Low-temperature synthesis of Ti 3 Al(Sn)C 2 solid solution using replacement reaction
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Low-temperature synthesis of Ti3Al(Sn)C2 solid solution using replacement reaction Tao Yang1, Qingyun Chen1,*
1 2
, Xuhai Li2,*, Chuanmin Meng2, Bin Ye1, and Binbin Gou1
School of National Defence Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Received: 16 July 2020
ABSTRACT
Accepted: 30 September 2020
The synthesis of Ti3Al(Sn)C2 usually uses elemental powder as the raw material, and the synthesis temperature is up to 1500 °C. Low-temperature ceramic sintering is the key to inhibit the formation of competitive phases and reduce the ceramic sintering cost. In this paper, a new method of low-temperature synthesis of Ti3Al(Sn)C2 was proposed, and high-purity Ti3Al(Sn)C2 sample was successfully prepared at low temperature by using the replacement reaction method. Research shows that the temperature of 600 °C for 5 h is the optimal process conditions for Ti3Al(Sn)C2 synthesis. Furthermore, the introduction of Sn changed the high-temperature oxidation resistance of Ti3AlC2. Compared to pristine Ti3AlC2, the oxidation resistance of Ti3Al(Sn)C2 at 900 °C increases by 33%. The comparative analysis of the formation energy of replacement Ti sites and Al sites shows that the formation energy of Sn-replaced Al sites is lower. These results have broad reference implications for low-temperature synthesis of other MAX phases.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction The MAX phase (Mn?1AXn phase, where n = 1 to 3, M is a transition metal, A is an A-group element and X is C or N) is a class of ternary compounds with a hexagonal structure and nano-layers [1–3]. Because of its high strength, high modulus, high thermal conductivity, high-temperature oxidation resistance, and excellent damage resistance, MAX phase ceramics have potential application value in high-temperature
electrodes, friction and wear components, nuclear energy structural materials, and so on [4–7]. In order to meet the requirements of high-temperature and high-irradiation special environmental conditions, replacement methods are usually used to improve the properties of the MAX phase [8–16]. Tian et al. found that the Vickers hardness of (Cr1-xVx)2AlC (x = 0, 0.1, 0.25, and 0.5) solid solution increased linearly with the increase of the amount of V introduced [9]. Li et al. found that the introduction of magnetic elements (A = Fe, Co, Ni, Mn) in the
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https://doi.org/10.1007/s10854-020-04580-4
J Mater Sci: Mater Electron
monoatomic layer forms a high-entropy MAX phase V2(AxSn1-x)C, which exhibits obvious ferromagnetic behavior [16]. Zheng et al. showed that the introduction of Nb changed the oxidation mechanism of Ti3SiC2 and significantly improved its oxidation resistance [17]. However, there are few reports on the research of Ti3Al(Sn)C2 system.
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