Optimization of SPS Parameters and Graphene Content with the Aim of Improving Densification and Flexural Strength of ZrB2-SiC Composites: Optimization of SPS Parameters and Graphene Content with the Aim of Improving Densification and Flexural Strength of ZrB2-SiC Composites: Mehdipour, Balak, Azizieh, and Shahedi Asl

Meysam Mehdipour, Zohre Balak*, Mahdi Azizieh, Mehdi Shahedi Asl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study aims to investigate the significance of spark plasma sintering (SPS) variables and the number of graphene nanoplatelets (GNP) on the densification, flexural strength, and microstructure of ZrB2-25 vol.% nano-sized SiC ceramics. Analysis of variance (ANOVA) and Taguchi method were conducted to find the optimal value of selected parameters on three levels. The three-point bending test and Archimedes principles were chosen to calculate flexural strength and relative density, respectively. Scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffractometry (XRD) were employed for the microstructural/phase investigations. Nearly full densification (99.8 ± 0.1%) and the highest flexural strength (610 ± 43 MPa) with 6.4 µm mean grain size were obtained at optimum SPS parameters (1900°C, 6 min holding time, and 20 MPa external pressure) by adding 7.5 wt.% GNP.

Original languageEnglish
JournalJOM
DOIs
Publication statusAccepted/In press - 2024

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