纳米氧化铝颗粒增强铜-碳基复合材料的磨损性能

Abrasion properties of nano-sized Al_2O_3 particles reinforced Cu-C matrix composites

用MA技术制备了C体积分数为10%的Cu-C固溶体粉体,用溶胶-凝胶(sol-gel)烧结技术制备了平均尺寸为12 nm的γ-Al2O3颗粒和用SPS方法制备了纳米Al2O3颗粒增强Cu-C固溶体基复合材料。采用X射线衍射仪对MA粉体、干凝胶和煅烧粉体进行了物相分析;通过JSM-5500LV型扫描电镜对磨损表面形貌进行观察分析并分析其磨损机制;使用MG-2000型高温摩擦磨损试验机对制备的复合材料进行了干摩擦实验并测定其磨损量。结果表明:纳米氧化铝颗粒体积分数及磨损载荷对复合材料摩擦磨损特性有显著影响,纳米氧化铝的体积分数从0%增加到2%,Cu基复合材料的磨损量从6.2 mg降到2.1 mg。

Cu-10vol%C powder mixture was fabricated by Mechanical Alloy（MA） technology,nano-sized γ-Al2O3 grains（average size 12 nm） were synthesized by sol-gel-sintered technology and nano-sized Al2O3 particles reinforced Cu-C matrix composites were fabricated by Spark Plasma Sintering（SPS） method.The crystalline structure of powders and size of Al2O3 particles were determined by X-ray diffraction.The morphologies of wear surfaces were observed by SEM particles.The dry sliding wear test is carried out on MG-2000 high-temperature wear tester to research tribological properties of composites prepared.The results show that the volume fraction and applied load have significant influence on as-fabricated composites.As the volume fraction of nano-sized Al2O3 particles increases from 0 % to 2 %,the abrasion mass of as-fabricated composites decreases from 6.2 mg to 2.1 mg.