An Experimental Evaluation of Solid Lubricant Based Nanofluids in Small Quantity Cooling and Lubrication during Grinding

2017 ◽  
Vol 890 ◽  
pp. 98-102 ◽  
Author(s):  
Sourabh Paul ◽  
Amitava Ghosh
Keyword(s):  
Boron Nitride ◽  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Metallic Alloys ◽  
Grinding Wheel ◽  
Metal Working ◽  
Maximum Reduction ◽  
Cooling And Lubrication ◽  
Ball On Disc

Small quantity cooling lubrication (SQCL) with commercially available metal working fluids (MWF) and nanofluids has been attempted successfully in machining and grinding. Solid lubricants also provided some benefits in grinding of metallic alloys. However, there are very few studies using molybdenum di-sulphide (MoS2) and hexagonal boron nitride (hBN) dispersed nanofluids applied in SQCL mode in grinding. The aim of the present work is to experimentally study improvement in grinding of EN31 steel using alumina grinding wheel with aqueous MoS2 and hBN nanofluids. The grinding study is supported by detailed tribometry at 1 m/s sliding speed to reveal the possible reasons behind such improvement. MoS2 dispersed nanofluids provided minimum coefficient of friction in ball-on-disc test. It also provided the maximum reduction in specific grinding energy and improvement in surface finish with respect to flood cooling. hBN dispersed nanofluids could not match the performance of MoS2 dispersed nanofluids both in ball-on-disc and grinding experiments.

Automation of calculations of cutting modes taking into account the wear of cubic boron nitride tools when applying solid lubricants

2021 ◽  
pp. 67-70
Author(s):  
Keyword(s):  
Boron Nitride ◽  
High Speed ◽  
Solid Lubricant ◽  
Cubic Boron Nitride ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Ceramic Bond ◽  
Calculation System

The effect of a solid lubricant on the wear of cubic boron nitride grinding wheels on a ceramic bond of different hardness and grain size in the processing of high-speed steel is investigated. The dependences of the change in the wear of cubic boron nitride on the parameters of the processing mode are determined. An automated calculation system is proposed to control the consumption of cubic boron nitride grinding wheels in production conditions. Keywords: solid lubricant, grinding, high speed steel, cubic boron nitride grinding wheel, consumption, wear, grinding mode. [email protected]

Tribological and Corrosion Behavior of HVOF Sprayed Cr3C2-NiCr with Nickel Cladded Graphite and Hexagonal Boron Nitride

2021 ◽  
Author(s):  
M. Oechsner ◽  
T. Engler ◽  
H. Scheerer ◽  
Y. Joung ◽  
K. Bobzin ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Room Temperature ◽  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Wear Behaviour ◽  
Wear Volume ◽  
Coating Microstructure ◽  
Sprayed Coatings

Abstract High-velocity oxyfuel (HVOF) sprayed coatings of Cr3C2-NiCr containing solid lubricants such as nickel cladded graphite and hexagonal boron nitride were successfully developed and characterised with the aim of optimizing their friction and wear behaviour. HVOF technology was used for the integration of solid lubricants to achieve strong cohesion between particles while minimizing thermal decomposition. Coating microstructure and composition were measured and correlated to the results of tribological and corrosion tests. The integration of the solid lubricant greatly reduced friction and wear volume at room temperature, but the lubricating effect was highly dependent on atmosphere and temperature. Cr3C2-NiCr with hBN, however, tends to exhibit more stable wear resistance over a wider temperature range and can be used at temperatures beyond 450 °C.

Grinding Capability of the Indigenous Polymer-Based Solid Lubricant Coating Wheels Used in Dry Grinding

2011 ◽  
Vol 697-698 ◽  
pp. 80-83
Author(s):  
L.Y. Ding ◽  
Hong Hua Su ◽  
H.J. Xu ◽  
M. Fan
Keyword(s):  
Boron Nitride ◽  
Surface Quality ◽  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Grinding Temperature ◽  
Solid Lubricant Coating ◽  
Lubricant Coating ◽  
Dry Grinding

It is essential to control the heat generated in the cutting zone in order to ensure the workpiece quality after grinding. This article deals with an investigation in using graphite and hexagonal boron nitride as solid lubricants to reduce friction and thereby improve the surface integrity of Ti-6Al-4V alloy. The polymer-based solid lubricant coating wheels have been prepared. Grinding experiments have been conducted to study the effect of the graphite and hexagonal boron nitride lubricants on the grinding temperature and the surface quality of the workpiece while grinding Ti-6Al-4V. Results indicate that there is a considerable improvement in the performance of grinding Ti-6Al-4V using graphite and hexagonal boron nitride as solid lubricants in dry grinding in terms of grinding temperature and surface quality of the work piece. The indigenous polymer-based solid lubricant coatings are effective in dry grinding.

