A Review of Surface Texture of Tribological Interfaces

2010 ◽  
Vol 37-38 ◽  
pp. 41-45 ◽  
Author(s):  
Zhi Wei Wang ◽  
Mei Wei Chen ◽  
Jian Wei Wu ◽  
Hai Hui Zheng ◽  
Xiao Feng Zheng
Keyword(s):  
Modeling And Simulation ◽  
Surface Texture ◽  
Review Paper ◽  
Tribological Performance ◽  
Current Status ◽  
Comprehensive View ◽  
Lubrication Performance ◽  
Mechanical Components ◽  
Friction And Lubrication

Surface texture of tribological interfaces has the potential to improve friction and lubrication performance of various mechanical components. This review paper emphasizes on the current status of the research of surface texture, including the features, the effects on tribological performance, the forming techniques, and the modeling and simulation of surface texture. It is intended to help readers to gain a more comprehensive view on surface texture of tribological interfaces.

Forestry Research in Mine Reclamation in India: Past, Present and Future

2021 ◽  
Vol 43 (1) ◽  
pp. 10-18
Author(s):  
Sanjay Singh ◽  
Keyword(s):  
Economic Growth ◽  
Soil Erosion ◽  
United Nations ◽  
Ground Water ◽  
Natural Environment ◽  
Review Paper ◽  
Ecosystem Restoration ◽  
Mine Reclamation ◽  
Current Status ◽  
Forestry Research

Minerals greatly influence the economic growth of any country. However, extensive mining can adversely affect the natural environment in the form of loss of biodiversity, soil erosion, contamination of surface and ground water. Therefore, restoration and reclamation of mined sites become priority areas of intervention. This review paper deals with history, current status and priorities of forestry research in the area of mine reclamation in India. The foresters need to align their activities in line with the United Nations Decade on Ecosystem Restoration during 2021-2030.

Review on Ferrites and its Application for Environmental Remediation

2021 ◽  
Vol 9 (VII) ◽  
pp. 887-891
Author(s):  
Tooba Jehan
Keyword(s):  
Water Treatment ◽  
Environmental Remediation ◽  
Review Paper ◽  
Current Status ◽  
Energy Devices

During the recent couple of years, there has been an increased level of interest in ferrites. The attractive electrical, optical and different properties of ferrites made them center of attraction because of their utilization in different day to day applications, for example, energy devices like supercapacitors and batteries, water treatment, sun based energy gadgets and attractive liquids. This is the review paper about the ferrites, their current status and development of ferrite technology which is used in various day to day applications.

Experimental study on friction coefficient and temperature rise of heavy-load grease-lubricated spherical plain bearings with surface texture

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jinlong Shen ◽  
Tong Zhang ◽  
Jimin Xu ◽  
Xiaojun LIU ◽  
Kun Liu
Keyword(s):  
Friction Coefficient ◽  
Temperature Rise ◽  
Surface Texture ◽  
Tribological Performance ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Roughness Parameters ◽  
Heavy Load ◽  
Friction Coefficients ◽  
Content Type

Purpose This paper aims to improve the tribological performance of grease-lubricated spherical plain bearings (SPBs) under heavy load, dimple-type textures were prepared by laser on the outer surface of the inner ring. The influence of roughness parameters of a textured surface on reducing friction coefficient and temperature rise was also explored. Design/methodology/approach This study adopts a laser processing method to fabricate dimple-type textures. Three-dimensional roughness parameters were used to characterize the textured surfaces. The friction coefficients of five SPBs with surface texture and one original commercially available SPB without surface texture under different nominal loads were measured on a self-established test rig. The data of temperature rise were obtained by nine embedded thermal couples. Findings The results indicate that SPBs with textures generally exhibit lower friction coefficients than the original SPB without textures. The dimple depth has a significant influence on improving the tribological performance, which coincides with the analysis by surface roughness parameters. A textured surface with negative Ssk and high Vvc has the minimum temperature rise. Originality/value As it is too difficult to arrange sensors into heavy-load SPBs, there are few reports about the temperature characteristics. Through nine embedded thermal couples, the distribution of temperature rise on the inner ring of SPBs was given in this study. The positive effect of surface texture on reducing temperature rise and friction coefficient was verified, which is beneficial for the design of heavy-load SPBs.

Study on Groove Shape of CMP Polishing Pad: A Review

2012 ◽  
Vol 497 ◽  
pp. 278-283 ◽  
Author(s):  
Chun Lan Lou ◽  
Hai Yan Di ◽  
Qiang Fang ◽  
Tao Kong ◽  
Wei Feng Yao ◽  
...  
Keyword(s):  
Research And Development ◽  
Chemical Mechanical Polishing ◽  
Review Paper ◽  
Mechanical Polishing ◽  
Polishing Process ◽  
Critical Elements ◽  
Comprehensive View ◽  
Groove Shape ◽  
Polishing Pad ◽  
Chemical Mechanical Polishing Process

In the chemical mechanical polishing process (CMP) ，the groove shape of polishing pad is one of the most critical elements that directly influences the quality and efficiency of CMP. This review paper describes the basic patterns of groove shape and that the patterns shape of polishing pad how to effect on quality and efficiency of CMP. The effect comparison between various sorts of groove shape and their effects on polishing is described. It is intended to help reader to gain a more comprehensive view on groove shape of polishing pad, and to be instrumental for research and development new groove shape of polishing pad for CMP.

