Development of self-lubricating composite materials of nickel with molybdenum disulfide, graphite and hexagonal boron nitride processed by powder metallurgy: preliminary study

Parucker, Moisés Luiz; Klein, Aloı́sio Nelmo; Binder, Cristiano; Ristow, Walter W.; Binder, Roberto

doi:10.1590/s1516-14392013005000185

Cited by 25 publications

(12 citation statements)

References 10 publications

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“…Therefore, electric discharge coating is possible and a perfect choice for industrial and research perspectives. Mostly Hexagonal boron nitride (HBN), graphite, molybdenum disulfide etc are used for surface modifications where lubrication effect is required [12,13]. Molybdenum disulfide (MoS 2 ) is a well-known solid lubricant used in industries such as lubricating industries to reduce friction between die and forged material.…”

Section: Introductionmentioning

confidence: 99%

Effect of different currents and compositions of Cu, MoS₂ and HBN on the coating thickness of mild steel substrate using electric discharge coating

Patel¹,

Pradhan²

2022

Mater. Res. Express

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The substrate deposited on the workpiece is used by surface coating for the achievement of various properties in terms of hardness, smoothness, tear or wear etc. But various methods such as electro-plating, conversion coating or several, are less effective because of costly machine involvement, complexity during operation, complexity during work-surface installation, specific (high/low) temperatures and thick coating. To achieve better coating among all, a layer of the modified composite coated surface using Copper (Cu), Molybdenum disulfide (MoS2) and Hexagonal Boron Nitride (HBN) with the help of an Electrical Discharge Machine (EDM) with reverse polarity is formed. In this process, the effect of two variable parameters current and composition (powder mixing ratio) of Cu, MoS2 and HBN with a 50% duty factor on the thickness of the deposited layer is observed. During the deposition process, each green compact electrode is formed by mixing the powdered material in a mortar for approximately 2.5 hours and after processing in a hot press moulding machine. The deposited layer of the coating has also been analyzed using FESEM, XRD and tribological properties, where the highest deposition or thickness of the coating has been achieved at a powder mixing ratio of 20/40/40 to Cu/HBN/MoS2 with a current of 10 A at the same duty factor. Overall, better coating with controllable thickness can be achieved by using EDC, which can be helpful in automobiles or other industries where metal-to-metal friction causes performance loss.

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Section: Introductionmentioning

confidence: 99%

Effect of different currents and compositions of Cu, MoS₂ and HBN on the coating thickness of mild steel substrate using electric discharge coating

Patel¹,

Pradhan²

2022

Mater. Res. Express

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“…Mostly Hexagonal boron nitride, graphite, molybdenum disul de etc. are used for surface modi cations where lubrication effect needed [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Various Process Parameters of EDC on Mild Steel Substrate and their Properties

Patel

Pradhan

2021

Preprint

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In the present study, A layer of the modified composite coated surface is made using Copper, molybdenum disulfide, and hexagonal boron nitride. For this process, Electrical discharge machine (EDM) is used but in reverse polarity. Various factors of the machine influenced the thickness of the deposited layer like the amplitude of peak current, duty factor, powder mixing ratio, used etc. For the deposition process, green compacted electrodes which was made after mixing the powder material in mortar for approximately 2.5 hour and post processing in Hot mount press moulding machine. After that the mixture powder was put in the Hot mounting press machine to made green compact electrode with specific parameters. Experiment was performed on EDM and many analysis were carried out to study the morphology of the coated surface. To get the morphology of the coated layer, FESEM images were examined and found the satisfying uniform distribution of deposited layer constituents with material powder mixing ratio of (Cu/HBN/MoS2) at (20/40/40) got with 50% duty factor and 10 Ampere peak current amplitude. Also done XRD, for the evidence of Cu, MoS2 and HBN.

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“…However, the presence of humidity may decrease the performance of MoS 2 . 7 Graphite exhibits outstanding lubricating properties in a humid atmosphere. 7 Hexagonal boron nitride (h-BN) has been an excellent solid lubricant for high-temperature applications because of its graphite-like lamellar structure.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

et al. 2020

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The present study focused on the development of NiMoAl-based self-lubricating composites using solid lubricants as the second phase by powder metallurgy. For this, Cr2AlC MAX phase, Cr2AlC–Ag, and MoS2 powders were mixed with the NiMoAl-based matrix and subsequently hot pressed to produce bulk composite samples. The average hardness and wear resistance of the matrix were found to be increased with the addition of MoS2, Cr2AlC MAX phase, and Cr2AlC–Ag powder to the NiMoAl matrix. The addition of Cr2AlC to NiMoAl was more effective in improving the wear resistance than MoS2. The addition of Cr2AlC and Cr2AlC–Ag has increased the hardness by about 75% than that with the addition of NiMoAl alloy. A scanning Kelvin probe system was used to study the surface properties of the tribofilm in detail through work function mapping from the edge area to the wear area (groove). Among all the samples, the one with the addition of Cr2AlC–Ag powder to the NiMoAl matrix possesses the best tribo-mechanical properties. Cr2AlC–Ag composite addition to NiMoAl was found to decrease the wear rate by one-third and to reduce the coefficient of friction by one-fourth, compared to the base NiMoAl alloy. This was attributed to the high-sintered density and formation of strong tribofilms consisting of mixed oxides such as Ag2MoO4 and Al2O3, as confirmed by micro Raman spectra.

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Development of self-lubricating composite materials of nickel with molybdenum disulfide, graphite and hexagonal boron nitride processed by powder metallurgy: preliminary study

Cited by 25 publications

References 10 publications

Effect of different currents and compositions of Cu, MoS₂ and HBN on the coating thickness of mild steel substrate using electric discharge coating

Effect of different currents and compositions of Cu, MoS₂ and HBN on the coating thickness of mild steel substrate using electric discharge coating

Effect of Various Process Parameters of EDC on Mild Steel Substrate and their Properties

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

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Development of self-lubricating composite materials of nickel with molybdenum disulfide, graphite and hexagonal boron nitride processed by powder metallurgy: preliminary study

Cited by 25 publications

References 10 publications

Effect of different currents and compositions of Cu, MoS2 and HBN on the coating thickness of mild steel substrate using electric discharge coating

Effect of different currents and compositions of Cu, MoS2 and HBN on the coating thickness of mild steel substrate using electric discharge coating

Effect of Various Process Parameters of EDC on Mild Steel Substrate and their Properties

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

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Product

Resources

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Effect of different currents and compositions of Cu, MoS₂ and HBN on the coating thickness of mild steel substrate using electric discharge coating

Effect of different currents and compositions of Cu, MoS₂ and HBN on the coating thickness of mild steel substrate using electric discharge coating