Tribological Test of Composites Material Lubricated with Various Solid-Liquid Lubricating System

Nowadays, the use of lubricants in the industrial sector is rapidly increasing, particularly in applications that are subject to high loads and high speeds. Lubricant is a material, generally synthetic, applied to reduce friction between surfaces in reciprocal interaction, which essentially decreases the heat generated by moving surfaces. It may also function as transporting foreign particle or carry any debris to prevent clogging. The solid lubricant is present as a thin film, paste or powder that serves as a friction reducer and also avoids wear on both surfaces in order to reduce the scar on the side. Solid lubricant is a crucial technology for increasing the efficiency of jet and car engines, including engine running at significantly higher temperatures, and for improving the durability of spacecraft. Solid lubricants act as a special application to minimize harm in situations where the use of liquid lubricants is inefficient or insufficient, for example in space technology, automotive or also in vacuum areas. There are a few types of solid lubricants such as transition metal dichalcogenide compounds, carbon-based materials; soft metals and polymers. They can be divided into two specific groups for convenience: soft (hardness < 10 GPa) and hard (hardness > 10 GPa) solid lubricants. Many research has been done in solid-liquid lubricant and mostly of the solid-liquid lubricant is not capable lubricate properly without any modification or additives. In this chapter the different modification, additives and also tribology testing is been reviewed and discussed to get better understanding in solid-liquid lubricants in composite material.