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为研究SiC颗粒形貌对SiC_p/Al复合材料热性能的影响,采用水刀对颗粒进行预处理以圆整颗粒的尖角,随后通过挤压浸渗工艺制备了67vol%SiC_p/Al复合材料。同时,采用DEM模型、Kerner模型、Turner模型和2D有限元模型分别对复合材料的导热率、热膨胀性能进行了预测。对比模拟结果和实验结果说明,2D有限元模型的模拟结果与实验结果更为接近;SiC颗粒形貌对本研究复合材料的导热、膨胀性能有直接影响。长径比较小的颗粒有利于热量的均匀扩散,所制备的复合材料具有更高的导热率,同时导热率和热膨胀系数具有各向同性;长径比较大颗粒制备的复合材料由于热量在长度方向和径向的传热具有差异,从而导致其导热率和热膨胀性能具有各向异性。
In order to study the effect of SiC particle morphology on the thermal properties of SiCp / Al composites, the particles were pretreated with a water jet to round the sharp corners of the particles and then 67vol% SiCp / Al composites were prepared by extrusion infiltration process. At the same time, the thermal conductivity and thermal expansion of the composites were predicted by DEM model, Kerner model, Turner model and 2D finite element model respectively. The simulation results and the experimental results show that the simulation results of the 2D finite element model are closer to the experimental ones. The morphology of the SiC particles has a direct influence on the thermal conductivity and expansion performance of the composites. The smaller particles with longer aspect ratio are conducive to the uniform diffusion of heat, the prepared composite material has higher thermal conductivity, and the thermal conductivity and thermal expansion coefficient are isotropic; the composite material with larger diameter and larger particle size has higher thermal conductivity in the length direction And radial heat transfer are different, resulting in its thermal conductivity and thermal expansion anisotropy.