Microstructure and mechanical properties of Ti3SiC2 MAX phases sintered by hot pressing

Sheida Haji Amiri; Nasser Pourmohammadie Vafa

doi:10.53063/synsint.2021.1472

Sheida Haji Amiri ¹
Nasser Pourmohammadie Vafa ¹

¹ Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran

https://doi.org/10.53063/synsint.2021.1472

Abstract

This study aimed to investigate the effect of sintering temperature on Ti₃SiC₂ samples' microstructure and mechanical properties, including three-point flexural strength, Vickers hardness, and fracture toughness. Therefore, Ti₃SiC₂ samples were sintered under a vacuum atmosphere at a pressure of 35 MPa for 30 minutes at two temperatures of 1500 and 1550 °C by hot pressing. The microstructure obtained from the fracture cross-section of the samples shows that by increasing the sintering temperature to 1550 °C the microstructure of this sample becomes larger than the sintered sample at 1500 °C. Also, increasing the sintering temperature to 1550 °C causes the decomposition of Ti₃SiC₂ to TiC, which can be seen in the X-ray diffraction pattern (XRD). In addition, the relative density of the sintered sample at 1550 °C is 98.08% which is higher than that of the sintered sample at 1500 °C with the result of 89%. On the other hand, the three-point flexural strength (227.5 MPa), the Vickers hardness (~9 GPa), and the fracture toughness (8.6 MPa.m^1/2) of the sintered sample at 1500 °C are higher due to the fine-grained structure.

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Keywords: MAX phase, Ti3SiC2, Hot pressing, Microstructure, Mechanical properties

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