All materials based on an aluminum alloys, with silicon carbide (SiC) or silicon nitride particles (Si3N4) applied as a reinforcement. As a additions 1 wt.% of multiwalled carbon nanotubes (CNT) or 5 wt.% of glassy carbon particles (GCp) were used. A proper parameters selection (speed, powder to ball ratio, time ect.) of high energy milling led to fragmentation of ceramic particles up to nano- or submicro scale with desirable homogenization in whole volume of solid material. Due to partially crushed of glassy carbon particles, their size was between 2 – 200 μm. However GCp revealed also proper distribution in volume of composite. Moreover, the good quality of bonding between matrix and reinforcement particles were achieved due to high energy during milling. For manufactured materials a rating of tribological properties (coefficient of friction, wear rate, ect.) at ambient and high temperature were made. The research confirmed that, due to desirable coefficient of friction (COF) value and low mass loss, manufactured materials can be applied in automotive industry, eg. for brake pads. A high stability of COF on desirable value (0.5 – 0.8) was observed up to temperature higher than 500 °C. The application of carbon additions resulted in increasing of friction properties. The material with silicon nitride as a reinforcement and glassy carbon particles addition revealed the best friction properties between analysed materials.

A Study of Surface Characteristics of Flank Lock Type Precision Locknut Under a Vertical Installation

2016 ◽  
Vol 34 (1) ◽  
pp. 47-58 ◽  
Author(s):  
C.-M. Chen ◽  
C.-H. Sun
Keyword(s):  
Surface Roughness ◽  
Contact Surface ◽  
Surface Characteristics ◽  
Thread Surface ◽  
Surface Flatness ◽  
Before And After ◽  
Set Up

AbstractThe study attempted to observe the surface characteristics of the flank lock type precision locknut which was assembled in a vertical type and operates under different tightening speed. The speed setting was in according with the specifications of 4rpm, 6rpm and 8rpm conditions to set up this experiment. A type of 2TML lubricant was used. The experiment investigated the surface characteristics of a locknut, including contact surface flatness, contact surface roughness, and thread surface roughness before and after the designed test. According to the contact surface flatness of the locknut obtained from this study, it was found that the surface of the locknut contacting with the bearing resulted into a deterioration of the surface flatness and surface roughness during the tests. Furthermore, the thread surface roughness has been changed at different thread for different tightening speed during the test, especially at threads 1, 2, 7 and 8. The study found that some of variations occurred in the values of Ra, Rz and Rmax at different thread of a locknut. The variation of Rmax is the most among them.

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