Sliding wear characteristics of molybdenum containing Stellite 12 coating at elevated temperatures

Abstract

The addition of 10 wt% Mo encouraged a eutectic reaction to form Co6Mo6C complex carbide and Co3Mo intermetallic in addition to Cr23C6 while causing solid solution hardening of the Co-rich dendritic matrix in the microstructure of the PTA deposited Stellite 12 coating. The addition of molybdenum not only imposed a higher hardness but also enhanced wear resistance. Under oxidation dominated wear conditions (500 and 700 degrees C), the addition of molybdenum provided a remarkable increase in wear resistance in comparison to the lower temperatures (RT and 300 degrees C), due to the development of a protective oxide film on the worn surface. (C) 2015 Elsevier Ltd. All rights reserved.