Investigation on the tribological behaviour of modified jatropha oil enhanced by hexagonal boron nitride particles as a lubricant additive for machining process
Bio-based oil was recently explored as an alternative solution for petroleum-based oil. This is due to the negative impact of petroleum-based oil to humans and environment. However, few disadvantages make the bio-based oil from crude vegetable oil impractical to be implemented as the industrial lubr...
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| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7387/ |
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| Summary: | Bio-based oil was recently explored as an alternative solution for petroleum-based oil. This is due to the
negative impact of petroleum-based oil to humans and environment. However, few disadvantages make the
bio-based oil from crude vegetable oil impractical to be implemented as the industrial lubricant. In this study,
the crude jatropha oil was chemically modified via transesterification process in order to develop a
machining lubricant so called modified jatropha oil (MJO). Afterward, MJO was blended with micro particle of
hexagonal boron nitride (hBN) as an additive at various percentage ratio compositions. The mixture between
the MJO and additive produces the lubricant sample namely MJ05a. MJ05b and MJ05c. The modification
process was crucially needed to enhance the lubricant properties. The friction and wear measurement were
carried out on the prepared lubricants by using four ball tribotester. An experimental on orthogonal cutting
process was carried out to evaluate the machining performances in terms of cutting force, cutting
temperature, chip thickness and tool chip contact length. All samples were compared with commercially
synthetic ester (SE). The results reveal that the addition of micro particles additive in the MJO outperformed
the SE in terms of friction and wear. Furthermore, the machining performances were significantly related to
the tribological behaviour of the lubricant. The small composition of hBN additive in MJO (MJ05a) showed an
excellent machining performance compared to all lubricants. It was inferred that the Ml05a were able to have
better anti-fiction and anti-wear ability by reducing the machining force and temperature which related to
the formation of smaller chip thickness and tool chip contact length. It shows that MJ05a can be considered as
an effective machining lubricant that provides superior lubrication properties and hibological behaviours
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