The Experts below are selected from a list of 6171 Experts worldwide ranked by ideXlab platform
Suresh Kumar Reddy Narala - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of friction and wear characteristics of electrostatic Solid Lubricant at different sliding conditions
Surface and Coatings Technology, 2017Co-Authors: Rakesh Kumar Gunda, Suresh Kumar Reddy NaralaAbstract:In modern industry, mechanical parts are subjected to friction and wear, leading to heat generation, which affects the reliability, life, and power consumption of machinery. Effective cooling and lubrication in the machining zone are essential to improve friction and temperatures by efficient heat dissipation which increases tool life and surface quality. Solid Lubricant additives have demonstrated better tribological performance in terms of reducing friction and sliding zone temperature without polluting the environment. With an appropriate application of Solid Lubricant additives in the sliding interface, the friction reduction and wear resistance properties of the Lubricant have been successfully improved. Therefore, an attempt has been made in this research work with an investigation of using molybdenum disulphide suspension to reduce the friction at machining zone. To achieve this, in the present work, novel electrostatic charged Solid Lubricant spray technique (ECSL) has been envisaged for effective supply of Solid Lubricant mixture at an extreme low flow rate to the sliding interface of WC pin and Ti–6Al–4V alloy as disc materials. Excessive tribological measurements with SAE 40 oil concentrated with 20 wt% of MoS2with micron size particles results in lower friction coefficient and wear because of the fact that particles with small size were more likely to interact with the sliding surfaces of the friction pairs to form a surface protection film, which increases anti-wear ability of sliding surface. The results indicate that the Solid Lubricants applied effectively with the developed experimental set-up and improve the tribological properties of the sliding surface.
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Tribological studies to analyze the effect of Solid Lubricant particle size on friction and wear behaviour of Ti-6Al-4V alloy
Surface & Coatings Technology, 2016Co-Authors: Rakesh Kumar Gunda, Suresh Kumar Reddy NaralaAbstract:Abstract In modern industry, mechanical parts are subjected to friction and wear, leading to heat generation, which affects the reliability, life and power consumption of machinery. The study of Lubricant film formed between various geometric shapes are inherently complicated and interconnected, making it necessary to understand the concepts of tribological phenomena. To overcome the tribological losses due to friction and wear, use of Lubricants with high viscosities and lower evaporation makes relative motion between two surfaces very smooth. Advancement in modern tribology has facilitated the use of applying Solid Lubricants in various industrial applications. Solid Lubricants in ample thickness can effectively work under extreme conditions of temperature, loads and speeds. The effectiveness of Solid Lubricant particles strongly depends on the type of Lubricant used in the suspension, Solid Lubricant particle size, and as well as concentration. In view of this, the present investigation aims to develop MoS 2 suspension with different weight fractions and to analyze tribological properties in order to make it suitable for most industrial applications. To characterize the same, an experimental setup has been developed to observe and measure the Lubricant film thickness at various particles size and concentrations of Solid Lubricants. To determine Extreme Pressure (EP) properties of applied Solid Lubricants, EP test (ASTM D2783) experiments were performed on a four-ball tester. The results obtained from the experiments show the use of the Solid Lubricant with lesser particle size provide effective thin film thickness in comparison with larger particle size. The results indicate that the optimum particle size and concentration of suspended MoS 2 Solid Lubricants improve the tribological properties with an intended life time of the surfaces.
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measurement and analysis of surface roughness in ws2 Solid Lubricant assisted minimum quantity lubrication mql turning of inconel 718
Procedia CIRP, 2016Co-Authors: Uma Maheshwera Reddy Paturi, Yesu Ratnam Maddu, Ramalinga Reddy Maruri, Suresh Kumar Reddy NaralaAbstract:Abstract The current research work demonstrates through experiment, the effect of Solid Lubricant assisted minimum quantity lubrication (MQL) turning of Inconel 718 on the finish quality of machined surface. In MQL application, micron sized tungsten disulfide (WS2) Solid Lubricant powder particles were dispersed (0.5% wt.) in emulsifier oil based cutting fluid (20:1). To comprehend the finish quality of machined surface with the presence of WS2 Solid Lubricant, turning tests are conducted. The effect of cutting parameters on the finish quality of work surface is evaluated using statistical design approach. Multiple linear regression models are developed and validated to understand the correlations between cutting parameters. Results demonstrate that, surface quality of machined work material during WS2 Solid Lubricant assisted MQL machining showed a much improvement on the finish quality of work material by on average about 35% when compared to MQL machining alone.
