Exploring synergistic solid lubrication for enhanced tribological performance in biochar-reinforced aluminum matrix composites fabricated by induction sintering

• Published in: AIP advances 2024-10, Vol.14 (10), p.105302-105302-11
• Main Authors: Abdo, Hany S., Samad, Ubair Abdus, Alnaser, Ibrahim A., Ragab, Sameh A., Fouly, Ahmed
• Format: Article
• Language: English
• Subjects: Aluminum; Aluminum base alloys; Aluminum matrix composites; Bearing strength; Casting; Coefficient of friction; Compressive strength; Demand analysis; Finite element method; Friction; Hardness; Induction sintering; Load carrying capacity; Load resistance; Lubricating properties; Mechanical properties; Surface layers; Tribology; Wear resistance
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/5.0233498

This study presents a pioneering methodology for the synthesis of aluminum matrix composites (AMCs) fortified with biochar, sourced from renewable biomass feedstocks. Employing a systematic approach, various biochar weight percentages were meticulously investigated to discern their impact on the mechanical and tribological properties of the resulting composites. Through a comprehensive battery of tests, encompassing evaluations of compressive strength and hardness, the study elucidated significant enhancements in mechanical robustness consequent to biochar integration. Notably, the mixture formulation with 7.5 wt. % biochar emerged as the optimal configuration, showcasing an impressive 8.83% augmentation in compressive strength and a notable 15% elevation in the hardness relative to the pristine aluminum pure matrix. The research extends beyond traditional analyses, introducing an exploration of tribological performance. The incorporation of biochar is anticipated to impart solid lubricating properties, influencing wear and friction characteristics. Future research directions may delve into the nuanced interplay between biochar content and tribological enhancements, offering insights into the tailored manipulation of mechanical and tribological properties in AMC through biochar reinforcement. The examination of wear and friction exhibited that the friction coefficient decreased by 6.4% when 10 wt. % of biochar was added. Furthermore, the wear resistance improved proportionally with the biochar weight percentage, regardless of the normal loads applied. The finite element model further demonstrated an enhancement in load-carrying capacity due to biochar incorporation. Finally, analysis of the texture of the rubbed surface presented that the inclusion of biochar in an AL matrix changed the way wear occurs and decreased the amount of weight lost during friction. The resulting materials not only exhibit improved mechanical strength but also hold promise for applications in industries that demand robust, environmentally conscious solutions with enhanced tribological performance.