High-temperature tribological behavior of Mo and BaF₂ added Cr₃C₂-NiCr matrix composite

Abstract

Purpose

The purpose of this paper is to investigate the tribological performance of Cr₃C₂–NiCr–Mo–BaF₂ composite sliding against a Si₃N₄ ball at high temperatures.

Design/methodology/approach

A Cr₃C₂–NiCr composite and a Cr₃C₂–NiCr–Mo–BaF₂ composite were prepared using spark plasma sintering. Tribological properties of the composites were investigated using a ball-on-disk type tribotester. The relationships among the microstructure, wear mechanism and tribological performance were determined by analyzing the wear track morphologies and the glaze layer’s phase composition.

Findings

The wear rate of the Cr₃C₂–NiCr–Mo–BaF₂ composite was approximately one order of magnitude lower than that of the Cr₃C₂–NiCr composite from 700°C to 900°C when sliding against a Si₃N₄ ball. The favorable tribological performance of the Cr₃C₂–NiCr–Mo–BaF₂ composite at high temperatures results from the synergistic lubrication of MoOx, BaF₂ and BaMoO₄.

Originality/value

This paper reports a new Cr₃C₂–NiCr matrix self-lubricating composite with better tribological properties than Cr₃C₂–NiCr composite at temperatures up to 900°C through Mo and BaF₂ addition.

Citation

Zhao, H., Luo, L., Guo, F., Zhao, X. and Xiao, P. (2020), "High-temperature tribological behavior of Mo and BaF₂ added Cr₃C₂-NiCr matrix composite", Industrial Lubrication and Tribology, Vol. 72 No. 1, pp. 136-145. https://doi.org/10.1108/ILT-03-2019-0075