The wear classification of MoDTC-derived particles on silicon and hydrogenated diamond-like carbon at room temperature. (July 2020)

• Record Type: Journal Article
• Authors: Kassim, K.A.M.; Tokoroyama, T.; Murashima, M.; Umehara, N.
• Is Part Of: Tribology international. Volume 147(2020)
• Publication Date: 2020-07
• Subjects: MoDTC -- MoO3 -- Mo2C -- a-C:H DLC -- Si-DLC; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2020.106176
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Molybdenum dithiocarbamate (MoDTC) is well-known as a friction-modifier in engine oil but has wear accelerating effects on DLC/steel sliding contact. Since MoDTC was reported degradable to other materials, the effect of each material on wear acceleration has not been clarified yet. Therefore, it is necessary to divide which Mo-derived compound has a major role to enhance wear. Thus, powder-type MoDTC, MoO3, Mo2 C, MoS2, and Mo were dispersed into Poly-alpha-olefin (PAO), and tested on a-C:H and Si-DLC against steel ball at room temperature. For Mo2 C, MoDTC, and MoO3, the specific wear rate of a-C:H was approximately 3.4 × 10 −5, 3.2 × 10 −6 and 1.5 × 10 −6 mm 3 /Nm, respectively. MoDTC indicated higher affection than MoO3 regardless of the particles' hardness. Si-DLC showed better wear prevention compared to a-C:H. Highlights: MoDTC might have role to accelerate wear of a-C:H by chemical assistance. Mo2 C has 10 times much higher specific wear rate compared to MoDTC. Mo2 C plays a major role to accelerate wear abrasively. The inclusion of Si-doped on a-C:H reduces wear acceleration.