Friction of materials with additions of substances acting as solid lubricants

Shevchuk, Yu. F.; Zozulya, V. D.; Khrienko, A. F.

doi:10.1007/bf00773437

Cited by 8 publications

(2 citation statements)

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“…24 Thermo-mechanical stresses during sliding causes decohesion of oxides from bulk material. 25 Iron oxides are harder (Fe 2 O 3 600 HV; Fe 3 O 4 300 HV) 26 than the test materials (BM 90 HV; composites 68–130 HV). Wear debris, i.e., tribo-oxide debris and delaminated debris abrade pin surfaces increasing wear and also friction (microgrooves, Figure 6).…”

Section: Resultsmentioning

confidence: 98%

High temperature tribological response of Fe-2Cu-0.8C-CaF₂ self-lubricating composites at high speeds

Mohan,

Anand,

Raina

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this work, Fe-2Cu-0.8C-CaF2 self-lubricating composites with calcium fluoride solid lubricant (3 □ 12 wt.%) were examined for their friction and wear at 5 and 10 m/s, at 500 °C. Addition of CaF2 decreased density and hardness of composites. During sliding, materials gained weight due to oxidation. Compared to the base matrix (Fe-2Cu-0.8C), composites showed lower weight gain and lower coefficient of friction. Increase in porosity with CaF2 content increased oxidation resulting in higher weight gain and increased friction due to wear debris abrasion. Increase in speed reduced weight gain due to higher material loss. Adhesion was the dominant wear mechanism in base matrix; delamination and wear debris abrasion in composites. Temperature rise at sliding surfaces was theoretically estimated. Increase in speed increased temperature, which reduced friction due to softening and shearing of solid lubricant. Composite with 3 wt.% CaF2 showed least surface damage and 6 wt.% showed lowest coefficient of friction, i.e., lower by 16% and 10% at 5, 10 m/s than base matrix. Tribological response of the composites to a broad range of applied parameters, viz. speed, load and temperature taken from earlier works and present work is briefly summarized. The study suggests the dominant role of CaF2 content and the wear debris in altering the tribological response. Further, the stability of the developed composites at high temperature and high load conditions was also established. The study suggests that the developed composites could serve high-load and high-temperature applications for heavy machinery such as bearings, shafts and gears.

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Section: Resultsmentioning

confidence: 98%

High temperature tribological response of Fe-2Cu-0.8C-CaF₂ self-lubricating composites at high speeds

Mohan,

Anand,

Raina

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…CaF 2 and BaF 2 have been used as solid lubricants with many metal matrices. Sintered-Fe-based composites incorporating CaF 2 and BaF 2 as solid lubricants have been investigated and CaF 2 has been found to exhibit less friction and wear than BaF 2 (Shevchuk et al, 1968). Zuomin and Childs (2004) investigated the wear resistance of high-speed steels containing CaF 2 , manganese sulphide (MnS) and titanium carbide (TiC).…”

Section: Introductionmentioning

confidence: 99%

Friction and wear behaviour of Fe-Cu-C based self lubricating material with CaF₂as solid lubricant

Sharma

Anand

2017

ILT

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Purpose This paper aims to investigate the effect of CaF2 (calcium fluoride) addition as a solid lubricant on the friction and wear behaviour of sintered Fe-Cu-C materials under different loads. Design/methodology/approach In this study, the effects of CaF2 added in varying weight percentages on the friction-wear properties of Fe-2Cu-0.8C alloys are investigated. Five Fe-2Cu-0.8C-based compositions comprising CaF2 in 0, 3, 6, 9 and 12 Wt.% were prepared using the single-stage compaction and sintering technique. Friction coefficient, wear loss, hardness and compressive strength of the specimens were measured. The worn-out surfaces were analysed using a scanning electron microscope. Friction and wear tests were carried out on pin-on-disc machine under dry sliding conditions at room temperature. Findings The alloy with 3 Wt.% CaF2 was found to be useful in improving wear and friction properties, whereas higher contents of CaF2 resulted in increased wear and friction. Apart from enhanced tribological properties, a slight decrease in the compressive strength was also observed in the 3-Wt.%-CaF2-added sample. Adhesion and abrasion were the prominent wear types observed during this study. Originality/value A new self-lubricating composite is developed where CaF2 is used as a solid lubricant in a Fe-Cu-C-based matrix. CaF2, being a high-temperature lubricant, is tried and tested for friction and wear at room temperature, and the results show that the addition of CaF2 in Fe-Cu-C improved its friction and wear properties. Thus, the developed material can be used for antifriction applications.

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Calcium Fluoride a Potential Solid Lubricant for Green Tribology and Sustainability

Mohan

Anand

Haq

et al. 2020

Lecture Notes in Mechanical Engineering

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Friction of materials with additions of substances acting as solid lubricants

Cited by 8 publications

References 1 publication

High temperature tribological response of Fe-2Cu-0.8C-CaF₂ self-lubricating composites at high speeds

High temperature tribological response of Fe-2Cu-0.8C-CaF₂ self-lubricating composites at high speeds

Friction and wear behaviour of Fe-Cu-C based self lubricating material with CaF₂as solid lubricant

Calcium Fluoride a Potential Solid Lubricant for Green Tribology and Sustainability

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Friction of materials with additions of substances acting as solid lubricants

Cited by 8 publications

References 1 publication

High temperature tribological response of Fe-2Cu-0.8C-CaF2 self-lubricating composites at high speeds

High temperature tribological response of Fe-2Cu-0.8C-CaF2 self-lubricating composites at high speeds

Friction and wear behaviour of Fe-Cu-C based self lubricating material with CaF2as solid lubricant

Calcium Fluoride a Potential Solid Lubricant for Green Tribology and Sustainability

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High temperature tribological response of Fe-2Cu-0.8C-CaF₂ self-lubricating composites at high speeds

High temperature tribological response of Fe-2Cu-0.8C-CaF₂ self-lubricating composites at high speeds

Friction and wear behaviour of Fe-Cu-C based self lubricating material with CaF₂as solid lubricant