EFFECTS OF ANTIFRICTION AND ANTIWEAR ADDITIVES TO COEFFICIENT OF FRICTION AND WEAR SCAR OF GASOLINE AND DIESEL ENGINE LUBRICANTS
Antifriction and antiwear additives commonly used in addition to a mixture of the lubricant in order to improve performance. This study aimed to determine the effect of such additives on changes in the coefficient of friction and the wear scar lubricant to the test object. Testing is done by adapti...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/41056 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Antifriction and antiwear additives commonly used in addition to a mixture of the lubricant in order to improve performance. This study aimed to determine the effect of such additives on changes in the coefficient of friction and the wear scar lubricant to the test object.
Testing is done by adapting the fuel testing standards ASTM D 5001 (BOCLE) (2) and ASTM 6078 (SLBOCLE) (3). Test units were steel balls that rubbed into ball bearings which partially submerged in lubricants and rotating at + 227 rpm and temperature of 40°C, 70°C, and 100°C for 30 min with a load of 3 kg. Lubricants used is gasoline engine lubricant A and diesel engine lubricant B with additives X and Y on a concentration of 5% and 10%. Motor power difference between before and after the load is given were translated as friction power, which by calculations will determine the coefficient of friction. As for the wear scar measurements made using an optical microscope to examine the scar resulting from the tests.
For gasoline engine lubricant A with additional additives proven to reduce the size of the average wear scar diameter of up to 6.8%, while the coefficient of friction testing the resulting data can not be used due to fault test procedures. Surprisingly for diesel engine lubricant B, the addition of additives actually increase the size of the average wear scar diameter of up to 27.8%, while for the magnitude of the coefficient of friction is also experiencing anomalies, for Y additive managed to reduce the coefficient of friction up to 32.7%, but for the X additive actually increases the coefficient of friction up to 26%. From this research it appears that not all additives have a good match for various types of lubricants. |
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