Al2O3颗粒增强铝基复合材料的耐磨性研究

Study on Wear Resistance of Al_2O_3 Particle Reinforced Al Matrix Composites

以粒度≤74μm的Al2O3为增强相,粒度≤30μm的铝粉为基体,采用粉末冶金法制备了Al2O3颗粒增强铝基复合材料。采用金相显微镜、SEM等分析手段对制备的复合材料进行组织观察,并对其进行耐磨性测试。结果表明,Al2O3含量为10%,烧结温度为660℃,混粉时间为90 min时,相对磨损率最小为0.1684%。随着Al2O3的含量的增加和烧结温度的升高,试样的耐磨性呈现出先升高后降低的趋势,混粉时间对试样的耐磨性影响不明显。

The powder metallurgy technique was used to prepare Al2O3 particle reinforced aluminum matrix composites, with an average particle size of Al2O3 being less than 74μm and the mesh size of aluminium powder being 30 μm. The microstructure of prepared composites was observed by SEM, metallographic microscope analysis, and the wear resistance test was carried out. The results indicate that minimum relative wear rate is 0. 1684% under condition of Al2O3 content of 10% , sintering at 660 ℃ , mixing time of 90 mins,. Wear resistance of the composites increases at first and then drop down significantly with the increase of Al2O3 particles content and sintering temperature, while the influence is not obvious with the increase of mixing times.