Wear behaviour ofin situCu–Al₂O₃composites produced by internal oxidation of as cast alloys

Abstract

In the present study, the wear behaviour of Cu-Al 2 O 3 composites and Cu-Al alloys has been investigated. The experiment involved casting of Cu-Al alloys with 0?37, 1, 2 and 3 wt-% of aluminium under inert gas atmosphere. The composites were produced by internal oxidation of alloys at 950uC for 10 h in presence of Fe 2 O 3 and Al 2 O 3 powders mixture. The microstructures of composites were studied using SEM and atomic force microscopy. To identify wear behaviour of specimens, dry sliding pin-on-disk wear tests were conducted according to ASTM G99-95a standard. The normal loads of 20, 30, and 40 N were applied on specimens during wear tests. The sliding speed and distances were selected as 0?5 m s 21 and 500, 1000 and 1500 m respectively. To specify the wear mechanisms, the worn surfaces of composites were examined by SEM equipped with EDX. According to wear test results, increasing applied load and sliding distance leads to more volume loss in all specimens. Composites represent better wear resistance in comparison to alloys. Additionally, increasing the volume fraction of alumina particles in composites enhances the wear resistance, especially under high applied load. The wear mechanisms are mainly abrasion, oxidation and delamination.

Effect of in-situ tribo-oxide-layer on the non-lubricated tribological behaviours of LM27/SiCp composites

“…An increase in microhardness has been observed with the increasing size of ZrSiO 4 but the wear rate also increases with increasing the size of ZrSiO 4 particle [4]. Peterson et al [16] and Purazrang et al [17] investigated the high-temperature solid-lubrication performance of several metal oxides and found that few metal oxides exhibit low friction behaviour at elevated temperatures. Kumar et al [12] investigated the relationship between the oxidation behaviour and tribological performance of the composites at high temperatures showing that the wear performance improved with the decreased particle size.…”

“…Tribological studies of AMCs with different nature, sizes and amounts of reinforcements on various Al-Si alloys are available in the literature [12][13][14][15][16][17][18]. However, the reported research work on the non-lubricated dry sliding wear performance of LM27 alloy with fine and coarse sized SiC P reinforced is limited.…”

Mechanical Activation-Assisted Solid-State Aluminothermic Reduction of CuO Powders for In-Situ Copper Matrix Composite Fabrication

“…Cu-Al 2 O 3 composites are mostly used in electrode materials, especially spot welding [24,[29][30][31][32][33]. These composites are ordinarily prepared by conventional powder metallurgy [34] or casting [35] routes. However, the in-situ reinforced Al 2 O 3 can increase the strength and improve composites' tribological, electrical and thermal properties [36][37][38][39].…”