Investigation on Microstructure Characteristics and Tribological Properties of Self-Lubricating Metallic Composites Based on Hexagonal Boron Nitride and Molybdenum Disulphide

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Biao Zhao ◽  
Wenfeng Ding ◽  
Guohua Jiang ◽  
Xianying Li ◽  
Jiuhua Xu
Keyword(s):  
Boron Nitride ◽  
Flexural Strength ◽  
Hexagonal Boron Nitride ◽  
Metallic Matrix ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Liquid Phase Sintering ◽  
Molybdenum Disulphide ◽  
Microstructure Characteristics ◽  
Metallic Composites

Abstract In this work, hexagonal boron nitride (hBN)- and molybdenum disulphide (MoS2)-embedded metallic composites were fabricated via liquid-phase sintering. The mechanical property and tribological performance of different samples that contain 5, 7.5, 10, 12.5, and 15 wt% solid lubricants were evaluated. Morphologies, such as micropores and ball and scratch, were characterized after the rotating sliding tests. A high lubricant concentration could adversely affect the flexural strength of as-sintered samples because of the formation and coalescences of micropores. In comparison with MoS2-containing samples under the same lubricant concentrations, the hBN-containing samples exhibited lower flexural strength and density caused by amounts of spherical small and irregular large micropores. Furthermore, the best tribological combination could be achieved in terms of the friction coefficient, wear-rate, and morphologies of balls by applying 7.5 wt% MoS2 particles in the metallic matrix.

scholarly journals TRIBOLOGICAL STUDY OF SELF-LUBRICATING COMPOSITES WITH HEXAGONAL BORON NITRIDE AND GRAPHITE AS SOLID LUBRICANTS

2014 ◽  
Author(s):  
Kelen Juliane Mucelin ◽  
Priscila da Costa Gonçalves ◽  
Gisele Hammes ◽  
Roberto Binder ◽  
Rolf Janssen ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Tribological Study ◽  
Self Lubricating Composites

Sliding Friction Behavior of Sintered Ni-Cr Composites with Solid Lubricants

2021 ◽  
Vol 875 ◽  
pp. 272-279
Author(s):  
Wan Farhana Mohamad ◽  
Amir Azam Khan ◽  
Pierre Barroy ◽  
Olivier Durand-Drouhin ◽  
Clement Puille ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Solid Lubricant ◽  
Sliding Friction ◽  
Solid Lubricants ◽  
Sem Analysis ◽  
Low Friction ◽  
Friction Behavior ◽  
Hardness Tester ◽  
Disc Configuration ◽  
Ball On Disc

High temperature applications of self-lubricated sliding surfaces have gained industrial importance during the recent years. One popular system is based on sintered Ni-Cr composites with addition of solid lubricants. In the present work these composites were prepared under controlled sintering conditions with different combinations of solid lubricants (MoS2, Ag and CaF2) at 1200 °C under flowing argon. The physical properties such as sintered density, relative density and porosity were studied. The microstructures and phase studies of the Ni-Cr based composites were conducted using SEM analysis while the hardness of the composites was measured by Vickers Micro Hardness Tester. The friction tests were conducted with ball on disc configuration following ASTM G-99-95a standard. The MoS2 solid lubricant provides best lubrication at room temperature which is demonstrated by a low friction coefficient compared to pure Ni-Cr composites. The SEM pictures of worn out tracks show solid debris distribution, and filling of pores with solid lubricant phases. The time taken for stabilization of friction coefficient also varies with the type of solid lubricant. Dual and multiple additions of solid lubricants are also able to reduce the friction of coefficient compared to pure Ni-Cr composite.

Development of Fe-P Matrix Composites Containing Embedded Solid Lubricants

2014 ◽  
Vol 802 ◽  
pp. 96-101
Author(s):  
Antonio Itamar Ramos Filho ◽  
Renan Schroeder ◽  
Cristiano Binder ◽  
Aloisio N. Klein
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Alloy Element ◽  
Alpha Phase ◽  
Mechanical Resistance ◽  
The Matrix ◽  
P Matrix

In this work the processing of composites containing graphite or hexagonal boron nitride dispersed in a ferrous matrix alloyed with phosphorous was addressed, with the goal of developing self-lubricating sintered materials with high mechanical resistance. Phosphorous is an alloy element characteristic in powder metallurgy for promoting the formation of liquid phase and alpha phase at high temperature, wherein both phenomena are densification inducers. It is expected therefore with that to rearrange volumetrically the solid lubricant reservoirs, so permitting the composites to present better mechanical properties. In order to understand what really occurs at high temperature, sintering was studied in situ in a dilatometer. Furthermore, microstructural and mechanical properties were carried out to characterize the sintered parts. The main remark was that graphite reacts with the matrix going into solid solution and therefore not being disposed as solid lubricant after sintering. On the other hand, h-BN remains insoluble in the Fe-P matrix and without reducing drastically the strength of the composite.

