Wear Characterization Of aluminium (Lm25) Met...

Wear Characterization Of aluminium (Lm25) Metal Matrix Composite Reinforced with Sic and Mos2 on Various Heat Treatments

Author Name : S. Venkatraman, R. Ramanathan, A. Mohankumar, M. Vimalkumar

ABSTRACT

In this study, investigates abrasive wear characteristic of the aluminium (LM 25) hybrid metal matrix composite reinforced with SiC and MoS2 by sand casting technique and the test is carried in a micro-abrasion test with the help of various loads. From the study on physical properties and tribological response of Al-SiC composite, the following conclusions are drawn: Addition of  SiC(Silicon carbined) to the aluminium metal matrix increases 25% strength. Increases SiC content (from 10% - 15%) enhances the strength only by above 10%. Beyond15% SiC content, the MMC reduces wear due to its lubricating property. With increasing content of SiC and MoS2, the MMC exhibits enhancement in hardness. The addition of the Molybdenum disulfideincreases the wear resistance. Composites Al-SiC(10% - 15%) with 5% MoS2 exhibits a close variables of coefficient of friction with change in normal load. Among the composites Al-15% SiCp-5% M0S2 composite exhibits least sliding wear. The mixture aluminum matrix composites are heated with different temperatures (350⁰C, 400⁰C, 450⁰C) by aging technique in furnance to examine the wear properties respectively. Presence of partial glazed texture and discrete material pull-out indicating dominant adhesion mode of  wear. Surface roughness of different temperature aged specimens before and after wear characteristic are also seen.

Keywords: Combination of Metal Matrix Composite (CMMC), Sand Casting, Micro Wear Abrasion Tester, Wear Rates, Coefficient of Friction, Surface Roughness (Ra).