グリセリン及びリン酸骨格構造を有するGDOP添加剤によるa-C:H膜の潤滑油中トライボロジー特性

抄録

In general, GMO (Glycerin Mono-Orate) is one of the effective additive to reduce friction coefficient for DLC (Diamond-Like Carbon). To improve friction coefficient and specific wear rate of DCL, GMO functional group and Dithiol-Phosphate functional group was amalgamated to one additive such as GDTP (Glycerin Dithio-Phosphate). Then, to enhance environmental friendly additive, we tried to replace Surfer to Oxygen such as GDOP (Glycerin DiOxy-Phosphate). To clarify the tribological properties of an a-C:H coating and a SUJ2 ball under boundary lubrication condition at 20, 50 and 80℃, friction tests were conducted in pure PAO (Poly-α-olefin) oil, PAO with each GMO, GDTP and GDOP additives. Under the 80℃ in PAO with GDOP situation, the friction coefficient decreased down to 0.05, then the specific wear rate resulted 1.0× 10-9 mm3/Nm that was the lowest in others. The XPS analysis for a wear scar on the a-C:H revealed the existence of C-OH and phosphate oxide functional group. The analysis result implied that thin tribochemical reaction layer was built on a-C:H surface to prevent wear and reduce friction coefficient.