Three-body abrasive wear of hard coatings: Effects of hardness and roughness

Gheisari, Reza; Polycarpou, Andreas A.

doi:10.1016/j.tsf.2018.07.052

Cited by 42 publications

(13 citation statements)

References 38 publications

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“…Figure 7(a)–(e) shows the SEM image of the worn surface of Si 3 N 4 balls at different rotation speeds. It can be seen that at V1 [Figure 7(a)] and V2 [Figure 7(b)], there are free wear debris attached to the surface, and the overall surface is relatively smooth and flat, with obvious friction patterns and traces caused by the wear debris attached to the surface plays an auxiliary role in grinding the upper and lower samples, that is, three-body wear occurs, and three-body wear is a special form of abrasive wear (Reza and Polycarpou, 2018). At V3 [Figure 7(c)], there are many cracks and large pits on the worn surface, and there are obvious grain pull-out traces, which also accord with the characteristics of abrasive wear.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on the effect of load and rotation speed on dry sliding of silicon nitride

Wang

Sun

et al. 2021

ILT

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Purpose The purpose of this study is to investigate the effects of load and rotation speed on dry sliding of silicon nitride, including a series of tribological behaviors (friction coefficient, wear rate, temperature rise, etc.) and wear mechanism. Through the analysis of the above characteristics, the influence law of load and speed on them and the internal relationship between them are determined, and then the best comprehensive performance parameters of silicon nitride full-ceramic spherical plain bearings in dry sliding are predicted, which can provide guidance for the operation condition of silicon nitride full-ceramic spherical plain bearings in dry sliding. Design/methodology/approach The experimental study of different loads and rotation speeds under dry friction conditions was carried out by the using ball-disk sliding test method. Findings With the increase of load, the friction coefficient of silicon nitride friction pair and the wear rate of silicon nitride ball decrease continuously. With the increase of rotation speed, the friction coefficient of silicon nitride friction pair first increases and then decreases, and the wear of silicon nitride ball first increases and then decreases. With the increase of load and rotation speed, the wear mechanism eventually changes to adhesive wear. Originality/value Because of the low timeliness and inefficiency of bearing experiments, this work adopts a simple ball-disk model to comprehensively explore the influence rules of different conditions, which provides a theoretical basis for the subsequent practical application of silicon nitride full-ceramic spherical plain bearings.

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Section: Resultsmentioning

confidence: 99%

Experimental study on the effect of load and rotation speed on dry sliding of silicon nitride

Wang

Sun

et al. 2021

ILT

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“…Values obtained during the observation with the AFM microscope were consistent with the results obtained during the observation with the SEM microscope (Figure 2) and TEM (Figure 3). In the case of hard coatings, low surface roughness reduces the friction coefficient and the wear of the coating [35,36].…”

Section: Analysis Of the Geometric Structure Of The Afm Surfacementioning

confidence: 99%

Characteristics of the Structure, Mechanical, and Tribological Properties of a Mo-Mo2N Nanocomposite Coating Deposited on the Ti6Al4V Alloy by Magnetron Sputtering

et al. 2021

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Mo-Mo2N nanocomposite coating was produced by reactive magnetron sputtering of a molybdenum target, in the atmosphere, of Ar and N2 gases. Coating was deposited on Ti6Al4V titanium alloy. Presented are the results of analysis of the XRD crystal structure, microscopic SEM, TEM and AFM analysis, measurements of hardness, Young’s modulus, and adhesion. Coating consisted of α-Mo phase, constituting the matrix, and γ-Mo2N reinforcing phase, which had columnar structure. The size of crystallite phases averaged 20.4 nm for the Mo phase and 14.1 nm for the Mo2N phase. Increasing nitrogen flow rate leads to the fragmentation of the columnar grains and increased hardness from 22.3 GPa to 27.5 GPa. The resulting coating has a low Young’s modulus of 230 GPa to 240 GPa. Measurements of hardness and Young’s modulus were carried out using the nanoindentation method. Friction coefficient and tribological wear of the coatings were determined with a tribometer, using the multi-cycle oscillation method. Among tested coatings, the lowest friction coefficient was 0.3 and wear coefficient was 10 × 10−16 m3/N∙m. In addition, this coating has an average surface roughness of RMS < 2.4 nm, determined using AFM tests, as well as a good adhesion to the substrate. The dominant wear mechanism of the Mo-Mo2N coatings was abrasive wear and wear by oxidation. The Mo-Mo2N coating produced in this work is a prospective material for the elements of machines and devices operating in dry friction conditions.

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“…Researchers have reported that surface roughness of coating could play an important role in wear behaviour (Sudagar et al 2013, Gheisari & Polycarpou 2018. They found that the wear rate of coating becomes higher if it has higher surface roughness.…”

Section: Wear Behaviormentioning

confidence: 99%

Surface roughness, wear and thermal conductivity of ternary electroless Ni–Ag–P coating on copper substrate

Anasyida

Shiu

2020

Mater. Res. Express

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Thermal testing tool used in electronic industries requires a high thermal conductivity and wear resistant coating to ensure efficient thermal transfer over some period of testing cycles. A study on ternary nickel-silver-phosphorus (Ni-Ag-P) coating was carried out by adding silver sulphate into electroless nickel-phosphorus (Ni-P) bath solution with a target to improve thermal conductivity. The results showed that silver can be co-deposited into Ni-P coating but in limited concentration without causing bath decomposition. Cethyltrimethyl ammonium bromide (CTAB) were added into the bath solution as surfactant to improve the coating surface morphology and roughness. Characterization of coatings were done using atomic force microscope (AFM), scanning electron microscope (SEM), energy dispersive x-ray (EDX), optical microscope, Knoop microhardness tester, pin-on-disc wear tester and hot disk thermal analyser. When the concentration of silver sulphate added was low, coating produced have smoother surface with improved thickness, hardness and wear resistance. Higher concentration of silver sulphate led to bath decomposition thus coatings have rougher surface with reduced thickness, hardness and wear resistance. Thermal conductivity test showed increment in the thermal conductivity value of Ni-P coating from 445.7 W m −1 .K to 466.9 W m −1 .K with addition of 10 mg l −1 silver sulphate. It is found that co-deposition of silver at low concentration can improve the hardness, wear resistance and thermal conductivity, and as comparable thickness value is possible, ternary Ni-Ag-P showed interesting potential to replace current NiP coating used in thermal testing tool.

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Three-body abrasive wear of hard coatings: Effects of hardness and roughness

Cited by 42 publications

References 38 publications

Experimental study on the effect of load and rotation speed on dry sliding of silicon nitride

Experimental study on the effect of load and rotation speed on dry sliding of silicon nitride

Characteristics of the Structure, Mechanical, and Tribological Properties of a Mo-Mo2N Nanocomposite Coating Deposited on the Ti6Al4V Alloy by Magnetron Sputtering

Surface roughness, wear and thermal conductivity of ternary electroless Ni–Ag–P coating on copper substrate

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