Sliding wear characteristics of molybdenum containing Stellite 12 coating at elevated temperatures. (November 2015)

• Record Type: Journal Article
• Authors: Motallebzadeh, Amir; Atar, Erdem; Cimenoglu, Huseyin
• Is Part Of: Tribology international. Volume 91(2015)
• Page Start: 40
• Page End: 47
• Publication Date: 2015-11
• Subjects: Sliding -- High temperature -- Wear-resistant -- Raman; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2015.06.006
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The addition of 10 wt% Mo encouraged a eutectic reaction to form Co6 Mo6 C complex carbide and Co3 Mo intermetallic in addition to Cr23 C6 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 °C), the addition of molybdenum provided a remarkable increase in wear resistance in comparison to the lower temperatures (RT and 300 °C), due to the development of a protective oxide film on the worn surface. Highlights: High temperature tribological behavior of PTA deposited Stellite 12 was investigated. 10 wt% Mo addition into Stellite 12 increased the wear resistance. At RT and 300 °C plasticity wear dominated mechanism was operative. At higher temperatures wear progressed by oxidative mechanism. Formation of CoMoO4 on the worn surface remarkably increased wear resistance.