Effect of GNPs content at various compaction pressures and sintering temperatures on the mechanical and electrical properties of hybrid Cu/Al2O3/xGNPs nanocomposites synthesized by high energy ball milling. Issue 11 (1st August 2020)

• Record Type: Journal Article
• Authors: Abu–Okail, Mohamed; Shewakh, W.M.; Brisha, Ayman M.; Abdelraouf, Yasmin A.; Abu-Oqail, Ahmed
• Is Part Of: Ceramics international. Volume 46:Issue 11(2020)Part A
• Page Start: 18037
• Page End: 18045
• Publication Date: 2020-08-01
• Subjects: Hybrid Cu–Al2O3/GNPs nanocomposites -- High energy ball milling -- Mechanical properties -- Electrical resistivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.04.120
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Hybrid nanocomposites can be synthesized by high energy ball milling to form different compositions of Copper (Cu) strengthened with 10% alumina (Al2 O3 ) and x graphene nanoplatelets (GNP) Cu–10%Al2 O3 /x GNPs (x = 0, 0.25, 0.5, 0.75, 1 wt%). Each mixture has been uniaxially compacted at pressures from 300 to 1200 MPa and sintered at three temperatures: 900, 950 and 1000 °C for 2hr. The effect of changing both compaction pressure and sintering temperature values for each mass fraction of the GNPs is investigated on the microstructural, mechanical characteristics, and electrical resistivity of the Cu–10%Al2 O3 /x GNPs hybrid nanocomposites. The results elucidate that the optimum mechanical and physical properties for producing the Cu–10%Al2 O3 /x GNPs nanocomposites are at compaction pressure of 700 MPa and sintering for 2 h at temperature of 1000 °C. Moreover, the addition of 0.5% of GNPs (Cu–10%Al2 O3 /0.5% GNPs) enhances the mechanical properties of the nanocomposites by 68% due to high mechanical properties and the reduction in the particle size of the graphene nanoplatelets. Whereas, increasing GNPs content more than 0.5%, leads to the reduction of the mechanical and physical properties of these composites due to the agglomerations of GNPs on the limits of the grain of Cu and Al2 O3 .