Jinjin Miao, Jiaqi Liu, Xiao Wu, Han Zou, Dawei Sha, Jie Ren, Yu Dai, Xuehua Yan, Xiaonong Cheng
September 17, 2016
Mn 3 Zn 0.5 Sn 0.5 N/Al composites were successfully prepared by sintering at 623 K and 723 K. It is found that the thermal expansion of Al is effectively decreased with the addition of negative thermal expansion material Mn 3 Zn 0.5 Sn 0.5 N, which plays the role of the thermal expansion compensator in the composite system. The thermal expansion of composites can be tailored by adjusting the volume fraction of Mn 3 Zn 0.5 Sn 0.5 N. In particular, 40 vol.%-Mn 3 Zn 0.5 Sn 0.5 N/Al composite sintered at 723 K has a low thermal expansion coefficient of 2.38×10 −6 K −1 . The thermal expansion of Mn 3 Zn 0.5 Sn 0.5 N/Al composites matches well with those calculated from the rule of mixture (ROM) estimation. The ROM model can be used to predict the thermal expansion of Mn 3 Zn 0.5 Sn 0.5 N/Al composite and design Mn 3 Zn 0.5 Sn 0.5 N/Al composite with a particular thermal expansion. Mn 3 Zn 0.5 Sn 0.5 N/Al composites exhibit excellent electrical conductivities at the level of 10 4 S/cm. The hardness of the as-prepared composites increases by adding Mn 3 Zn 0.5 Sn 0.5 N in Al.