나노구리合金潤滑劑가 엔진潤滑特性에 미치는 影響

Abstract

The characteristic of a lubricant is important under severe running condition.

Especially on diesel engines the better lubrication performance is required due to the extreme condition such as high temperature and pressure by combustion process in a combustion chamber.

Many research works for improving a boundary lubrication performance have been studied by using solid lubricants, and have been tried to apply solid lubricants to an engine. However those general lubricants like MoS2 or PTFE have not been applied on engines due to the extreme conditions such as very high temperature and pressure by combustion process in a cylinder.

Recently, the solid lubricant containing a copper nickel alloy has been introduced and studied.

In this thesis the lubricant containing the alloy particles is applied on a high speed rolling contact wear test machine and a diesel engine. The lubricant is assessed by mechanical characteristic test and by engine performance test. The results by mechanical characteristic test show the decrease of the coefficient of friction and oil temperature. The results by engine test show the decrease of X-axis and Y-axis amplitude which strongly effect on engine vibration and the decrease of torque related strongly to the engine efficiency as well as the improvement of the engine lubrication performance.

It is clear that the lubricant containing the copper nickel alloy nano-powder decreases friction and wear, and it is also expected the increase of the sealing effect between a cylinder and piston rings.