Effect of Dual Nanoparticles Reinforcement and Heat Treatment on the Mechanical and Tribological Properties of Cold Sprayed Aluminum Coatings
Abstract
Aluminum-based metal matrix composites (Al-MMCs) have shown enhanced strength, hardness, and wear properties. Hence, Al-MMCs are gaining momentum in the aerospace, automotive, defense and marine industries as a protective wear layer and for battlefield repairs. Recently, Al-MMC coatings were fabricated through cold spray (CS), a form of additive manufacturing (AM). The CS process has shown advantages of minimal oxidation, no phase transformation, and good metallurgical bonding when applied to a substrate. However, drawbacks such as porosity and low ductility limits its practical application. Heat treatments to CS coatings were successful in overcoming the drawbacks but sacrificed hardness for ductility. In a recent study, four variations of Al-MMCs CS coatings were fabricated using nano-sized aluminum and dual ceramic nanoparticle (NP) reinforcements, where the CS feedstock was synthesized through cryo-milling and high-energy ball milling. The study showed that the use of ceramic reinforcements of nano-boron carbide and boron nitride nanoplatelets at various combinations up to 2 vol percent showed improvements in the hardness of the coating. Further research into controlling the properties of NP-reinforced Al-MMC CS coatings can further its application. This study examines the effect of heat treatments and the addition of up to two ceramic nanoparticles on the mechanical and tribological properties of an Al-MMCs coating fabricated by CS.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2022
- Accession Number
- AD1201679
Entities
People
- Kia M. Phua
Organizations
- Naval Postgraduate School