Effect of In on the thermal properties and microstructure of Sn-Bi-Zn alloy#br#

doi:10.12028/j.issn.2095-4239.2017.0054

Abstract

Abstract: The influence of the addition of In on the microstructure and thermal properties of Sn-Bi-Zn eutectic alloy was investigated. The microstructure and phase compositions were investigated by electron probe micro-analysis (EPMA), X-ray diffusion (XRD) and X-ray fluorescence spectroscopy (XRF), and the thermal properties were measured with differential scanning calorimeter (DSC), thermogravimetry (TG/DTA), a pushrod type expansion meter (DIL 402C) and a laser flash analyzer (LFA 457). The results indicated that the microstructure of Sn-Bi-Zn eutectic alloy was mainly composed of Sn-rich phase, Bi-rich phase and Zn-rich phase, but (Sn48Bi50Zn2)100−xInx alloys showed InSn4 and BiIn intermetallic compounds and In-rich phases with increasing In content. The melting enthalpies increased with increasing In content, and the phase change temperature decreased with increasing In content in the (Sn48Bi50Zn2) 100−xInx alloys. The thermal expansion of (Sn48Bi50Zn2) 100−xInx alloys increased with increasing temperature and was tunable between 13×10−6 and 15×10−6/℃ by the In addition. The densities and thermal diffusion coefficient of all the alloys decreased with the addition of In, whereas the thermal conductivity increased with increasing In content.

Key words: heat transfer material, in addition, Sn-Bi-Zn, thermal conductivity

CHENG Xiaomin1,2, WANG Qingmeng1, LI Yuanyuan1, YU Guoming2. Effect of In on the thermal properties and microstructure of Sn-Bi-Zn alloy#br#[J]. Energy Storage Science and Technology, 2017, 6(4): 662-668.

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