Influence of Graphite Morphology on Hyperthermal Friction and Wear Behaviors of Aluminum-high Silicon Alloys.

The purpose of this paper is to explore the lubrication of graphite of different morphology in Al-Si alloys, especially at high temperatures.In this work, aluminum-silicon alloys with different graphite particles are prepared by powder metallurgy, and the effect of graphite morphology on friction and wear behaviors are investigated under a hyperthermal environment. The volumetric wear loss results denote that Al-27Si with faked graphite composites perform superior wear resistance than Al-27Si and Al-27Si with particle graphite composites under all test temperatures points. Due to the weak bonding of particle graphite, Al-27Si with particle graphite has the most volume wear loss. When the temperature rises to 400 ℃, the friction coefficient of all the samples has a strong wave with big fluctuation because of aluminum matrix soften and vibration. In this work, to make up for the lack of performance at high temperatures, the Al-27Si alloy was prepared successfully, which makes it possible to evaluate the required performance of the engine. [ABSTRACT FROM AUTHOR]