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.

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.

scholarly journals Electrochemical performance of a self-assembled two-dimensional heterostructure of rGO/MoS2/h-BN

2020 ◽  
Vol 2 (4) ◽  
pp. 1531-1541
Author(s):  
Ashwini P. Alegaonkar ◽  
Prashant S. Alegaonkar ◽  
Satish K. Pardeshi
Keyword(s):  
Graphene Oxide ◽  
Performance Evaluation ◽  
Boron Nitride ◽  
Electrochemical Performance ◽  
Hexagonal Boron Nitride ◽  
Two Dimensional ◽  
Molybdenum Disulphide ◽  
Self Assembled

We report the preparation and electrochemical performance evaluation of a two-dimensional (2D) self-assembled heterostructure of graphene oxide (rGO), molybdenum disulphide (MoS2), and hexagonal boron nitride (h-BN).

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

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.

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.

scholarly journals Effect of Hexagonal Boron nitride Nanopowder Reinforcement and Mixing Methods on Physical and Mechanical Properties of Self-Cured PMMA for Dental Applications

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2323 ◽  
Author(s):  
Mana Alqahtani
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Flexural Strength ◽  
Hexagonal Boron Nitride ◽  
Dental Materials ◽  
Physical And Mechanical Properties ◽  
Future Research ◽  
Infrared Spectrometry ◽  
Mixing Method

We report for the first time on the effect of biocompatible hexagonal boron nitride (h-BN) nanopowder reinforcement with different concentrations on the structural and mechanical properties of fabricated self-cured polymethyl methacrylate (PMMA) based dental materials (GC UNIFAST III). A comparison among the structural and mechanical properties between hand and ultrasonic mixing is also presented. Fabricated specimens were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), micro indentation, and flexural strength techniques. The ultrasonic mixing method provides better sample textures of the composite as compared to hand mixing. It is found that XRD and IR intensity of the peaks increases with the increase of h-BN concentration due to nanocomposite formation. The additions of h-BN nanoparticles to the acrylic resin enhanced the hardness and the flexibility values of the composites. Independently of the mixing method used, adding h-BN nanopowder relatively increases the Vickers Hardness numbers (VH) and Flexural Strength (FS) of the unmodified materials. However, using ultrasonic mixing method combined with h-BN nanopowder increases VH numbers to 300% and FS values to 550% with respect to the unmodified sample made by hand mixing. The results obtained are very encouraging and will support future research in vivo, to confirm whether PMMA loaded with h-BN nanoparticles is an improvement compared to current dental restorative materials.

scholarly journals Amphiphilic graphene oxide stabilisation of hexagonal BN and MoS2 sheets

2015 ◽  
Vol 51 (58) ◽  
pp. 11709-11712 ◽  
Author(s):  
M. Haniff Wahid ◽  
Xianjue Chen ◽  
Christopher T. Gibson ◽  
Colin L. Raston
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Molybdenum Disulphide ◽  
Water Dispersible

A simple and scalable method has been developed for directly forming water-dispersible heterolaminar solids involving mixing aqueous solution of amphiphilic graphene oxide with hexagonal boron nitride or molybdenum disulphide in N-methylpyrrolidone.

Effect of Liquid Phase during Sintering on Mechanical and Tribological Properties of Self-Lubricating Composites

2017 ◽  
Vol 899 ◽  
pp. 523-527 ◽  
Author(s):  
Renata Steinbach ◽  
Tatiana Bendo ◽  
G. Hammes ◽  
C. Binder ◽  
J.D.B. de Mello ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Liquid Phase ◽  
Friction Coefficient ◽  
High Performance ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Liquid Phase Sintering ◽  
Mechanical And Tribological Properties ◽  
The Matrix ◽  
Self Lubricating Composites

The present work aimed to contribute to the development of high performance self-lubricating sintered composites, with low friction coefficient and high mechanical strength. Self-lubricating composites presenting embedded solid lubricants in a ferrous matrix were produced. Hexagonal boron nitride (hBN) and graphite were the solid lubricants powders added during the mixing step. The composites were processed by conventional powder metallurgy. The liquid phase sintering, by adding copper, improved the degree of continuity of the matrix by rearranging the solid lubricant particles. With this, besides the hardening effect on the matrix, the mechanical properties of the composites were improved, with tensile strength increasing when compared to the same composite without copper. By using the proposed methodologies, optimized composites presenting friction coefficient of 0.12, tensile strength of 500 MPa and scuffing resistance of 29300 N.m were obtained.

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