论文部分内容阅读
采用金属硝酸盐和甘氨酸做前驱体,通过溶胶-凝胶自蔓燃法和超声波辐射合成颗粒尺寸为38nm的Al2ZrO5纳米颗粒。制备过程包括均匀溶胶的形成、凝胶干燥和干燥凝胶的燃烧。在不同温度下,通过搅拌铸造制备Al2ZrO5含量分别为0.75%、1.5%和2.5%(体积分数)的纳米颗粒增强铝基复合材料。通过SEM和XRD对所制得的复合材料进行结构和相分析。通过评估材料的密度、硬度和抗压强度确定最佳的强化相含量和铸造温度。实验结果表明:Al2ZrO5纳米颗粒增强铝基复合材料的硬度和抗压强度得到提升,其最大值分别达到BHN61和900MPa。在850℃下制备的含有1.5%Al2ZrO5的复合材料具有最佳的力学性能。
The metal nitrate and glycine precursors were used to synthesize Al2ZrO5 nanoparticles with particle size of 38nm by sol-gel self-propagating method and ultrasonic irradiation. The preparation process involved the formation of a uniform sol, the gel drying and the burning of the dried gel. At different temperatures, nano-particle reinforced Al matrix composites with Al 2 ZrO 5 content of 0.75%, 1.5% and 2.5% (volume fraction) were prepared by stirring casting. The composites were characterized by SEM and XRD. The best fortified phase content and casting temperature were determined by evaluating the material’s density, hardness and compressive strength. The experimental results show that the hardness and compressive strength of Al2ZrO5 nanoparticle reinforced aluminum matrix composites are improved, and their maximum values reach BHN61 and 900MPa, respectively. The composites with 1.5% Al2ZrO5 prepared at 850 ℃ have the best mechanical properties.