Abstract
Mo-Si-B alloy is a promising candidate for high temperature environment, while its high temperature dry sliding wear behavior is not yet well investigated. In the present work, the Mo-12Si-8.5B alloy and its composite reinforced with 10 wt% MoAlB ceramic were prepared by spark plasma sintering. Effects of MoAlB ceramic addition on the microstructure, mechanical properties and dry wear properties at RT-1000 degrees C were investigated. The result indicates that the composite shows an enhanced strength and hardness, and a remarkably improved wear resistance. The excellent wear resistance is mainly attributed to the improved hardness and thermal softening resistance, as well as the formation of Al-2(MoO4)(3) layer at 800-1000 degrees C that results from the dispersive distribution of MoAlB particles.

KeyWords Plus:SI-B ALLOYS; MECHANICAL-PROPERTIES; WEAR PROPERTIES; OXIDATION; MICROSTRUCTURE; COMPOSITE; FRICTION; AL2O3

Published in TRIBOLOGY INTERNATIONAL，Volume 150；10.1016/j.triboint.2020.106344，OCT 2020