混料工艺对SiCp/AI复合材料SiC颗粒分布均匀性的影响

采用元素粉末法制备体积分数为12%的SiCp/2024Al复合材料,利用三维高效混料机混料,研究了混料工艺对SiC颗粒在基体中分布均匀性的影响.实验结果表明:球料比、混料时间和颗粒尺寸对SiC颗粒在基体中的分布均匀性有重要影响;球料比1∶2时,由于输入的能量较低,难于实现SiC颗粒在基体中的均匀分布;球料比5∶1时,随着混料时间的延长,SiC颗粒分布均匀性逐渐提高,达到一定时间后不再提高;当球料比5∶1,混料时间20h时,尺寸为3.5μmSiC颗粒在基体中分布均匀性最好,0.8μmSiC颗粒在基体中的分布则存在团聚现象.

Effect of Mixing Processes on SiCp Distribution in SiCp/Al Composites

The 12% SiCp/2024Al (in volume fraction) composite was prepared by mixing the element powder in a 3-D high-efficiency mixer. The effect of mixing process parameters on the spatial distribution of SiC particles were investigated. The experimental results indicated that the ball/charge weight ratio, mixing time and particle size of SiC affect greatly the distribution of SiC in the matrix of the composite. When the ratio is 1:2, it is difficult to achieve the uniform distribution of SiC particles because of low energy input. When the ratio is 5:1, the distribution uniformity of SiC particles is improved gradually with mixing time but cannot be improved much longer at a certain moment. When the ratio is 5:1 with the mixing time 20h, the 3.5μm SiC particles are the best of uniform distribution in matrix, whereas the 0.8μm SiC particles may form conglomerates in matrix.