Friction and wear behavior of fluoride added Si3N4-SiC ceramic composites at elevated temperature

• Main Authors: Mazumder, Subhrojyoti, Metselaar, Hendrik Simon Cornelis, Sukiman, Nazatul Liana, Zulkifli, Nurin Wahidah Mohd
• Format: Article
• Published: Elsevier 2023
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://eprints.um.edu.my/38457/

The addition of fluoride phases often provides promising wear resistance characteristics in ceramic matrix composites at elevated temperatures. In this work, MgF2 added Si3N4-SiC nanowire composite is successfully fabricated to enhance wear resistance capabilities at 500OC. Tribological characteristics of Si3N4-SiC composite with the addition of fluoride phase are reported here. The composite matrix with 5 wt.% MgF2 shows a signif-icant decrease in coefficient of friction by-25.40% and an improvement of specific wear rate by-78.35%, by providing a tribo layer at the mating interfaces. Moreover, the composite can achieve a high fracture toughness of-10.56 MPa.m0.5 with the addition of SiC nanowires. However, the addition of a higher amount of (>5 wt.%) fluoride diminishes the mechanical properties of the ceramic composite. This leads to a change of wear mech-anism from delamination to abrasion, causing a higher wear rate.