Hardness and wear behaviour of electroless Ni–B coatings

Balaraju, J.N.; Priyadarshi, Abhinav; Kumar, V. Senthil; Manikandanath, NT; Kumar, P. Praveen; Ravisankar, B.

doi:10.1080/02670836.2015.1137683

Cited by 55 publications

(33 citation statements)

References 31 publications

(76 reference statements)

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“…This could be an indication of higher thermal stability of the deposits [29,39]. High microhardness of heat treated Ni-B and its ternary variants are in accordance with the literature [23][24][25][26][27][28][29].…”

Section: Microhardness Of Nickel Boron and Its Variantssupporting

confidence: 89%

“…Similar results have also been obtained for Ni-B-Mo coatings heat treated at 350 • C, as can be seen in Figure 2. Although, stable Ni 3 B phases are observed along with Ni (111) on heat treating Ni-B-Mo coating at 450 • C for 1 h. Precipitation of hard boride phases on heat treating Ni-B and its variants has been also reported in the literatures [23][24][25][26][27][28][29].The analysis of XRD results is presented in Table 3. The procedure for calculation of absolute integrated intensity of peaks and crystallite size is mentioned elsewhere [13,40].…”

Section: Composition Structure and Surface Morphology Of Nickel Bormentioning

confidence: 73%

“…The elastic modulus of the coatings has a significant effect on the tribological behavior of the coatings. Such observations have been made in recent studies from nano-indentation tests [15,24,40]. It may be obtained from depth of indentation after removal of the indenter [44].…”

Section: Microhardness Of Nickel Boron and Its Variantsmentioning

confidence: 98%

“…Lubricants 2018, 6, 67 2 of 17The Ni-B alloy coating has higher wear resistance and low COF compared with Ni-P alloy [23]. This is attributed to the high hardness, self-lubricating microstructure and columnar growths [24]. Consequently, a reduction in the actual contact area takes place, thereby improving the tribological characteristics [25].…”

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confidence: 99%

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Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

et al. 2018

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Ni-B alloys deposited by the electroless method are considered to be hard variants of the electroless nickel family. Inclusion of Mo or W to form ternary alloys improves the thermal stability of electroless nickel coatings. Therefore, in the present work, Ni-B, Ni-B-Mo, and Ni-B-W coatings are deposited; and their tribological behavior at room and high temperatures are investigated. Electroless Ni-B, Ni-B-Mo, and Ni-B-W coatings are deposited on AISI 1040 steel substrates. The coatings are heat treated to improve their mechanical properties and crystallinity. Tribological behavior of the coatings is determined on a pin-on-disc type tribological test setup using various applied normal loads (10-50 N) and sliding speeds (0.25-0.42 m/s) to measure wear and coefficient of friction at different operating temperatures (25 • C-500 • C). Ni-B-W coatings are observed to have higher wear resistance than Ni-B or Ni-B-Mo coatings throughout the temperature range considered. Although for coefficient of friction, no such trend is observed. The worn surface of the coatings at 500 • C is characterized by lubricious oxide glazes, which lead to enhanced tribological behavior compared with that at 100 • C. A study of the coating characteristics such as composition, phase transformations, surface morphology, and microhardness is also carried out prior to tribological tests. Lubricants 2018, 6, 67 2 of 17The Ni-B alloy coating has higher wear resistance and low COF compared with Ni-P alloy [23]. This is attributed to the high hardness, self-lubricating microstructure and columnar growths [24]. Consequently, a reduction in the actual contact area takes place, thereby improving the tribological characteristics [25]. Suitable treatments of Ni-B coatings may even lead to microhardness that is equivalent to chromium [26]. As a result of this, Ni-B coatings are considered to be a suitable alternative to chromium, which has environmental concerns. Friction and wear characteristics of magnesium and aluminium alloys that are widely used commercially could be improved by Ni-B alloy deposition [27]. An improvement of tribological behavior of Ni-B coatings is also achieved on inclusion of W or Mo [28,29]. In fact, co-deposition of nano Al 2 O 3 results in an increase in microhardness bỹ 290 HV 100 [30]. The mass loss and COF of Ni-B-Al 2 O 3 coatings is almost six and two times lower, respectively, in comparison with Ni-B alloy in as-deposited state. Similar results have been also observed on inclusion of B 4 C nano-particles [31]. Impregnation of Ni-B coatings with PTFE (40%) results in a COF as low as <0.1 in non-lubricated, as well as 3.5% NaCl lubricated sliding condition [32]. Electroless Ni-B coatings have been applied in greaseless guns and barrel bores that are subjected to hostile environments proving to be a suitable replacement to chromium [33]. Recent studies have focused attention on duplex and multi-layer coatings that possess intermediate/enhanced tribological characteristics compared with the single layered binary alloys [34,35]....

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Section: Microhardness Of Nickel Boron and Its Variantssupporting

confidence: 89%

Section: Composition Structure and Surface Morphology Of Nickel Bormentioning

confidence: 73%

Section: Microhardness Of Nickel Boron and Its Variantsmentioning

confidence: 98%

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confidence: 99%

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Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

et al. 2018

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“…The typical cauliflower like surface morphology and columnar growths further aid to the improvement of tribological properties by imparting self-lubricating properties and reducing the actual area of contact. [23][24][25] The wear mechanism and endurance life of Ni-B coatings has been studied extensively by Madah et al 26 Adhesive, abrasive, fatigue, and oxidational wear of the coatings were observed depending on the applied normal load and sliding distance. Phase transformations during the sliding wear process have a significant effect on wear behavior of Ni-B coatings as well as supporting the tribochemical patches.…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of electroless Ni–B–W coating at room and elevated temperatures

Mukhopadhyay

Barman

Sahoo

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Sodium borohydride reduced electroless NiB coatings possess high hardness, wear resistance, and low coefficient of friction. They are found to be suitable candidates for wear reduction of mechanical components. In a quest to achieve enhanced tribological behavior and high thermal stability, the present work reports the inclusion of W to NiB coatings. Electroless method is employed for NiB -W coating deposition on AISI 1040 steel specimens. Post deposition, the coatings are heat treated at 350 C, 400 C, and 450 C. Deposit characterization is carried out using energy-dispersive X-ray analysis, X-ray diffraction, and scanning electron microscopy. Inclusion of W leads to an increase in microhardness and thermal stability of NiB coatings. The tribological behavior of as-deposited and heat-treated NiB -W coatings are investigated at room and elevated temperatures (100 C, 300 C, and 500 C). Heat-treated coatings show lower wear rate at room temperature compared to as-deposited ones but the coefficient of friction increases. Tribological test results at elevated temperatures suggest an improvement in the wear resistance and coefficient of friction at 300 C and 500 C in comparison with 100 C. Phase transformation study post wear test indicate microstructural changes in the coating due to the in situ heat treatment at high temperature. The tribological behavior of the coatings at 100 C and 300 C is mainly governed by the loose wear debris and formation of debris patches, respectively. Whereas at 500 C, formation of protective tribo-oxide patches is also observed.

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Investigation and Optimization of Tribological Behavior of Electroless Ni–B Coating at Elevated Temperatures

Mukhopadhyay

Barman

Sahoo

2019

Lecture Notes on Multidisciplinary Industrial Engineering

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Hardness and wear behaviour of electroless Ni–B coatings

Cited by 55 publications

References 31 publications

Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

Tribological behavior of electroless Ni–B–W coating at room and elevated temperatures

Investigation and Optimization of Tribological Behavior of Electroless Ni–B Coating at Elevated Temperatures

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