Effect of hBN Solid Lubricant Concentration on Machinability of Titanium (Ti-6Al-4V) Alloy

2015 ◽  
Vol 830-831 ◽  
pp. 87-90 ◽  
Author(s):  
S. Santosh ◽  
K. Rajkumar ◽  
A. Gnanavelbabu
Keyword(s):  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Sustainable Manufacturing ◽  
Minimum Quantity Lubrication ◽  
Solid Lubricants ◽  
Aerospace Applications ◽  
Dry Conditions ◽  
Cutting Zone ◽  
Cutting Zone Temperature ◽  
Zone Temperature

The prime rationale for designers to choose titanium in their designs for aerospace applications is its relative low weight for a given strength level and its relative resistance to high temperature. Excellent biocompatibility makes titanium as ideal material for many biomedical applications. Even though the titanium products are either sintered or cast into required shape, there is a need for machining in order to produce intricate shapes. However machining of titanium alloys poses many serious problems owing to the reactivity of titanium at high cutting temperatures and rapid tool wear. An alternative method to overcome this is by reducing the cutting zone temperature. This can be achieved by the addition of solid lubricants to regular cutting liquids and using it as minimum quantity lubrication (MQL) strategy. In this study, hexagonal boron nitride (hBN) powder with different concentrations (5, 10, 15 wt %) was mixed with water and used as a lubricant. Turning experiments were performed with TiAlN coated Tungsten carbide insert for a constant speed and variable feed rates. For comparison purpose, machining was carried out under dry conditions. Results indicate that the cutting zone temperature reduced drastically on addition of solid lubricant hBN with water. MQL conditions showed that cutting zone temperature decreased by several folds when compared to dry machining. However there was no significant decrease in temperature between 10 and 15 wt% hBN additions which indicates that 10% hBN addition proves to be optimal. This type of machining thereby paves way for sustainable manufacturing.

Solid Lubricant Nanoparticles as Wear-Reducing Additives in Sheet Metal Forming Fluids

2009 ◽  
Author(s):  
M. Mosleh ◽  
N. D. Atnafu ◽  
J. H. Belk
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Particle Concentration ◽  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Titanium Sheet ◽  
Effective Particle ◽  
Product Surface

Dispersed nanoparticles of solid lubricants in sheet metal forming fluids are studied for enhanced lubrication that can lead to improved product surface quality and reduced tool wear. Molybdenum disulfide (MoS2) and hexagonal boron nitride (hBN) nanoparticles of varying size and concentrations have shown marked reduction in wear of steel counterfaces representing the tool and in scoring of titanium sheet surfaces. The most effective particle concentration and size ranges were 0.25–4% and 70–100 nm. The counterface wear was reduced by 50–75% while the friction coefficient only marginally improved.

Investigation of hBN powder lubricating characteristics of die steel H13–ceramic Si3N4 tribopair at 800 ℃

2019 ◽  
Vol 234 (4) ◽  
pp. 622-631
Author(s):  
Yi Zhang ◽  
Wei Wang ◽  
Zhaowen Hu ◽  
Kun Liu ◽  
Jingjing Chang
Keyword(s):  
Boron Nitride ◽  
High Speed ◽  
Laser Scanning ◽  
Solid Lubricant ◽  
Wear Behavior ◽  
Hexagonal Boron Nitride ◽  
Hot Stamping ◽  
Die Steel ◽  
Lubricating Film ◽  
Short Period

In the background that hot-working die steels have been widely used in the hot stamping process of high strength steels for manufacturing car bodies and parts, solid lubricant materials are promising for decreasing the friction and wear on die surfaces at high temperatures. In this work, hexagonal boron nitride was used to lubricate the sliding interface of ceramic Si3N4 against die steel H13 at 800 ℃, and its frictional behavior was investigated at different contact pressures and rotating speeds by pin-on-disk testing. Tribological characteristics of hexagonal boron nitride solid lubricant were analyzed through 3D laser scanning confocal microscope and energy-dispersive spectroscopy. The results show that the wear behavior of hexagonal boron nitride powder lubricating film featured two stages: gradual undermining and complete damage. The formation-broken dynamic cycle of partial lubricating film constantly occurred at the frictional interface until the film was completely destroyed. In a short period, the hexagonal boron nitride lubricant can reduce the friction coefficient efficiently compared with dry friction, and the die substrate showed basically no abrasion because a layer of plasticity accumulated on the die surface, which protected the substrate. In a certain range, the boundary-lubricating film became damaged rapidly with increasing load, and high speed was not conducive to the stability of the lubricating film.

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