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1 2023

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The effect of graphite flake diameter on the resistance to thermal shock, microstructure and mechanical properties of silicon carbide nanomaterials

Mahmood Mohammed H., Khalaf Wekar M., Azeez Kafel

Journal of Theoretical and Applied Mechanics

2023

Vol. 61 nr 4

783--791

To ascertain the impact of graphite flake diameter on the microstructure and mechani- cal properties as well as resistance to thermal shock, graphite flakes of various diameters have been added to zirconium dibromide (ZrB2) 20 vol.% nano-silicon carbide (SiC) 20 vol.% graphite (ZSnpG) ceramics. The objective of this study is to investigate the effect of graphite flake diameter on silicon carbide nanomaterials. The study aims to identify a strategy for achieving high comprehensive performance of ZrB2-based ceramics incorporating graphite for future research on ultra-high temperature ceramics (UHTCs). The dispersion of mea- surements has been conducted by combining a solid powder with ethanol at various mass fractions. The results demonstrated that, while no changing fracture toughness considerably, the relative density and flexural strength of ZSnpG ceramics initially increased and then de- clined with graphite diameter increasing. The micro-crack length reduction due to residual thermal stress, appearance of silicon carbide nanoparticles within granulation, and manage- ment of graphite distribution all contributed significantly to the improvement of flexural strength ZSnpG ceramics. According to the computed thermal shock parameters, ZSnpG ceramics fracture propagation was constrained by graphite with a larger starting diameter and prevented with a finer starting diameter.