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. 2022 Feb 8;15(3):1252.
doi: 10.3390/ma15031252.

High-Temperature Wear Performance of hBN-Added Ni-W Composites Produced from Combustion-Synthesized Powders

Rahul Kumar  1 , Sofiya Aydinyan  1   2 , Roman Ivanov  1 , Le Liu  1 , Maksim Antonov  1 , Irina Hussainova  1
Affiliations

High-Temperature Wear Performance of hBN-Added Ni-W Composites Produced from Combustion-Synthesized Powders

Rahul Kumar et al. Materials (Basel). .

Abstract

This work reports on the spark plasma sintering (SPS) of self-propagating high-temperature-synthesis (SHS)-derived Ni-W and Ni-W-2wt%hBN (4:1 molar ratio of metals) powders. The synthesis was carried out from a mixture of NiO and WO3 using Mg + C combined reducers through a thermo-kinetic coupling approach. Experiments performed in the thermodynamically optimal area demonstrated the high sensitivity of combustion parameters and product phase composition to the amount of reducers and hBN powder. The powder precursors with and without the addition of hBN were consolidated using SPS at a temperature and pressure of 1300 °C and 50 MPa, respectively, followed by a thorough phase and microstructural characterization of the obtained specimens. SHS-derived powders comprised the nano-sized agglomerates and were characterized by a high sinterability. The specimens of >95% density were subjected to ball-on-plate dry sliding wear tests at a sliding speed of 0.1 ms-1 and a distance of 1000 m utilizing an alumina ball of 10 mm in diameter under a 15 N normal load. The tests were performed at a temperature of 800 °C. A significant improvement in wear behavior was demonstrated for SHS-processed composites in comparison with their counterparts produced via conventional high-energy ball milling technique owing to the phenomena of 'micro-polishing', cyclic 'self-healing' and fatigue. However, the decisive effect of hBN addition in imparting lubrication during an HT wear test was not confirmed.

Keywords: Ni-W; friction; hBN; high temperature; self-propagating high-temperature synthesis; sliding wear; spark plasma sintering.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
A universal tribo-test device (UMT-2) employed for the HT dry unidirectional sliding.
Figure 2
Figure 2
Thermodynamic modeling of the 4NiO-WO3–yMg-xC system (PN2 = 0.4 MPa).
Figure 3
Figure 3
Combustion reaction thermograms of (a) 4NiO-WO3-3.2Mg-3.2C and (b) 4NiO-WO3-3.2Mg-3.2C-2wt%hBN mixtures.
Figure 4
Figure 4
SEM images of powders mixtures of (a) SHS-derived Ni-W, (b) SHS-derived Ni-W-hBN, (c) HEBM Ni-W and (d) HEBM Ni-W-hBN, and XRD results of (e) SHS-derived powders and (f) HEBM powders.
Figure 5
Figure 5
SEM images of SPS-derived composites (a,c) SHS-derived Ni-W, (b,d) SHS-derived Ni-W-hBN and (e) HEBM Ni-W-hBN and XRD results of (f) SHS SPS-derived bulk and (g) HEBM SPS-derived bulks.
Figure 6
Figure 6
Wear rate and CoF of SPS-derived composites. The method of powder preparation is mentioned.
Figure 7
Figure 7
SEM images with two magnifications of worn surfaces of SPS-derived composites (a,b) HEBM Ni-W-hBN, (c,d) SHS-derived Ni-W and (e,f) SHS-derived Ni-W-hBN.
Figure 8
Figure 8
XRD analysis of the wear track of the SPS-derived composites (a) HEBM Ni-W, (b) HEBM Ni-W-hBN, (c) SHS-derived Ni-W and (d) SHSed Ni-W-hBN.
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