Numerical analysis and optimization of rectangular texture for gas foil thrust bearing

2020 ◽  
Vol 235 (8) ◽  
pp. 1599-1613
Author(s):  
Zhenpeng He ◽  
Chun Zhang ◽  
Jianqiang Li ◽  
Yuanyuan Zhao ◽  
Aijun Sun
Keyword(s):  
Surface Texture ◽  
Texture Parameters ◽  
Lubrication Performance ◽  
Foil Thrust Bearing ◽  
The Stability ◽  
Texture Size ◽  
Rectangular Groove ◽  
Radial Arrangement ◽  
Texture Design ◽  
Oil Film Pressure

Accurate surface texture design is of great significance to improve the performances of gas bearings. In this article, the finite difference method and Newton’s method were combined to obtain the oil film pressure distribution, and the effect of rectangular groove on the lubrication performance was analyzed by changing representative texture parameters. The results show that the performances were more affected by the rectangular texture size compared with the distribution and the bottom shape of texture. The increasing of the surface texture number can only enhance the stability of the bearing. The bearing can provide 30% more bearing capacity by choosing larger size, radial arrangement and plane bottom. These results and analysis can provide technical reference for the bearing texture design.

An Upsetting - Ironing Type Tribo-Meter for Evaluating Tribological Performance of Lubrication Coatings for Cold Forging

2013 ◽  
Vol 535-536 ◽  
pp. 243-246 ◽  
Author(s):  
Masatoshi Hirose ◽  
Zhi Gang Wang ◽  
Shinobu Komiyama
Keyword(s):  
Evaluation Method ◽  
Complex Shape ◽  
Evaluation Methods ◽  
Tribological Performance ◽  
Test Method ◽  
Cold Forging ◽  
Lubrication Performance ◽  
Processing Modes ◽  
Surface Expansion ◽  
The Difference

In recent years, many attempts are being made to develop new lubrication coatings for cold forging. In general, an alternative coating is designed based on the results of the evaluation methods that simulate the frictional condition of cold forging. Various evaluation methods have been proposed and used to design an alternative coating according to the processing purpose. However a lot of parts are manufactured by the multistage forging machine such as parts forming machine, complex shape being produced recently by combined processing. A lubrication coating in such an environment is exposed to repeatedly in a variety of processing modes, and received serious damage. At present the performance of an alternative coating isn’t enough to satisfy needs of market in such a multistep forging. Development of lubricant that can satisfy such demands needs a new evaluation method. This comes the purpose of this study. An newly devised tribometer consists of an ironing process after upsetting process. We designed this test method by using finite element(FE) analysis. In upsetting, damage to the lubrication coating is given by the expansion of free surface. In ironing, the performance of lubrication coating destroyed by upsetting is evaluated. By using the upsetting-ironing type tribometer, the lubrication performance under a large surface expansion and a high pressure can be evaluated. In addition, the degree of coating damage can be adjusted by changing upset ratio and height of billet. The difference in the lubrication performance of the bonderised and the prototype alternative coating was examined by this evaluation method.

scholarly journals REVIEW ON THE DEVELOPMENT OF FUEL CELLS AND ITS FUTURE PROSPECTS

2021 ◽  
Vol 83 (3) ◽  
pp. 75-84
Author(s):  
Thareny Ravichandran ◽  
Juhana Jaafar ◽  
Hamid Ilbeygi ◽  
Mochammad Purwanto
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Fossil Fuels ◽  
Review Paper ◽  
Complete Information ◽  
Current Status ◽  
Future Prospects ◽  
Storage Medium ◽  
Future Direction ◽  
Competing Technologies

Fossil fuels are unsustainable energy storage medium with pollution problems. With the limitation of fossil fuels, fuel cells, which are known as effective electrochemical converters, has attracted much attention. Present review paper provides a complete information on fuel cell technology and history which includes competing technologies, current status of research-and-development and its future direction. Fuel cell plays an important role in stationary applications from 1990s till now due to its efficiency upon reducing emissions.

scholarly journals Enhancing Full-Film Lubrication Performance Via Arbitrary Surface Texture Design

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Yong Hoon Lee ◽  
Jonathon K. Schuh ◽  
Randy H. Ewoldt ◽  
James T. Allison
Keyword(s):  
Surface Texture ◽  
Performance Metrics ◽  
Optimization Problems ◽  
Spline Interpolation ◽  
Load Capacity ◽  
Improve Performance ◽  
Disk Radius ◽  
Lubrication Performance ◽  
Texture Design ◽  
Film Lubrication

Minimizing energy loss and improving system load capacity and compactness are important objectives for fluid power systems. Recent studies reveal that microtextured surfaces can reduce friction in full-film lubrication, and that asymmetric textures can reduce friction and increase normal force simultaneously. As an extension of these previous discoveries, we explore how enhanced texture design can maximize these objectives together. We design surface texture using a set of distinct parameterizations, ranging from simple to complex, to improve performance beyond what is possible for previously investigated texture geometries. Here, we consider a rotational tribo-rheometer configuration with a fixed textured bottom disk and a rotating top flat disk with controlled separation gap. To model Newtonian fluid flow, the Reynolds equation is formulated in cylindrical coordinates and solved using a pseudospectral method. Model assumptions include incompressibility, steady flow, constant viscosity, and a small gap height to disk radius ratio. Multi-objective optimization problems are solved using the epsilon-constraint method along with an interior-point (IP) nonlinear programming algorithm. The trade-off between competing objectives is quantified, revealing mechanisms of performance enhancement. Various geometries are explored and optimized, including symmetric and asymmetric circular dimples, and novel arbitrary continuous texture geometries represented using two-dimensional cubic spline interpolation. Shifting from simple dimpled textures to more general texture geometries resulted in significant simultaneous improvement in both performance metrics for full-film lubrication texture design. An important qualitative result is that textures resembling a spiral blade tend to improve performance for rotating contacts.

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