Xiu Ziyang, Ju Boyu, Liu Saiyue, Song Yiwei, Du Jindan, Li Zhimin, Zhou Chang, Yang Wenshu, Wu Gaohui
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2021 Aug 27;14(17):4893. doi: 10.3390/ma14174893.
In this paper, six-layer AlN/Al gradient composites were prepared by a spark plasma sintering process to study the influences of sintering temperature and holding time on the microstructure and mechanical properties. The well-bonded interface enables the composite to exhibit excellent thermal and mechanical properties. The hardness and thermal expansion properties of the composite exhibit a gradient property. The hardness increased with the volume fraction of AlN while the CTE decreased as the volume fraction of AlN. The thermal expansion reaches the lowest value of 13-14 ppm/K, and the hardness reaches the maximum value of 1.25 GPa, when the target volume fraction of AlN is 45%. The simulation results show that this gradient material can effectively reduce the thermal stress caused by the mismatch of the thermal expansion coefficient as a transmitter and receiver (T/R) module. This paper attempts to provide experimental support for the preparation of gradient Al matrix composites.
在本文中，通过放电等离子烧结工艺制备了六层AlN/Al梯度复合材料，以研究烧结温度和保温时间对微观结构和力学性能的影响。良好结合的界面使复合材料具有优异的热性能和力学性能。复合材料的硬度和热膨胀性能呈现梯度特性。硬度随AlN体积分数的增加而增大，而热膨胀系数随AlN体积分数的增加而减小。当AlN的目标体积分数为45%时，热膨胀达到最低值13 - 14 ppm/K，硬度达到最大值1.25 GPa。模拟结果表明，这种梯度材料作为发射和接收（T/R）模块，能够有效降低由热膨胀系数不匹配引起的热应力。本文旨在为梯度Al基复合材料的制备提供实验支持。