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on a novel Solid Lubricant technique a study on the tribological characteristics under dry slide condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2015Co-Authors: Uma Maheshwera Reddy Paturi, Suresh Kumar Reddy NaralaAbstract:The purpose of this study is to investigate the friction and wear behavior of novel electrostatic micro-Solid Lubricant (EMSL) bonded molybdenum disulfide (MoS2) coatings on cemented carbide tools under dry slide condition. Pin-on-disc tribological tests between titanium alloy Ti–6Al–4 V and uncoated/coated cemented tungsten carbide–cobalt alloy (WC–Co) were carried out over a range of experimental domain of sliding speeds and normal loads. Specimen wear rate and friction coefficient were investigated. Tribological tests demonstrate that EMSL bonded MoS2 coatings provide excellent anti-friction and reasonable wear performances. The mechanism of enhanced friction and wear behavior with the MoS2 coatings is discussed. This study explores the feasibility of using EMSL coatings onto tribological components and opens a new way to implement bonded MoS2 Solid Lubricant coatings as a new candidate for tribological operations.
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on a novel Solid Lubricant technique a study on the tribological characteristics under dry slide condition
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2015Co-Authors: Uma Maheshwera Reddy Paturi, Suresh Kumar Reddy NaralaAbstract:The purpose of this study is to investigate the friction and wear behavior of novel electrostatic micro-Solid Lubricant (EMSL) bonded molybdenum disulfide (MoS2) coatings on cemented carbide tools under dry slide condition. Pin-on-disc tribological tests between titanium alloy Ti–6Al–4 V and uncoated/coated cemented tungsten carbide–cobalt alloy (WC–Co) were carried out over a range of experimental domain of sliding speeds and normal loads. Specimen wear rate and friction coefficient were investigated. Tribological tests demonstrate that EMSL bonded MoS2 coatings provide excellent anti-friction and reasonable wear performances. The mechanism of enhanced friction and wear behavior with the MoS2 coatings is discussed. This study explores the feasibility of using EMSL coatings onto tribological components and opens a new way to implement bonded MoS2 Solid Lubricant coatings as a new candidate for tribological operations.
Jun Yang - One of the best experts on this subject based on the ideXlab platform.
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influence of graphite content on the dry sliding behavior of nickel alloy matrix Solid Lubricant composites
Tribology International, 2017Co-Authors: Jinming Zhen, Maohua Li, Zhuhui Qiao, Yi Lu, Jun Cheng, Jun YangAbstract:Abstract Solid Lubricant materials are promising for high performance machines and mechanical systems. In this paper, the nickel alloy matrix Solid Lubricant composites containing Ag, BaF 2 /CaF 2 and three different amounts of graphite were prepared by hot pressed sintering method. The tribotests were performed sliding against Si 3 N 4 ball in air from room temperature to 800 °C. The effect of graphite content on the tribological behavior of the composites under high temperatures was studied. Micro-Raman, XRD and SEM analysis were used to analyze the morphologies and chemical composition of the worn surface and the wear mechanisms were also discussed.
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influence of graphite content on the dry sliding behavior of nickel alloy matrix Solid Lubricant composites
Tribology International, 2017Co-Authors: Jinming Zhen, Maohua Li, Zhuhui Qiao, Yi Lu, Jun Cheng, Jun YangAbstract:Abstract Solid Lubricant materials are promising for high performance machines and mechanical systems. In this paper, the nickel alloy matrix Solid Lubricant composites containing Ag, BaF 2 /CaF 2 and three different amounts of graphite were prepared by hot pressed sintering method. The tribotests were performed sliding against Si 3 N 4 ball in air from room temperature to 800 °C. The effect of graphite content on the tribological behavior of the composites under high temperatures was studied. Micro-Raman, XRD and SEM analysis were used to analyze the morphologies and chemical composition of the worn surface and the wear mechanisms were also discussed.
Jinming Zhen - One of the best experts on this subject based on the ideXlab platform.
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influence of graphite content on the dry sliding behavior of nickel alloy matrix Solid Lubricant composites
Tribology International, 2017Co-Authors: Jinming Zhen, Maohua Li, Zhuhui Qiao, Yi Lu, Jun Cheng, Jun YangAbstract:Abstract Solid Lubricant materials are promising for high performance machines and mechanical systems. In this paper, the nickel alloy matrix Solid Lubricant composites containing Ag, BaF 2 /CaF 2 and three different amounts of graphite were prepared by hot pressed sintering method. The tribotests were performed sliding against Si 3 N 4 ball in air from room temperature to 800 °C. The effect of graphite content on the tribological behavior of the composites under high temperatures was studied. Micro-Raman, XRD and SEM analysis were used to analyze the morphologies and chemical composition of the worn surface and the wear mechanisms were also discussed.
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influence of graphite content on the dry sliding behavior of nickel alloy matrix Solid Lubricant composites
Tribology International, 2017Co-Authors: Jinming Zhen, Maohua Li, Zhuhui Qiao, Yi Lu, Jun Cheng, Jun YangAbstract:Abstract Solid Lubricant materials are promising for high performance machines and mechanical systems. In this paper, the nickel alloy matrix Solid Lubricant composites containing Ag, BaF 2 /CaF 2 and three different amounts of graphite were prepared by hot pressed sintering method. The tribotests were performed sliding against Si 3 N 4 ball in air from room temperature to 800 °C. The effect of graphite content on the tribological behavior of the composites under high temperatures was studied. Micro-Raman, XRD and SEM analysis were used to analyze the morphologies and chemical composition of the worn surface and the wear mechanisms were also discussed.
