Investigation on the effect of Al addition on synthesis of Ti3SiC2 nanostructure by Mechanical alloying – heat treatment method

Subject Areas : journal of New Materials

نوید Atazadeh ¹ , مینا Saeedi Heydari ² , H.R Baharvandi ³ , ناصر Ehsani ⁴

1 - دانشجوی کارشناسی ارشد، مهندسی مواد مرکب، دانشگاه صنعتی مالک اشتر، تهران، ایران
2 - دانشجوی دکتری، مهندسی مواد و متالورژی، دانشگاه صنعتی مالک اشتر، تهران، ایران
3 - دانشیار، مجتمع موادو فناوری های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران
4 - دانشگاه صنعتی مالک اشتر

Received: 2016-04-04 Accepted : 2018-03-01 Published : 2018-02-20

Keywords: MAX phase, Ti3SiC2, mechanical alloying - heat treatment, molar percent of aluminum,

Abstract :

In this study, the effect of Al addition in synthesis of Ti₃SiC₂ nanostrucure has been studied by mechanical alloying - heat treatment method and using the mixture of Ti, Si, C powders. The composition of 3Ti: 1.3Si: 2C: xAl (x= 0%, 0.5%, 1% and 1.5%) were used in order to evaluate the molar percent of aluminum in synthesis of Ti₃SiC₂ MAX phase. First the initial powders were weighed. Then, the powder mixtures were milled at the ball to powder ratio of 30:1 for 40 hours under argon atmosphere. After that they have been formed in pills under 200 MPa pressure. After the heat treatment of the samples at 1200 °C for 1 hour, an X-ray diffraction analysis was used to examine phase composition while a field emission scattering electron microscope equipped with an EDS spectrometer was utilized to observe the microstructure. The results indicate that the maximum amount of the synthesized Ti₃SiC₂ MAX phase is totally equal to 75wt.%  and it is related to the sample of 3Ti:1.3Si:2C:xAl (x= 1%) which heat treated at the temperature of 1200°C. It was also observed that the weight percentage of the Ti₃SiC₂ MAX phase has decreased in the reaction products by increasing of the molar percent of aluminum from 1 to 1.5 %.

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