• Tribology and Lubricants
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• v.17 no.5
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• pp.351-357
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• 2001

Tribological behavior of NAO type brake linings containing different volume ratios of graphite and Sb$_2$S$_3$ was investigated using a scale dynamometer. Three different test modes consisting of stop, drag, and fade tests were employed to elucidate the effect of the solid lubricants on brake performance. Results of this work showed that the two solid lubricants, graphite and Sb$_2$S$_3$, significantly affected friction characteristics at various braking situations. Compared with the brake linings containing a single lubricant, the brake linings containing both solid lubricants showed better friction stability due to the synergistic effect of the two disparate lubricants during the stop and the drag test. In particular, in the case of containing two solid lubricants, the brake lining with higher contents of graphite showed better fade resistance than others.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.10b
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• pp.10-17
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• 2003

The amount of production orders from Japanese car and construction machine industries have slightly increased in 2002, but the costs of the forged parts have decreased due to severe competitions with the other Asian countries. Most of the forging industries and some universities are making more efforts for technological researches and developments to meet the demand for higher accuracy and higher quality products, shortening of delivery time, and development of forged parts for new industrial fields. Some helical gears of which surfaces can be net-shaped have been started for commercial base production to be shipped to car industries. Some non-graphite lubricants for hot forging and some conversion coating free lubricants for cold forging have been developed to improve some environmental problems.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2001.06a
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• pp.72-78
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• 2001

An experimental investigation was conducted to examine the tribological behavior of NAO (non-asbestos organic) type brake linings containing different volume ratios of graphite and antimony trisulfide (Sb$_2$S$_3$). In order to investigate the effect of the solid lubricants on brake performance, three different friction tests (pressure, speed, and temperature sensitive tests) were carried out using a scale dynamometer. The test results showed that the friction characteristics were strongly affected by the type and the amount of solid lubricants in the brake lining. It was found that the brake linings with both solid lubricants were better in friction stability due to the complementary role of the two disparate lubricating properties at various pressure and speed conditions. In particular, the brake lining containing higher concentrations of graphite showed better fade resistance than others during high temperature friction test.