Rong Meng - One of the best experts on this subject based on the ideXlab platform.
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improving tribological performance of cemented carbides by combining laser surface texturing and w s c Solid Lubricant coating
International Journal of Refractory Metals & Hard Materials, 2018Co-Authors: Rong Meng, Ran Duan, Jianxin Deng, Guiliang ZhangAbstract:Abstract High tool wear is common during the dry machining of austenitic steels with cemented carbide tools. Surface modification is an alternative way to improve tribological performance of cemented carbides. In this paper, microscale textures were made on the surfaces of cemented carbides with a Nd:YAG laser. The W-S-C Solid Lubricant coatings were sequentially deposited on cemented carbide surfaces. Dry sliding tests were performed against austenitic steel balls in the ambient air. The synergic effect of microscale textures and W-S-C Solid Lubricant coatings on the tribological performance of the cemented carbides was studied. Results show that the microscale textured cemented carbides show lower friction than the untextured cemented carbides. The deposited W-S-C Solid Lubricant coatings combined with surface textures with proper groove density are more effective in improving tribological properties than that of textured surfaces. The main mechanism of textures is to capture wear debris in dry sliding condition. In addition, the reserved Lubricant coating between the grooves contributes to the sufficient supply of Lubricant within the contact zone. It is suggested that deposition of W-S-C Solid Lubricant coating on the textured surface is a promising method for improving the friction and wear performance of cemented carbides.
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effect of laser surface textures combined with multi Solid Lubricant coatings on the tribological properties of al2o3 tic ceramic
Wear, 2015Co-Authors: Youqiang Xing, Xingsheng Wang, Jianxin Deng, Rong MengAbstract:Abstract To improve the friction and wear properties of Al 2 O 3 /TiC ceramic tool material, laser surface textures combined with burnished MoS 2 Solid Lubricants, burnished WS 2 Solid Lubricants and magnetron sputtered WS 2 /Zr coatings by physical vapor deposition (PVD) methods were fabricated on its surface. The friction and wear tests were performed by dry sliding friction tests against AISI 1045 hardened steel balls using a ball-on-disk tribometer. The effect of the surface textures combined with muti-Solid Lubricant coatings on the tribological behavior of Al 2 O 3 /TiC ceramic was investigated. Results show that a combination of laser surface textures and Solid Lubricants can effectively improve the tribological properties of Al 2 O 3 /TiC ceramic surface and protect the counter-face of the ball. The burnished WS 2 Solid Lubricants combined with surface textures are more effective in reducing the friction and wear compared with burnished MoS 2 Solid Lubricants. The WS 2 /Zr coatings deposited on the textured sample show the best efficiency in improving the tribological properties compared with the textured samples with burnished MoS 2 and WS 2 Solid Lubricants. However, the ball sliding against the textured sample with burnished WS 2 Lubricants exhibits the smallest wear rate. In addition, the possible mechanisms of laser surface textures combined with different Solid Lubricant types were discussed.
Yi Lu - One of the best experts on this subject based on the ideXlab platform.
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influence of graphite content on the dry sliding behavior of nickel alloy matrix Solid Lubricant composites
Tribology International, 2017Co-Authors: Jinming Zhen, Maohua Li, Zhuhui Qiao, Yi Lu, Jun Cheng, Jun YangAbstract:Abstract Solid Lubricant materials are promising for high performance machines and mechanical systems. In this paper, the nickel alloy matrix Solid Lubricant composites containing Ag, BaF 2 /CaF 2 and three different amounts of graphite were prepared by hot pressed sintering method. The tribotests were performed sliding against Si 3 N 4 ball in air from room temperature to 800 °C. The effect of graphite content on the tribological behavior of the composites under high temperatures was studied. Micro-Raman, XRD and SEM analysis were used to analyze the morphologies and chemical composition of the worn surface and the wear mechanisms were also discussed.
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influence of graphite content on the dry sliding behavior of nickel alloy matrix Solid Lubricant composites
Tribology International, 2017Co-Authors: Jinming Zhen, Maohua Li, Zhuhui Qiao, Yi Lu, Jun Cheng, Jun YangAbstract:Abstract Solid Lubricant materials are promising for high performance machines and mechanical systems. In this paper, the nickel alloy matrix Solid Lubricant composites containing Ag, BaF 2 /CaF 2 and three different amounts of graphite were prepared by hot pressed sintering method. The tribotests were performed sliding against Si 3 N 4 ball in air from room temperature to 800 °C. The effect of graphite content on the tribological behavior of the composites under high temperatures was studied. Micro-Raman, XRD and SEM analysis were used to analyze the morphologies and chemical composition of the worn surface and the wear mechanisms were also discussed.