Tribology and Lubrication

Chapter 5. This chapter explores the change in rheological properties of non-Newtonian oils as a result of the formation and disintegration of aggregated structures within the fluid that directly influences its flow properties. Such studies are of importance to the oil industry as oil-rich slurries extracted from oil wells contain large amounts of resinous and paraffinic solids and dispersed water that make oil extraction processes labor- and cost-intensive.

unique properties with regard to their tensile strength, Young's modulus and percentage elongation at breaking point, which determines their usage and reliability in maintain-

Interdisciplinary Research Center for Renewable Energy and Power Systems

**Ashim Dutta** Head of R&D,

(IRC-REPS),

India Glycols Limited, Uttarkahand, India

**Hafiz Muhamad Ali** Associate Professor,

Dhahran, Saudi Arabia

Mechanical Engineering Department,

King Fahd University of Petroleum and Minerals,

ing the quality and shelf life of the packed food.

Chapter 6. In recent years, solid lubricants have largely replaced traditional liquid lubricants, as a thin coating of these solid lubricants suffices to design machines that are slim and compact and free from such issues as fluid leakages, loss of liquid through evaporation, and chemical decomposition through overheating. MXenes in particular offer many such advantages and have emerged as a new class of lubricant materials that find many novel applications. In this mini-review, properties of various solid lubricants and their structures are discussed.

Chapter 7. Friction between moving parts is inevitable in high-speed heavy machinery like automobiles and power trains that generate tremendous amounts of heat, and wear and tear of mechanical parts. In all cases, the main design effort for a sustainable long life and uninterrupted performance is focused on lowering friction. Various materials like nitrides, carbides, Zr-Cu, Ti-Cu, Mo-Cu and Al-Cr alloys have been used successfully as solid lubricants. The authors discuss the pros and cons of using these materials and technologies in the design of high-speed power trains.
