Evaluation of hexagonal boron nitride nano-sheets as a lubricant additive in water
The purpose of this work was to investigate the possible lubricating effects of aqueous dispersions of hexagonal boron nitride (h-BN) nano-sheets. The sheets consisted of 300nm wide and sub-30nm thick flakes, and concentrations containing 1, 0.05 or 0.01wt% were synthesized without surfactants or wi...
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Published in: | Wear 2013-04, Vol.302 (1-2), p.981-986 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The purpose of this work was to investigate the possible lubricating effects of aqueous dispersions of hexagonal boron nitride (h-BN) nano-sheets. The sheets consisted of 300nm wide and sub-30nm thick flakes, and concentrations containing 1, 0.05 or 0.01wt% were synthesized without surfactants or with organic functionalization by means of bath sonication. Optical absorbance data for the h-BN dispersions revealed that nano-sheets remained stably dispersed in water for 30 days. The friction and wear of the clean aqueous dispersions were evaluated using a SiC ball sliding on a disk (Si wafer) arrangement. Results indicated that even small amounts of h-BN nano-sheets could enhance wear resistance and reduce friction coefficient. Also, 30 days after synthesis, the tribological properties of dispersions were not much degraded with time. Tribo-flims were observed to have formed on worn surfaces due to repeated exfoliation and deposition of h-BN nano-sheets during sliding. This process is believed responsible for the tribological improvements from aqueous dispersions. Accordingly, h-BN could be a promising “green” lubricant additive for water. |
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ISSN: | 0043-1648 1873-2577 |
DOI: | 10.1016/j.wear.2012.12.059 |