Tribological characterisation of silicon nitride/multilayer graphene nanocomposites produced by HIP and SPS technology. (January 2016)

• Record Type: Journal Article
• Authors: Maros B., Maria; Németh, Alexandra K.; Károly, Zoltán; Bódis, Eszter; Maros, Zsolt; Tapasztó, Orsolya; Balázsi, Katalin
• Is Part Of: Tribology international. Volume 93 Part A(2016)
• Page Start: 269
• Page End: 281
• Publication Date: 2016-01
• Subjects: Silicon nitride composite -- Multilayer graphene -- Spark plasma sintering -- Wear mechanism; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2015.08.041
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Tribological performance of monolithic silicon nitride (Si3 N4 ) and Si3 N4 based composite ceramics containing 1 wt% and 3 wt% multilayer graphene (MLG) sintered by conventional hot isostatic pressing (HIP) and spark plasma sintering (SPS) have been investigated by ball-on-disc tests in dry sliding conditions at two different sliding speeds ( v =20 and 200 mm/s), using SiC and Si3 N4 ball materials, as sliding counterparts to compare the wear behaviour of the differently produced ceramic materials. The wear performance was characterized by the specific wear rate ( k ), wear coefficient ( K ) and friction coefficient ( μ ), completing with the analysis of the wear track morphology and wear mechanisms. SPS composites showed improved wear behaviour that can be explained by the combined effect of SPS on the microstructure and mechanical properties resulting in modification of the controlling wear mechanism of the Si3 N4 /MLG composites. Highlights: Multilayer graphene (MLG) in Si3 N4 ceramics can improve the tribological performance. Structural degradation of HIP produced Si3 N4 /MLG composites can be avoid by SPS. MLG additives modify the wear mechanism in Si3 N4 based ceramics. Si3 N4 /MLG composites have better wear resistance with SiC counterpart vs. Si3 N.