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

Synthesis and Sintering Pub Date : 2021-12-27 DOI:10.53063/synsint.2021.1472

Sheida Haji Amiri, Nasser Pourmohammadie Vafa

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引用次数: 2

Abstract

The Ti3SiC2 used in this project has been purchased ready-made. This study aimed to investigate the effect of sintering temperature on 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 °C 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.m1/2) of the sintered sample at 1500 °C are higher due to the fine-grained structure.

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热压烧结Ti3SiC2 MAX相的组织与力学性能

本项目所使用的Ti3SiC2材料是购买的现成材料。本研究旨在研究烧结温度对试样显微组织和力学性能的影响，包括三点抗弯强度、维氏硬度和断裂韧性。因此，采用热压法在1500℃和1550℃两个温度下，在压力为35 MPa的真空气氛下烧结Ti3SiC2样品30分钟。试样断口断面的显微组织表明，将烧结温度提高到1550℃后，试样的显微组织比1500℃时的烧结试样大。同时，将烧结温度提高到1550℃时，Ti3SiC2分解为TiC，这在x射线衍射图(XRD)中可以看出。1550℃烧结试样的相对密度为98.08%，高于1500℃烧结试样的89%。另一方面，烧结试样在1500℃时的三点抗弯强度(227.5 MPa)、维氏硬度(~9 GPa)和断裂韧性(8.6 MPa.m1/2)均因其细晶组织而提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Synthesis and Sintering

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